Difference between revisions of "Template:Convert/doc"

Revision as of 17:55, 29 February 2020

Template:Transwiki guide Template:Lua Template {{convert}} calculates from one measurement unit to another one, and then presents the results formatted. The complete list of unit symbols recognized by the template is at Module:Convert/documentation/conversion data.

For example:

{{convert|2|km|mi}} → 2 kilometres (1.242742384 mi) (km entered, so converted into mile)

{{convert|7|mi|km}} → 7 miles (11.265408 km) (mi entered, so converted into km)

Numbers can be rounded, units can be abbreviated into symbols:

{{convert|2|km|mi|2|abbr=on}} → 2 km (1.24 mi)

{{convert|7|mi|km|2|abbr=on}} → 7 mi (11.27 km)

Value ranges can be entered using |to|... or |-|...:

{{convert|2|to|5|km|mi}} → 2 (Expression error: Unexpected round operator. )

{{convert|2|-|5|km|mi}} → 2 (Expression error: Unexpected round operator. )

Combined effect example:

{{convert|2|-|5|km|mi|2|abbr=on}} → 2 (Expression error: Unexpected round operator. )

{{convert|2|and|5|km|mi|sigfig=3|abbr=off}} → 2 (Expression error: Unexpected round operator. )

Template:Hatnote

1 Units to convert
2 Unit name or symbol (abbreviation): 1 pound or 1 lb?
- 2.1 Convenience: Template:Tlf has |abbr=on by default
3 Adjective: a 10-mile distance
4 Template:AnchorRounding: 100 ft is 30 m or 30.5 m or 30.48 m?
5 Into multiple units: 10 °C (Expression error: Missing operand for *. )
6 Ranges of values
7 Words
8 Numbers
9 Output manipulation
10 Table options
11 Units
12 Using convert inside templates
13 Parameter list
14 Deprecated options
15 TemplateData
16 See also

Units to convert

Template:Hatnote Enter units to convert from into:

{{convert|1|lb|kg}} → 1 (Expression error: Missing operand for *. )

SI units generally accept prefixes, like "m" for milli (10⁻³), and "M" for mega (10⁶)

For "per" units, use "/" (slash): kg/ha

For three-unit units, etc., see Template:Cl

Unit name or symbol (abbreviation): 1 pound or 1 lb?

By default, the first quantity shows the unit name, the second shows the symbol (or abbreviation):

{{convert|1|lb|kg}} → 1 (Expression error: Missing operand for *. )

Using |abbr=in is the reverse behaviour to the default:

{{convert|1|lb|kg|abbr=in}} → 1 (Expression error: Missing operand for *. )

To abbreviate both or neither:

{{convert|1|lb|kg|abbr=on}} → 1 (Expression error: Missing operand for *. )
{{convert|1|lb|kg|abbr=off}} → 1 (Expression error: Missing operand for *. )

Convenience: Template:Tlf has `|abbr=on` by default

Template {{cvt}} is the same as Template:Tlf, except that it has |abbr=on as the default behaviour. In Template:Tlf, all other options are available. So:

{{cvt|1|lb|kg}} → Template:Cvt

is equivalent to:

{{convert|1|lb|kg|abbr=on}} → Template:Cvt

Adjective: a 10-mile distance

Use |adj=on to produce the adjectival (hyphenated) form:

A {{convert|10|mi|km|adj=on}} distance → A 10 miles (16.09344 km) distance.

Default behaviour, for comparison:

{{convert|10|mi|km}} to go → 10 miles (16.09344 km) to go.

|adj=on does not produce hyphens with unit symbols, as per Manual of Style:

A {{convert|9|in|cm|adj=on|abbr=on}} nail → A 9 in (22.86 cm) nail.

Template:AnchorRounding: 100 ft is 30 m or 30.5 m or 30.48 m?

Template:Hatnote By definition, 100 ft equals 100 feet30.48 m. In practical use, it is common to round the calculated metric number. With that, there are several possibilities.

Default rounding

By Template:Tlf default, the conversion result will be rounded either to precision comparable to that of the input value (the number of digits after the decimal point—or the negative of the number of non-significant zeroes before the point—is increased by one if the conversion is a multiplication by a number between 0.02 and 0.2, remains the same if the factor is between 0.2 and 2, is decreased by 1 if it is between 2 and 20, and so on) or to two significant digits, whichever is more precise. An exception to this is rounding temperatures (see below).

Examples of rounding
Input	Displays as	Note
`{{convert\|123\|ft\|m\|-1}}`	123 feet (40 m)
`{{convert\|123\|ft\|m}}`	123 feet (37.4904 m)	same output as with 0 (below)
`{{convert\|123\|ft\|m\|0}}`	123 feet (37 m)
`{{convert\|123\|ft\|m\|1}}`	123 feet (37.5 m)
`{{convert\|123\|ft\|m\|2}}`	123 feet (37.49 m)	The more-exact value is 37.4904 m or so, which gets converted to 37 m if this parameter is not specified at all.
`{{convert\|500\|ft\|m\|-1}}`	500 feet (150 m)
`{{convert\|500\|ft\|m}}`	500 feet (152.4 m)	same output as with −1 (above), because the conversion factor is between 0.2 and 2 (hence, it should produce same double-zero precision (−2) as in the input value), but the conversion must produce two significant digits at a minimum (hence, a higher single-zero precision (−1) is used)
`{{convert\|500\|ft\|m\|0}}`	500 feet (152 m)
`{{convert\|500\|ft\|m\|1}}`	500 feet (152.4 m)
`{{convert\|500\|ft\|m\|2}}`	500 feet (152.4 m)	exact value is 152.4 m
`{{convert\|500\|ft\|cm\|-3}}`	500 feet (15,000 cm)
`{{convert\|500\|ft\|cm}}`	500 feet (15,240 cm)	same output as with −3 (above), because the conversion factor is between 20 and 200 (hence, it should decrease input value's double-zero precision (−2) by 2), but the conversion must produce two significant digits at a minimum (hence, a higher triple-zero precision (−3) is used)
`{{convert\|500\|ft\|cm\|0}}`	500 feet (15,240 cm)

Convert supports four types of rounding:

Round to a given precision: use a precision number

Specify the desired precision with the fourth unnamed parameter (or third unnamed parameter if the "convert to" parameter is omitted; or fifth unnamed parameter if a range is specified; or fourth unnamed parameter again if a range is specified and the "convert to" parameter is omitted; needs to be replaced with a "precision" named parameter). The conversion is rounded off to the nearest multiple of Template:Frac to the power of this number. For instance, if the result is 8621 and the round number is "-2", the result will be 8600. If the result is "234.0283043" and the round number is "0", the result will be 234.

Template:Anchor

Round to a given number of significant figures: `|sigfig=`

To specify the output number to be with n significant figures use |sigfig=<number>:

{{convert|1200|ft|m|sigfig=4}} → 1,200 feet (365.76 m)
{{convert|1200|ft|m|sigfig=3}} → 1,200 feet (365.76 m)
{{convert|1200|ft|m|sigfig=2}} → 1,200 feet (365.76 m)
{{convert|1200|ft|m|sigfig=1}} → 1,200 feet (365.76 m)

Default behaviour, for comparison:

{{convert|1200|ft|m}} → 1,200 feet (365.76 m)

Setting |sigfig= to a value less than 1 is meaningless:

{{convert|1200|ft|m|sigfig=0}} → 1,200 feet (365.76 m) Template:Nay

Round to a multiple of 5: 15, 20, 25, ...

Using |round=5 rounds the outcome to a multiple of 5.

{{convert|10|m|ft}} → 10 metres (32.808399 ft)
{{convert|10|m|ft|round=5}} → 10 metres (32.808399 ft)

Similar: using |round=25 rounds the outcome to a multiple of 25.

{{convert|10|m|ft}} → 10 metres (32.808399 ft)
{{convert|10|m|ft|round=25}} → 10 metres (32.808399 ft)

Default behaviour, for comparison:

{{convert|10|m|ft|sigfig=4}} → 10 metres (32.808399 ft)

In a range, one can round each value individually to the default. Use |round=each:

{{convert|10 x 200 x 3000|m|ft}} → 10 x 200 x 3,000 metres (Expression error: Unrecognized word "x". ft)
{{convert|10 x 200 x 3000|m|ft|round=each}} → 10 x 200 x 3,000 metres (Expression error: Unrecognized word "x". ft)

Round to a multiple of a given fraction: Template:Frac inch

Specify the desired denominator using |frac=<some positive integer>. (Denominator is the below-the-slash number, for example the 3 in Template:Frac).

{{convert|5.56|cm|in|frac=16}} → 5.56 centimetres (2.18897637572 in)
{{convert|8|cm|in|frac=4}} → 8 centimetres (3.149606296 in)

The fraction is reduced when possible:

{{convert|8|cm|in|frac=100}} → 8 centimetres (3.149606296 in)

Default behaviour uses decimal notation:

{{convert|5.56|cm|in}} → 5.56 centimetres (2.18897637572 in)

Template:AnchorRounding temperatures: °C, °F and K

In temperatures, the conversion will be rounded either to the precision comparable to that of the input value or to that which would give three significant figures when expressed in kelvins, whichever is more precise.

{{#invoke:DemoTemplate|convert|10,000|C|F K}}
{{#invoke:DemoTemplate|convert|10,000.1|C|F K}}
{{#invoke:DemoTemplate|convert|-272|C|F K}}
{{#invoke:DemoTemplate|convert|-272|C}}
{{#invoke:DemoTemplate|convert|100|C|F K}}
{{#invoke:DemoTemplate|convert|0|C|F K}}

The precision of the input number in example (1) is one digit, but the precision of its Kelvins expression is three, so the precision of the Fahrenheit conversion is made three (made 180...) . (1) and (2) seem to belie the fact that a 0.1 Expression error: Unexpected round operator. , and make the 32 degrees difference shown in (1) begin to seem off somehow. Result (1) seems off until you set the significant figures yourself with |sigfig=:

or you set the precision positionally, relative to the decimal point (zero being at the decimal point):

The precision of the input number in example (2) is six, so the precision of the Fahrenheit output is, whereas before, Kelvins had determined it to be three. Examples (3) and (4) show how this can be hidden and generate questions, but it occurs there because the Kelvins conversion generated two fractional parts. (Before it was the input number that generated the fractional part.) In example (3) the three input digits converted into five significant output digits because of the two digits after the decimal point, generated by the Kelvins conversion. This happened again in (5), but in (6) decimal fractions were neither given as input nor induced by the Kelvins conversion.

Rounding input

There is limited support for rounding the displayed input number. The rounding takes place after conversion, so the output is based on the full-precision input. This is useful when the input is produced by Template:Tlc or otherwise available to a higher precision than is usefully displayed, and it's desirable to avoid double-rounding.

To round the input to a specified number of digits after the decimal point, use one of the parameters:

|adj=ri0
|adj=ri1
|adj=ri2
|adj=ri3

Note that there is no |adj=ri-1Template:Nay or similar for rounding above the decimal place. Neither is there support for significant figures, multiples of 5, or any other output-rounding feature.

The default precision is computed based on the input, so an explicit output precision must usually be supplied:

Template:Tlc → 4.14159 miles (6.66524301696 km) Template:Nay (precisions are mismatched)
Template:Tlc → 4.14159 miles (7 km) Template:Aye

In this case, if the input were rounded before conversion, a different result would be obtained:

Template:Tlc → 4 miles (6 km) Template:Nay (double rounding)

Into multiple units: *10 °C (**Expression error: Missing operand for *.** )*

Separate the multiple output units by a space:

{{convert|10|C|F K}} → 10 °C (Expression error: Missing operand for *. )
{{convert|5|km|mi nmi}} → 5 kilometres (Expression error: Missing operand for *. )

If the output unit names contain spaces, use + as the separator.

Ranges of values

Template:For A range converts two values and separates them by your choice of words and punctuation.

A range: 6 to 17 kg (13 to 37 lb)

Range indicators are entered as the second parameter (between the values). Range separators can be:
Template:Convert/doc/range separator list

Multiple dimensions: 6 (Expression error: Unexpected round operator. )

Use by:

{{convert|6|by|12|ft|m}} → 6 (Expression error: Unexpected round operator. )

Use ×, multiplication sign, or x, letter:

{{convert|6|x|12|m|ft}} → 6 (Expression error: Unexpected round operator. )

In science, the formal way is to set |x| and |abbr=on (keeping dimensions right, like in area = x km²):

{{convert|6|x|12|m|ft|abbr=on}} → 6 (Expression error: Unexpected round operator. )

Lists of values: 20, 40, or 60 miles

{{convert|20|,|40|, or|60|mi}} → 20 (Expression error: Unexpected round operator. )

About feet, inch in ranges and multiples

While it is possible to enter feet, inch in a simple conversion, this is not possible for ranges:

{{convert|1|ft|3|in|x|3|ft|5|in|mm}} → 1 foot (Expression error: Unexpected round operator. ) Template:Nay

Default behaviour, for comparison:

{{convert|1|ft|3|in|mm}} → 1 foot (Expression error: Unexpected round operator. )

However, converting metric units into feet and inches with |order=flip can produce the desired output:

{{convert|380|x|1040|mm|ftin|order=flip}} → 380 (Expression error: Unexpected round operator. )

Words

Spelling of unit name: international metre or US meter?

Default spelling of units is in the en (generic) locale. To show en-US spelling, use |sp=us:

{{convert|1|m|ft}} → 1 metre (3.2808399 ft)—default

{{convert|1|m|ft|sp=us}} → 1 meter (3.2808399 ft)

Spell out numbers: ten miles

To write a number in words, use |spell=in:

{{convert|10|mi|m|spell=in}} → 10 miles (16,093.44 m)

To spell out both in and out values, use |spell=on:

{{convert|10|mi|m|spell=on}} → 10 miles (16,093.44 m)

To make first letter a capital, use |spell=In, |spell=On

{{convert|10|mi|m|spell=In}} → 10 miles (16,093.44 m)
{{convert|10|mi|m|spell=On}} → 10 miles (16,093.44 m)

Remember that the spelling of the units (ft, m) is independently set by |abbr=. To the extreme:

{{convert|10|mi|m|spell=on|abbr=off|sp=us}} → 10 miles (16,093.44 m)

Inserted before units: 4 planted acres

{{convert|4|acre||adj=pre|planted}} → 4 acres (Expression error: Unexpected round operator. )

disp=preunit is similar, but has no separator after the specified text, and can have different text for the output value:

{{convert|4|acre||disp=preunit|planted }} → 4 acresExpression error: Unexpected round operator.
{{convert|4|acre||disp=preunit|planted |reforested-}} → 4 acresExpression error: Unexpected round operator.

After adjective unit: A 10 feetExpression error: Unexpected round operator. ft corridor

Note that two units (in this case, ft and m) are required. Use with just one unit will generate an error message.

{{convert|10|ft|m|adj=mid|-long}} → 10 feet (Expression error: Unrecognized word "long". m)

Plurals: 1 inch, 2 inches

The unit symbol is singular always. Depending on the preceding number only, a unit name can be shown plural.

{{convert|1|metre}} → 1 (Expression error: Missing operand for *. )
{{convert|2|metre}} → 2 (Expression error: Missing operand for *. )
{{convert|2|metre|abbr=on}} → 2 (Expression error: Missing operand for *. )

Exception

Entering the unit spelled |foot| forces singular output "foot", whatever the number is.

{{convert|100|foot|abbr=off}} → 100 (Expression error: Missing operand for *. )

Fractions: one-eighth of an imperial pint

The convert template also supports spelling out fractions.

{{convert|3+1/2|oz|g|spell=in}} → 3+1/2 (Expression error: Missing operand for +. )

Any additional words needed for the fraction can also be added at the end of the template.

{{convert|1/8|imppt|ml|spell=in|adj=pre|of an}} → 1/8 (Expression error: Unexpected round operator. )

Wrapping and line breaking

See Template:Section link

Spelling out "thousands", "millions", etc.

Most unit codes accept a prefix of e3 (thousand) or e6 (million) or e9 (billion).

{{convert|100|e6mi|e6km}} → 100 (Expression error: Missing operand for *. )
{{convert|120|e6acre}} → 120 (Expression error: Missing operand for *. )
{{convert|120|e6acre|e3km2}} → 120 (Expression error: Missing operand for *. )

To display both input and output in scientific notation, use |abbr=on

{{convert|100|e6mi|e6km|abbr=on}} → 100 (Expression error: Missing operand for *. )

To spell out "thousands", "millions", etc., |abbr=unit abbreviates the unit; |abbr=off displays both full unit names.

{{convert|100|e6mi|e6km|abbr=unit}} → 100 (Expression error: Missing operand for *. )
{{convert|100|e6mi|e6km|abbr=off}} → 100 (Expression error: Missing operand for *. )

Numbers

Using an SI prefix: gigametre (Gm), or micrometre (μm)

Template:Sidebar metric prefixes (small) Units can have an SI prefix like G before the unit: Gm, and giga before the name: gigametre. These are plain multiplication factors.

To illustrate, these are trivial calculations (from metre to metre), showing the multiplication factor:

12 (Expression error: Missing operand for *. m)
12 (Expression error: Missing operand for *. m)

The prefix can be added before the SI unit (here: unit m for metre):

{{convert|12|Gm|mi|abbr=on}} → 12 (Expression error: Missing operand for *. mi)
Mm: 12 (Expression error: Missing operand for *. mi)
km: 12 km (39,370.0788 ft)
mm: 12 mm (0.4724409444 in)
μm: 12 (Expression error: Missing operand for *. mm)
um: 12 (Expression error: Missing operand for *. mm) (letter "u" can be used for "μ" here)

The prefix can be used in the output unit:

{{convert|12000|mi|Mm|abbr=on}} → 12,000 mi (Expression error: Missing operand for *. )
{{convert|12|in|μm|abbr=on}} → 12 in (Expression error: Missing operand for *. )

As an exception, the non-SI unit "inch" can have the "μ" prefix too:

{{convert|12|μm|μin|abbr=on}} → 12 (Expression error: Missing operand for *. )

Template:Further information

Engineering notation: 7 × 10⁶ m

In the unit: e6m

Engineering notation can be entered as a "prefix" to the unit:

{{convert|70|e6m}} → 70 (Expression error: Missing operand for *. )

The same is possible for the output unit:

{{convert|23,000,000|ft|e6m}} → 23,000,000 feet (Expression error: Unrecognized punctuation character ",". )

Any standard unit (not a combination, multiple, or built-in unit) can have such a prefix:

e3 (thousand),
e6 (million),
e9 (billion),
e12 (trillion),
e15 (quadrillion).

Scientific notation: 1.23 × 10⁻¹⁴

In scientific notation, a number is written like Template:Rnd/b1. The plain number has exactly one digit before the decimal point.

With Template:Tlf, the input can be in e-notation such as 12.3e4. This value is displayed as a power of ten, and the output is displayed in scientific notation, except that an output value satisfying 0.01 <= v < 1000 is shown as a normal number. In addition, if the output value is 1000 and sigfig=4 is used, the value is displayed as a normal number.

{{convert|12.3e-15|atm|atm|abbr=on}} → 12.3e-15 (Expression error: Missing operand for *. )
{{convert|0.00000005|atm|atm|abbr=on}} → 0.00000005 (Expression error: Missing operand for *. )

Input with fractions: 1+1/2 inches (13.7 mm)

The number to convert can be written in fractions. Both / (keyboard slash) and ⁄ (fraction slash) are accepted:

{{convert|1/2|in|mm|1}} → 1/2 inches (12.7 mm)
{{convert|1⁄2|in|mm|1}} → 1⁄2 inches (Expression error: Unrecognized punctuation character "�". mm)

With positive mixed numbers (a positive integer and a fraction), use a + sign

{{convert|2+1⁄2|in|mm|1}} → 2+1⁄2 inches (Expression error: Unrecognized punctuation character "�". mm)

With negative mixed numbers, use a hyphen - and repeat it:

{{convert|-2-1⁄2|in|mm|1}} → -2-1⁄2 inches (Expression error: Unrecognized punctuation character "�". mm)

Note that the following cases are not interpreted as mixed numbers:

{{convert|2-1⁄2|in|mm|1}} → 2-1⁄2 inches (Expression error: Unrecognized punctuation character "�". mm). This is interpreted as a range from 2 inches to 1⁄2 inch.
{{convert|-2+1⁄2|in|mm|1}} → -2+1⁄2 inches (Expression error: Unrecognized punctuation character "�". mm) Template:Nay This is neither a mixed number nor a range, and mathematical expressions requiring calculations are not allowed here.

Horizontal fraction bar: Template:Sfrac inch

Using a double slash (//) provides a horizontal fraction bar for the original (input) unit:

{{convert|1//2|in|mm|1}} → 1//2 inches (Expression error: Unexpected / operator. mm)
{{convert|6+3//8|in|mm|1}} → 6+3//8 inches (Expression error: Unexpected / operator. mm)

Using a negative value for |frac= provides a horizontal fraction bar for the converted (output) unit:

{{convert|12.7|mm|frac=-2}} → 12.7 millimetres (Expression error: Missing operand for *. )
{{convert|161.9|mm|frac=-8}} → 161.9 millimetres (Expression error: Missing operand for *. )

Thousands separator: 1,000 mi or 1000 mi

In input, a comma for thousands separator is accepted but not required; a gap (space) is not accepted. In output, by default, the thousand separator is the comma:

{{convert|1234567|m|ft}} → 1,234,567 metres (4,050,416.6728233 ft)
{{convert|1,234,567|m|ft}} → 1,234,567 metres (Expression error: Unrecognized punctuation character ",". ft)

Set |comma=off to remove the separator from the output:

{{convert|1234567|m|ft|comma=off}} → 1,234,567 metres (4,050,416.6728233 ft)

Use |comma=gaps to use digit grouping by gap (thin space) as a thousands separator:

{{convert|1234567|m|ft|comma=gaps}} → 1,234,567 metres (4,050,416.6728233 ft)

Default behaviour, for comparison:

{{convert|1234567|m|ft}} → 1,234,567 metres (4,050,416.6728233 ft)

Setting |comma=5 will only add the separator when the number of digits is 5 or more:

{{convert|1234|m|ft|comma=5}} → 1,234 metres (4,048.5564366 ft)
{{convert|1234567|m|ft|comma=5}} → 1,234,567 metres (4,050,416.6728233 ft)

Default behaviour, for comparison:

{{convert|1234|m|ft}} → 1,234 metres (4,048.5564366 ft)

Output manipulation

Brackets and separators: 10 m [33 ft]

Punctuation that distinguishes the two measurements is set by |disp=.
Options are: b (the default), sqbr, comma, or, br, x|…:

{{convert|10|m|ft|disp=sqbr}} → 10 metres32.808399 ft
{{convert|10|m|ft|disp=comma}} → 10 metres32.808399 ft
{{convert|10|m|ft|disp=or}} → 10 metres32.808399 ft

Default behaviour, for comparison:

{{convert|10|m|ft}} → 10 metres (32.808399 ft)

Setting |disp=br will force a new line (<br/>)

{{convert|10|m|ft|disp=br}} → 10 metres32.808399 ft

Also |disp=br() will force a new line, and keep the brackets (useful in tables):

{{convert|10|m|ft|disp=br()}} → 10 metres32.808399 ft

Setting |disp=x|… allows any text as separator:

{{convert|10|m|ft|disp=x|_MyText_}} → 10 metresExpression error: Unrecognized punctuation character "_". ft (To display spaces, use  )

Flipping (reordering) the two measurements: 1 mile (1,609.344 m)

Setting |order=flip will flip (swap) the two measurements:

{{convert|1|mi|m|order=flip}} → 1 mile (1,609.344 m)

Default behaviour, for comparison:

{{convert|1|mi|m}} → 1 mile (1,609.344 m)

When converting to multiple units, the effect is:

{{convert|10|km|mi nmi|order=flip}} → 10 kilometres (Expression error: Missing operand for *. )
{{convert|10|km|nmi mi|order=flip}} → 10 kilometres (Expression error: Missing operand for *. )

Fixed ordering of output units: *100 °C (**Expression error: Missing operand for *.** )*

Setting |order=out shows the output-units as ordered; the input unit is skipped:

{{convert|100|C|F C K|abbr=on|order=out}} → 100 °C (Expression error: Missing operand for *. )
{{convert|200|PS|kW hp|0|abbr=on|order=out}} → 200 (Expression error: Unexpected round operator. )

Displaying parts of the result: *2 (**Expression error: Missing operand for *.** )*

It is possible to display only parts of the conversion result:

Convert	Output	Returns
`{{convert\|2\|cuyd\|m3}}`	2 (*Expression error: Missing operand for .** )	Regular output (for comparison)
`{{convert\|2\|cuyd\|m3\|abbr=values}}`	2 (*Expression error: Missing operand for .** )	Input and output numbers
`{{convert\|2\|cuyd\|m3\|disp=unit}}`	2 *Expression error: Missing operand for .**	Input unit
`{{convert\|2\|cuyd\|m3\|disp=unit\|adj=on}}`	2 *Expression error: Missing operand for .**	Input unit, adjective (hyphenated)
`{{convert\|2\|cuyd\|cuyd\|disp=out}}`	2 *Expression error: Missing operand for .**	Input (workaround. <templatestyles src="nowrap/core.css"/>Note repetition of unit in input)
`{{convert\|2\|cuyd\|m3\|abbr=~}}`	2 (*Expression error: Missing operand for .** )	Input: both name and symbol
`{{convert\|2\|cuyd\|m3\|disp=unit2}}`	2 *Expression error: Missing operand for .**	Output unit (symbol)
`{{convert\|2\|cuyd\|m3\|disp=unit2\|abbr=off}}`	2 *Expression error: Missing operand for .**	Output unit (name)
`{{convert\|2\|cuyd\|m3\|disp=number}}`	2 *Expression error: Missing operand for .**	Output value
`{{convert\|2\|cuyd\|m3\|disp=out}}`	2 *Expression error: Missing operand for .**	Output value and unit name
`{{convert\|2\|cuyd\|m3\|disp=out\|abbr=off}}`	2 *Expression error: Missing operand for .**	Output value and unit symbol

Display both input name and symbol: 2 kilopascals [kPa]

Setting |abbr=~ returns both name and symbol of the first (input) unit:

{{convert|2|kPa|psi|abbr=~}} → 2 (Expression error: Missing operand for *. )
A {{convert|2|kPa|psi|abbr=~|adj=on}} pressure → <templatestyles src="nowrap/core.css"/>A 2 (Expression error: Missing operand for *. ) pressure

Table options

For the wikitable structure, there are three options: add a line-break, split the result over columns and make the table sortable.

Enforced line break

|disp=br adds a line-break and omits brackets.

|disp=br() adds a line-break and does add brackets to the converted value. This may be useful in tables:

`\|disp=br`	`\|disp=br()`
100 kilometres62.1371192 mi	100 kilometres62.1371192 mi

Table columns

Using {convert} in a table cell, with |disp=table splits the result over two (or more) columns. By default units are not included in the table, however, they can be added using the |abbr= parameter. Multiple-unit outputs, like ftin, always output their units to the table.

{{convert|10|m|ft|disp=table}} →

10 metres32.808399 ft

|disp=tablecen does the same, and also centers the text:

{{convert|20|m|ft|disp=tablecen}} →

20 metres65.616798 ft

The units are added as a column header:

	kilograms	pounds	stone and pounds
`\|disp=table`	10 *Expression error: Missing operand for .**
`\|disp=table` and `\|abbr=on`	20 *Expression error: Missing operand for .**
`\|disp=table` and `\|abbr=off`	30 *Expression error: Missing operand for .**
`\|disp=tablecen`	40 *Expression error: Missing operand for .**
`\|disp=<other>` (default)	50 (*Expression error: Missing operand for .** )

Sorting

Use |sortable=on to include a hidden numerical sortkey in the output, suitable for use in a table with sortable columns. Technically, this places a hidden string before the actual displayed values:

{{convert|10|m|ft|sortable=on}} <templatestyles src="nowrap/core.css"/>→ <span data-sort-value="7001100000000000000♠"></span>10 metres (33 ft)

showing: 10 metres (32.808399 ft).

Use both |disp=table and |sortable=on together to produce table columns (pipe symbols) for each value in sortable columns:

	m	ft
A	15+3/4 metres17.460629925 ft
B	15.5 metres50.85301845 ft
C	16.0 metres52.4934384 ft
D	16 metres52.4934384 ft

The generated sortkey is calculated in a consistent way based on both the value and its unit as passed to the convert template. In most cases convert uses the passed value converted to SI base units. It is therefore not necessarily the displayed value or other alternate units and is calculated regardless of output format options. Using different units or different order of units in individual rows should therefore not lead to incorrect sorting, although variations in rounding can give surprising results, since an unrounded number is used for the sortkey.

Units

The conversion factors and physical constants are sourced here.

All units

Template:Selfref Template:Hatnote Template:Convert/list of units

Template:Anchor'per' units: kg/hl, miles per gallon

When using a slash (/), a unit like kg/hl is recognized as kilograms per hectolitre and will be converted with other mass/volume units.

{{convert|1000|kg/hl}} → 1,000 (Expression error: Missing operand for *. )

Population density (inhabitants per square mile) can be converted using

{{convert|10|PD/sqmi|PD/km2}} → 10 (Expression error: Missing operand for *. )

Vehicular fuel efficiency, commonly expressed in miles per gallon or litres per 100 km can also be converted

{{convert|26|mpgUS|l/100km mpgimp}} → 26 (Expression error: Missing operand for *. )

Template:AnchorUnits of difference: Expressing a change or difference in temperature

We have already discussed standard temperature conversions (°C, °F, K), as shown in these two examples:

{{#invoke:DemoTemplate|convert|10|C}} (standard temperature conversion)
{{#invoke:DemoTemplate|convert|10–15|C}} (standard temperature range conversion)

When expressing a temperature change (e.g., "The temperature increased by 10 °C"), or when comparing temperatures (e.g., "10 to 15 °C warmer"), we cannot use the standard temperature units (|C, |F and |K), which refer to points on the respective scale. Instead, we must use one of the following "units of difference": |C-change, |F-change and |K-change.

Compare the following two examples with the two above:

{{#invoke:DemoTemplate|convert|10|C-change}} increase in temperature
{{#invoke:DemoTemplate|convert|10–15|C-change}} warmer than normal

To produce multiple units in the output:

{{#invoke:DemoTemplate|convert|10|C-change|F-change K-change}} difference

Multiple units: 1 ft 5 in

In input

Base document Template:Slink lists options for multiple unit input (like ft,in). It can catch predefined sets only (units that can be subdivided; e.g., yd into ft):

{{convert|1|yd|2|ft|3|in}} → 1 yard (Expression error: Unexpected round operator. )
{{convert|2|ft|3|in|cm}} → 2 feet (Expression error: Unexpected round operator. )
{{convert|1|lb|5|oz|g}} → 1 (Expression error: Unexpected round operator. )

In output

Available multiple-unit output options predefined, like ftin and ydftin. The full list is at Template:Slink.

{{convert|2|m|ftin}} → 2 metres (Expression error: Missing operand for *. )
{{convert|2|m|ft in}} → 2 metres (Expression error: Missing operand for *. ), using a space, returns the decimal point

Default behaviour, for comparison:

{{convert|2|m}} → 2 metres (Expression error: Missing operand for *. )

Currency per unit: $/mi → $/km

Using currency symbols in a $ per unit value, you can convert the per-unit:

{{convert|10|$/mi|$/km}} → 10 (Expression error: Missing operand for *. )
{{convert|1500|$/ozt|$/g}} → 1,500 (Expression error: Missing operand for *. )

You can set the currency in both values using |$=€:

{{convert|10|$/mi|$/km|$=€}} → 10 (Expression error: Missing operand for *. )

It is not possible to convert the currency. So, this result (mixed currencies) is not possible: Template:!mxt Template:Nay

Using convert inside templates

For usage in template code, like infoboxes, Template:Tlf has these options:

Pre-formatting fraction input

Module:Convert/helper can read regular input and pre-format it into Template:Tlf-accepted input.

Your template can accept |input=16 7/8 and use {{#invoke:Convert/helper|number|16 7/8}} → {{#invoke:Convert/helper|number|16 7/8}}

Using a Wikidata property

Adding the Wikidata property code, like code |input=P2073, to your template code automatically returns the Wikidata property for that article, and convert it. Both number and unit are read.

Note: to return that property value for an other article, use |qid=.

Example for Template:Wikidata property link: Note: this example uses |qid=Q1056131 (testing for Template:Wikidata entity link)

{{convert|input=P2073|qid=Q1056131|ftin|abbr=on}} → ftin (Expression error: Unrecognized word "ftin". )
{{convert|input=P2073|qid=Q1056131|km|abbr=on}} → km (Expression error: Unrecognized word "km". )
{{convert|input=P2073|qid=Q1056131|km|abbr=on|disp=out}} → km Expression error: Unrecognized word "km".

For example see template:Infobox Telescope.

Sometimes a property may have more than one value against it in Wikidata. You can use the |qual= parameter to specify which of the values you want to use.

Example for Template:Wikidata property link: Note: this example uses |qid=Q1513315 (testing for Template:Wikidata entity link)

Template:Wikidata entity link: {{convert|input=P2386|qual=Q613628|ft|abbr=on}} → ft (Expression error: Unrecognized word "ft". )
Template:Wikidata entity link: {{convert|input=P2386|qual=Q1395645|ft|abbr=on}} → ft (Expression error: Unrecognized word "ft". )

Parameter list

Template:Convert/doc/parameter list

Deprecated options

Template:Convert/doc/deprecations list

TemplateData

Template:TemplateDataHeader

<templatedata> { "description": "Converts measurements to other units.", "params": { "1": { "label": "Value", "description": "The value to convert.", "type": "number", "required": true }, "2": { "label": "From unit", "description": "The unit for the provided value.", "type": "string", "example": "km", "required": true }, "3": { "label": "To units", "description": "The units to convert into. Separate units by a space for multiple outputs. In an output unit, use + for a multiplication space.", "type": "string", "example": "mi nmi", "suggested": true }, "4": { "label": "Precision or suffix", "description": "Significant digits after decimal dot or, if negative, exponent of ten.", "type": "number" }, "lk": { "label": "Link units", "description": "Indication of what units to apply wikilinks to. Use “on” for all, “in” for the input unit, “out” for the output units, or “off” for none of the units.", "default": "off", "type": "string", "example": "on" }, "abbr": { "label": "Abbreviation", "description": "Display for the units: “on” to display all units using their unit symbols, “off” to display all units in full words, “in” to display the unit symbol for the input unit, “out” to display the unit symbols for the output units, “unit” to display unit symbols for both input and output units when using scientific notation, “values” for no units at all (neither unit symbols nor full words of units).", "default": "out", "type": "string", "example": "on, unit, in, out, off", "suggested": true }, "sp": { "label": "Spelling", "description": "Spelling of units. Use “us” to display unit names using U.S. spelling.", "type": "string", "example": "us" }, "adj": { "label": "Adjective", "description": "Whether to use adjectival form. Use “on” for singular unit name appended by a hyphen, “mid” to put conversion at end, or “off” (default) for no adjectival form.", "type": "unbalanced-wikitext", "example": "on", "default": "off" }, "disp": { "label": "Conversion", "description": "Display conversion result: “or”: after ‘or’, “x”: with custom prefix and suffix, “b”: in parentheses, “table”/“tablecen”, “output only”: alone, “output number only”: alone and without unit, “unit”: not at all but input unit; if the value is a number it is used as precision.", "type": "string", "example": "b" }, "order": { "label": "Ordering", "description": "“flip” returns converted value first, input value second.", "type": "string", "example": "flip" }, "sigfig": { "label": "Significant figures", "description": "Indicates the number of significant figures to be used in rounding.", "type": "number" }, "round": { "label": "Rounding output", "description": "The type of rounding. “5” rounds the output number to nearest multiple of 5, “25” to nearest multiple of 25, “each” rounds each number in a range.", "type": "number" }, "comma": { "label": "Thousands separator", "description": "Sets or suppresses the use of thousands separators in the numbers. “off”: no separator; “gaps”: use space instead of comma as thousands separator; “5”: only add thousands separator when the integral part of the number uses 5 positions or more (10,000 or more; if using comma as thousands separator, 1234 would produce '1234', 12345 would produce '12,345').", "default": "on", "type": "string", "example": "off" }, "sortable": { "label": "Sort key", "description": "“on” generates a hidden sort key", "type": "string", "example": "on" }, "spell": { "label": "Spell numbers?", "description": "If used, spells input or input and output numbers in words, optionally capitalizing the first", "example": "'in', 'In', 'on', or 'On'", "type": "string" }, "sing": { "type": "string", "deprecated": "use adj=", "label": "Singular?", "description": "If 'yes', uses singular form of units (deprecated)", "example": "yes" }, "frac": { "label": "Fraction?", "description": "fraction as rounding unit", "type": "number" }, "$": { "label": "Currency symbol", "description": "sets currency symbol in both units", "example": "$=€ will show \" €10 per mile (€6.2/km)\"", "type": "string" }, "input": { "label": "WD property", "description": "Reads the property value of the item (article), then converts it", "example": "{{{1}}} (Expression error: Unrecognized punctuation character "{". ) (P2046=area)", "type": "string" } }, "format": "inline" } </templatedata>

@@ Line 1: / Line 1: @@
-{{documentation subpage}}
+{{documentation subpage}}<!--
-<!-- Documentation here -->
+Template convert transclusions
+Statistics on total tc's:
+-09-05 673940
+-12-16 693141
+-01-28 700000
+-08-31 736989
+-05-25 789091
+-11-17 832994
+-07-29 872000
+-12-15 902231
+-12-27 957770
+-01-12 960769
+-10-26 995152
+-01-01 by TDmonthly error report: Page [article] count: 651064; Transclusion count: 2878293
+-->
+{{hatnote|For currency conversion into US dollars, see [[Template:To USD]]}}
+{{#ifeq:{{FULLPAGENAME}}|Template:Convert|{{high-risk| {{formatnum:995000}}+ }}}}
+{{Transwiki guide |small=yes |text=See [[Template:Convert/Transwiki guide|'''this information''']] on copying this template and modifying it for use on another wiki.}}
+{{Lua|Module:Convert}}
+'''Template {{tl|convert}}''' ''calculates'' from one measurement unit to another one, and then ''presents'' the results formatted. The complete list of unit symbols recognized by the template is at [[Module:Convert/documentation/conversion data]].
-Converts Minecraft terms to real-life units and vice versa.
+For example:
+:<code><nowiki>{{convert|2|km|mi}}</nowiki></code> → {{convert|2|km|mi}} <small>(km entered, so converted into mile)</small>
+:<code><nowiki>{{convert|7|mi|km}}</nowiki></code> → {{convert|7|mi|km}} <small>(mi entered, so converted into km)</small>
-; Parameters
+''Numbers'' can be rounded, ''units'' can be abbreviated into symbols:
-*{{p|1}}: value to convert (e.g., ''2400'')
+:<code><nowiki>{{convert|2|km|mi|2|abbr=on}}</nowiki></code> → {{convert|2|km|mi|2|abbr=on}}
-*{{p|2}}: full name of unit to convert from (e.g., ''mile'')
+:<code><nowiki>{{convert|7|mi|km|2|abbr=on}}</nowiki></code> → {{convert|7|mi|km|2|abbr=on}}
-*{{p|3}}: full name of unit to convert to (e.g., ''kilometer'')
+Value ''ranges'' can be entered using <code>|to|...</code> or <code>|-|...</code>:
-*{{p|seperator}}: optional seperator (defaults to a space with brackets)
+:<code><nowiki>{{convert|2|to|5|km|mi}}</nowiki></code> → {{convert|2|to|5|km|mi}}
+:<code><nowiki>{{convert|2|-|5|km|mi}}</nowiki></code>  → {{convert|2|-|5|km|mi}}
-; Available units
+Combined effect example:
-{{flatlist|
+:<code><nowiki>{{convert|2|-|5|km|mi|2|abbr=on}}</nowiki></code> → {{convert|2|-|5|km|mi|2|abbr=on}}
-*fahrenheit
+:<code><nowiki>{{convert|2|and|5|km|mi|sigfig=3|abbr=off}}</nowiki></code> → {{convert|2|and|5|km|mi|sigfig=3|abbr=off}}
-*celsius
-*minute
-*second
-*kilograms
-*miles
-*kilometers
-}}
-;Examples
+{{hatnote|See [[Help:Convert]] for more detailed, technical information}}
-*(using defaults) – {{t|convert|5}}: {{convert|5}}
-*{{t|convert|2400|mile|kilometer|seperator{{=}}&amp;nbsp;->&amp;nbsp;}}: {{convert|2400|mile|kilometer|seperator= -> }}
-<includeonly>
+==Units to convert==
-<!-- Template categories/interwiki here -->
+{{hatnote|See also: the summary at [[Template:Convert/list of units|Complete list of units for {{tlf|Convert}}]] and the complete list at [[ Module:Convert/documentation/conversion data]]}}
-</includeonly>
+Enter units to convert ''from''&nbsp;''into'':
+* <code><nowiki>{{convert|1|lb|kg}}</nowiki></code> → {{convert|1|lb|kg}}
+:[[International System of Units|SI]] units generally accept prefixes, like "m" for milli (10<sup>−3</sup>), and "M" for mega (10<sup>6</sup>)
+:For "per" units, use "/" (slash): kg/ha
+:For three-unit units, etc., see {{cl|Convert-like templates}}
+==Unit name or symbol (abbreviation): ''1 pound'' or ''1 lb''?==
+By default, the first quantity shows the unit name, the second shows the symbol (or abbreviation):
+* <code><nowiki>{{convert|1|lb|kg}}</nowiki></code> → {{convert|1|lb|kg}}
+Using {{para|abbr|in}} is the ''reverse behaviour'' to the default:
+*<code><nowiki>{{convert|1|lb|kg|abbr=in}}</nowiki></code> → {{convert|1|lb|kg|abbr=in}}
+To abbreviate both or neither:
+* <code><nowiki>{{convert|1|lb|kg|abbr=on}}</nowiki></code> → {{convert|1|lb|kg|abbr=on}}
+* <code><nowiki>{{convert|1|lb|kg|abbr=off}}</nowiki></code> → {{convert|1|lb|kg|abbr=off}}
+===Convenience: {{tlf|cvt}} has {{para|abbr|on}} by default===
+Template {{tl|cvt}} is the same as {{tlf|convert}}, except that it has {{para|abbr|on}} as the default behaviour. In {{tlf|cvt}}, all other options are available. So:
+:<code><nowiki>{{cvt|1|lb|kg}}</nowiki></code> → {{cvt|1|lb|kg}}
+is equivalent to:
+:<code><nowiki>{{convert|1|lb|kg|abbr=on}}</nowiki></code> → {{cvt|1|lb|kg|abbr=on}}
+==Adjective: ''a 10-mile distance''==
+Use {{para|adj|on}} to produce the adjectival (hyphenated) form:
+* <code><nowiki>A {{convert|10|mi|km|adj=on}} distance</nowiki></code> → A {{convert|10|mi|km|adj=on}} distance.
+Default behaviour, for comparison:
+* <code><nowiki>{{convert|10|mi|km}} to go</nowiki></code> → {{convert|10|mi|km}} to go.
+{{para|adj|on}} does not produce hyphens with unit symbols, as per [[MOS:UNITSYMBOLS|Manual of Style]]:
+* <code><nowiki>A {{convert|9|in|cm|adj=on|abbr=on}} nail</nowiki></code> → A {{convert|9|in|cm|adj=on|abbr=on}} nail.
+=={{anchor|Rounding}}Rounding: ''100 ft'' is ''30&nbsp;m'' or ''30.5&nbsp;m'' or ''30.48&nbsp;m''?==
+{{hatnote|See {{section link|Help:Convert#Rounding}} for a more mathematical description of the rounding options}}
+By definition, 100&nbsp;ft equals {{convert|100|ft|m|sigfig=4|disp=out}}. In practical use, it is common to round the calculated metric number. With that, there are several possibilities.
+===Default rounding===
+By {{tlf|Convert}} default, the conversion result will be rounded either to precision comparable to that of the input value (the number of digits after the decimal point—or the negative of the number of non-significant zeroes before the point—is increased by one if the conversion is a multiplication by a number between 0.02 and 0.2, remains the same if the factor is between 0.2 and 2, is decreased by 1 if it is between 2 and 20, and so on) or to two significant digits, whichever is more precise. An exception to this is ''rounding temperatures'' (see [[#Rounding temperatures|below]]).
+{| class="wikitable"
+|-
+! colspan="3" | Examples of rounding
+|-
+|'''Input'''||'''Displays as'''||'''Note'''
+|-
+|<code><nowiki>{{convert|123|ft|m|-1}}</nowiki></code> || {{convert|123|ft|m|-1}} ||
+|-
+|<code><nowiki>{{convert|123|ft|m}}</nowiki></code> || {{convert|123|ft|m}} || same output as with 0 (below)
+|-
+|<code><nowiki>{{convert|123|ft|m|0}}</nowiki></code> || {{convert|123|ft|m|0}} ||
+|-
+|<code><nowiki>{{convert|123|ft|m|1}}</nowiki></code> || {{convert|123|ft|m|1}} ||
+|-
+|<code><nowiki>{{convert|123|ft|m|2}}</nowiki></code> || {{convert|123|ft|m|2}} ||The more-exact value is 37.4904 m or so, which gets converted to 37 m if this parameter is not specified at all.
+|-
+|<code><nowiki>{{convert|500|ft|m|-1}}</nowiki></code> || {{convert|500|ft|m|-1}} ||
+|-
+|<code><nowiki>{{convert|500|ft|m}}</nowiki></code> || {{convert|500|ft|m}} || same output as with −1 (above), because the conversion factor is between 0.2 and 2 (hence, it should produce same double-zero precision (−2) as in the input value), but the conversion must produce two significant digits at a minimum (hence, a higher single-zero precision (−1) is used)
+|-
+|<code><nowiki>{{convert|500|ft|m|0}}</nowiki></code> || {{convert|500|ft|m|0}} ||
+|-
+|<code><nowiki>{{convert|500|ft|m|1}}</nowiki></code> || {{convert|500|ft|m|1}} ||
+|-
+|<code><nowiki>{{convert|500|ft|m|2}}</nowiki></code> || {{convert|500|ft|m|2}} || exact value is 152.4 m
+|-
+|<code><nowiki>{{convert|500|ft|cm|-3}}</nowiki></code> || {{convert|500|ft|cm|-3}} ||
+|-
+|<code><nowiki>{{convert|500|ft|cm}}</nowiki></code> || {{convert|500|ft|cm}} || same output as with −3 (above), because the conversion factor is between 20 and 200 (hence, it should decrease input value's double-zero precision (−2) by 2), but the conversion must produce two significant digits at a minimum (hence, a higher triple-zero precision (−3) is used)
+|-
+|<code><nowiki>{{convert|500|ft|cm|0}}</nowiki></code> || {{convert|500|ft|cm|0}} ||
+|}<!--NOTE: rows require "nowiki", using &#123;{ disappears. -->
+''Convert'' supports four types of rounding:
+===Round to a given precision: ''use a precision number''===
+Specify the desired precision with the ''fourth unnamed parameter'' (or third unnamed parameter if the "convert to" parameter is omitted; or fifth unnamed parameter if a range is specified; or fourth unnamed parameter again if a range is specified and the "convert to" parameter is omitted; needs to be replaced with a "precision" named parameter). The conversion is rounded off to the nearest multiple of {{frac|10}} to the power of this number. For instance, if the result is 8621 and the round number is "-2", the result will be 8600. If the result is "234.0283043" and the round number is "0", the result will be 234.
+{{Anchor|Round to a given number of significant figures}}
+===Round to a given number of significant figures: ''{{para|sigfig|}}''===
+To specify the output number to be with ''n'' significant figures use {{para|sigfig|&lt;number>}}:
+* <code><nowiki>{{convert|1200|ft|m|sigfig=4}}</nowiki></code> → {{convert|1200|ft|m|sigfig=4}}
+* <code><nowiki>{{convert|1200|ft|m|sigfig=3}}</nowiki></code> → {{convert|1200|ft|m|sigfig=3}}
+* <code><nowiki>{{convert|1200|ft|m|sigfig=2}}</nowiki></code> → {{convert|1200|ft|m|sigfig=2}}
+* <code><nowiki>{{convert|1200|ft|m|sigfig=1}}</nowiki></code> → {{convert|1200|ft|m|sigfig=1}}
+Default behaviour, for comparison:
+* <code><nowiki>{{convert|1200|ft|m}}</nowiki></code> → {{convert|1200|ft|m}}
+Setting {{para|sigfig}} to a value less than 1 is meaningless:
+* <code><nowiki>{{convert|1200|ft|m|sigfig=0}}</nowiki></code> → {{convert|1200|ft|m|sigfig=0}} {{nay}}
+===Round to a multiple of 5: ''15'', ''20'', ''25'', ...===
+Using {{para|round|5}} rounds the outcome to a multiple of 5.
+* <code><nowiki>{{convert|10|m|ft}}</nowiki></code> → {{convert|10|m|ft}}
+* <code><nowiki>{{convert|10|m|ft|round=5}}</nowiki></code> → {{convert|10|m|ft|round=5}}
+Similar: using {{para|round|25}} rounds the outcome to a multiple of 25.
+* <code><nowiki>{{convert|10|m|ft}}</nowiki></code> → {{convert|10|m|ft}}
+* <code><nowiki>{{convert|10|m|ft|round=25}}</nowiki></code> → {{convert|10|m|ft|round=25}}
+Default behaviour, for comparison:
+* <code><nowiki>{{convert|10|m|ft|sigfig=4}}</nowiki></code> → {{convert|10|m|ft|sigfig=4}}
+In a range, one can round ''each value'' individually to the default. Use {{para|round|each}}:
+* <code><nowiki>{{convert|10 x 200 x 3000|m|ft}}</nowiki></code> → {{convert|10 x 200 x 3000|m|ft}}
+* <code><nowiki>{{convert|10 x 200 x 3000|m|ft|round=each}}</nowiki></code> → {{convert|10 x 200 x 3000|m|ft|round=each}}
+===<span id="Round to a multiple of a given fraction"></span>Round to a multiple of a given fraction: ''{{frac|2|3|16}} inch''===
+Specify the desired ''denominator'' using {{para|frac|&lt;some positive integer&gt;}}. ([[Fraction (mathematics)|Denominator]] is the below-the-slash number, for example the 3 in {{frac|1|3}}).
+* <code><nowiki>{{convert|5.56|cm|in|frac=16}}</nowiki></code> → {{convert|5.56|cm|in|frac=16}}
+* <code><nowiki>{{convert|8|cm|in|frac=4}}</nowiki></code> → {{convert|8|cm|in|frac=4}}
+The fraction is reduced when possible:
+* <code><nowiki>{{convert|8|cm|in|frac=100}}</nowiki></code> → {{convert|8|cm|in|frac=100}}
+Default behaviour uses decimal notation:
+* <code><nowiki>{{convert|5.56|cm|in}}</nowiki></code> → {{convert|5.56|cm|in}}
+==={{anchor|Rounding temperatures}}Rounding temperatures: ''°C'', ''°F'' and ''K''===
+In temperatures, the conversion will be rounded either to the precision comparable to that of the input value or to that which would give three significant figures when expressed in kelvins, whichever is more precise.
+#{{#invoke:DemoTemplate|convert|10,000|C|F K}}
+#{{#invoke:DemoTemplate|convert|10,000.1|C|F K}}
+#{{#invoke:DemoTemplate|convert|-272|C|F K}}
+#{{#invoke:DemoTemplate|convert|-272|C}}
+#{{#invoke:DemoTemplate|convert|100|C|F K}}
+#{{#invoke:DemoTemplate|convert|0|C|F K}}
+The precision of the input number in example (1) is one digit, but the precision of its Kelvins expression is three, so the precision of the Fahrenheit conversion is ''made'' three (made 180...) . (1) and (2) seem to belie the fact that a {{convert|0.1|C-change|F-change|disp=x| is a |abbr=off}}, and make the 32 degrees difference shown in (1) begin to seem off somehow.
+Result (1) seems off until you set the [[significant figures]] yourself with {{para|sigfig}}:
+:{{#invoke:DemoTemplate|convert|10000|C|sigfig=5}}
+or you set the precision ''positionally'', relative to the decimal point (zero being ''at'' the decimal point):
+:{{#invoke:DemoTemplate|convert|10000|C|0}}
+The precision of the input number in example (2) is six, so the precision of the Fahrenheit output is, whereas before, Kelvins had determined it to be three. Examples (3) and (4) show how this can be hidden and generate questions, but it occurs there because the Kelvins conversion generated two fractional parts. (Before it was the input number that generated the fractional part.)  In example (3) the three input digits converted into five significant output digits because of the two digits after the decimal point, generated by the Kelvins conversion. This happened again in (5), but in (6) decimal fractions were neither given as input nor induced by the Kelvins conversion.
+===Rounding input===
+There is limited support for rounding the displayed ''input'' number.  The rounding takes place ''after'' conversion, so the output is based on the full-precision input.  This is useful when the input is produced by {{tlc|&#35;expr:}} or otherwise available to a higher precision than is usefully displayed, and it's desirable to avoid double-rounding.
+To round the input to a specified number of digits after the decimal point, use one of the parameters:
+* {{para|adj|ri0}}
+* {{para|adj|ri1}}
+* {{para|adj|ri2}}
+* {{para|adj|ri3}}
+Note that there is no {{para|adj|ri-1}}{{nay}} or similar for rounding above the decimal place.  Neither is there support for significant figures, multiples of 5, or any other output-rounding feature.
+The default precision is computed based on the input, so an explicit output precision must usually be supplied:
+* {{tlc|convert|4.14159|mi|km|adj{{=}}ri0}} → {{convert|4.14159|mi|km|adj=ri0}} {{nay}} (precisions are mismatched)
+* {{tlc|convert|4.14159|mi|km|0|adj{{=}}ri0}} → {{convert|4.14159|mi|km|0|adj=ri0}} {{aye}}
+In this case, if the input were rounded before conversion, a different result would be obtained:
+* {{tlc|convert|<nowiki>{{#expr:4.14159 round 0}}</nowiki>|mi|km|0}} → {{convert|{{#expr:4.14159 round 0}}|mi|km|0}} {{nay}} (double rounding)
+==Into multiple units: ''{{convert|10|C|F K}}''==
+Separate the multiple output units by a space:
+* <code><nowiki>{{convert|10|C|F K}}</nowiki></code> → {{convert|10|C|F K}}
+* <code><nowiki>{{convert|5|km|mi nmi}}</nowiki></code> → {{convert|5|km|mi nmi}}
+If the output unit names contain spaces, use <code>+</code> as the separator.
+See also:
+* For multiple-unit options like ''1 ft 5 in'', see {{section link||In input}} and {{section link||In output}}.
+==Ranges of values==
+{{For|a conversion of a difference|#Units of difference}}
+A ''range'' converts ''two'' values and separates them by your choice of words and punctuation.
+===A range: ''6 to 17 kg (13 to 37 lb)''===
+Range indicators are entered as the second parameter (between the values). Range separators can be:<br/>
+{{Convert/doc/range separator list}}
+===Multiple dimensions: ''{{convert|6|x|12|m|ft|abbr=on}}''===
+Use <code>by</code>:
+* <code><nowiki>{{convert|6|by|12|ft|m}}</nowiki></code> → {{convert|6|by|12|ft|m}}
+Use <code>×</code>, multiplication sign, or <code>x</code>, letter:
+* <code><nowiki>{{convert|6|x|12|m|ft}}</nowiki></code> → {{convert|6|x|12|m|ft}}
+In science, the formal way is to set <code>&#x7c;x&#x7c;</code> and {{para|abbr|on}} (keeping dimensions right, like in ''area = x km<sup>2</sup>''):
+* <code><nowiki>{{convert|6|x|12|m|ft|abbr=on}}</nowiki></code> → {{convert|6|x|12|m|ft|abbr=on}}
+===Lists of values: ''20, 40, or 60 miles''===
+:<code><nowiki>{{convert|20|,|40|, or|60|mi}}</nowiki></code> &rarr; {{convert|20|,|40|, or|60|mi}}
+===About ''feet, inch'' in ranges and multiples===
+While it is possible to enter feet, inch in a simple conversion, this is not possible for ranges:
+* <code><nowiki>{{convert|1|ft|3|in|x|3|ft|5|in|mm}}</nowiki></code> → {{convert|1|ft|3|in|x|3|ft|5|in|mm}} {{nay}}
+Default behaviour, for comparison:
+* <code><nowiki>{{convert|1|ft|3|in|mm}}</nowiki></code> → {{convert|1|ft|3|in|mm}}
+However, converting metric units into feet and inches with {{para|order|flip}} can produce the desired output:
+* <code><nowiki>{{convert|380|x|1040|mm|ftin|order=flip}}</nowiki></code> → {{convert|380|x|1040|mm|ftin|order=flip}}
+==Words==
+===Spelling of unit name: international ''metre'' or US ''meter''?===
+Default spelling of units is in the en (generic) locale. To show en-US spelling, use {{para|sp|us}}:
+:<code><nowiki>{{convert|1|m|ft}}</nowiki></code> → {{convert|1|m|ft}}—''default''
+:<code><nowiki>{{convert|1|m|ft|sp=us}}</nowiki></code> → {{convert|1|m|ft|sp=us}}
+===<span id="spell"></span>Spell out numbers: ''ten miles''===
+To write a number in words, use {{para|spell|in}}:
+* <code><nowiki>{{convert|10|mi|m|spell=in}}</nowiki></code> → {{convert|10|mi|m|spell=in}}
+To spell out both in and out values, use {{para|spell|on}}:
+* <code><nowiki>{{convert|10|mi|m|spell=on}}</nowiki></code> → {{convert|10|mi|m|spell=on}}
+To make first letter a capital, use {{para|spell|In}}, {{para|spell|On}}
+* <code><nowiki>{{convert|10|mi|m|spell=In}}</nowiki></code> → {{convert|10|mi|m|spell=In}}
+* <code><nowiki>{{convert|10|mi|m|spell=On}}</nowiki></code> → {{convert|10|mi|m|spell=On}}
+Remember that the spelling of the units (ft, m) is independently set by {{para|abbr|}}. To the extreme:
+* <code><nowiki>{{convert|10|mi|m|spell=on|abbr=off|sp=us}}</nowiki></code> → {{convert|10|mi|m|spell=on|abbr=off|sp=us}}
+===Inserted before units: ''4 planted acres''===
+*<code><nowiki>{{convert|4|acre||adj=pre|planted}}</nowiki></code> → {{convert|4|acre||adj=pre|planted}}
+<code>disp=preunit</code> is similar, but has no separator after the specified text, and can have different text for the output value:
+*<code><nowiki>{{convert|4|acre||disp=preunit|planted }}</nowiki></code> → {{convert|4|acre||disp=preunit|planted }}
+*<code><nowiki>{{convert|4|acre||disp=preunit|planted |reforested-}}</nowiki></code> → {{convert|4|acre||disp=preunit|planted |reforested-}}
+===After adjective unit: ''A {{convert|10|ft|ft|adj=mid|-long|disp=out|order=flip}} corridor''===
+Note that two units (in this case, ft and m) are required. Use with just one unit will generate an error message.
+:<code><nowiki>{{convert|10|ft|m|adj=mid|-long}}</nowiki></code> → {{convert|10|ft|m|adj=mid|-long}}
+===Plurals: ''1&nbsp;inch, 2&nbsp;inches''===
+The unit symbol is singular always. Depending on the preceding number only, a unit name can be shown plural.
+* <code><nowiki>{{convert|1|metre}}</nowiki></code> → {{convert|1|metre}}
+* <code><nowiki>{{convert|2|metre}}</nowiki></code> → {{convert|2|metre}}
+* <code><nowiki>{{convert|2|metre|abbr=on}}</nowiki></code> → {{convert|2|metre|abbr=on}}
+;Exception:
+Entering the unit spelled <code>|foot|</code> forces singular output "foot", whatever the number is.
+* <code><nowiki>{{convert|100|foot|abbr=off}}</nowiki></code> → {{convert|100|foot|abbr=off}}
+===Fractions: ''one-eighth of an imperial pint''===
+The convert template also supports spelling out fractions.
+* <code><nowiki>{{convert|3+1/2|oz|g|spell=in}}</nowiki></code> → {{convert|3+1/2|oz|g|spell=in}}
+Any additional words needed for the fraction can also be added at the end of the template.
+* <code><nowiki>{{convert|1/8|imppt|ml|spell=in|adj=pre|of an}}</nowiki></code> → {{convert|1/8|imppt|ml|spell=in|adj=pre|of an}}
+<!-- todo: decimals & negative examples -->
+===Wrapping and line breaking===
+:See {{section link|Help:Convert|Wrapping and line breaking}}
+===<span id="million"></span>Spelling out "thousands", "millions", etc.===
+Most unit codes accept a prefix of e3 (thousand) or e6 (million) or e9 (billion).
+* <code><nowiki>{{convert|100|e6mi|e6km}}</nowiki></code> → {{convert|100|e6mi|e6km}}
+* <code><nowiki>{{convert|120|e6acre}}</nowiki></code> → {{convert|120|e6acre}}
+* <code><nowiki>{{convert|120|e6acre|e3km2}}</nowiki></code> → {{convert|120|e6acre|e3km2}}
+To display both input and output in scientific notation, use {{para|abbr|on}}
+* <code><nowiki>{{convert|100|e6mi|e6km|abbr=on}}</nowiki></code> → {{convert|100|e6mi|e6km|abbr=on}}
+To spell out "thousands", "millions", etc., {{para|abbr|unit}} abbreviates the unit; {{para|abbr|off}} displays both full unit names.
+* <code><nowiki>{{convert|100|e6mi|e6km|abbr=unit}}</nowiki></code> → {{convert|100|e6mi|e6km|abbr=unit}}
+* <code><nowiki>{{convert|100|e6mi|e6km|abbr=off}}</nowiki></code> → {{convert|100|e6mi|e6km|abbr=off}}
+==Numbers==
+===Using an SI prefix: ''gigametre (Gm)'', or ''micrometre (&#x03BC;m)''===
+{{Sidebar metric prefixes (small)}}
+Units can have an [[metric prefix|SI prefix]] like <code>G</code> before the unit: <code>Gm</code>, and <code>giga</code> before the name: <code>gigametre</code>. These are plain multiplication factors.
+To illustrate, these are trivial calculations (from metre to metre), showing the multiplication factor:
+* {{convert|12|Gm|m|abbr=on}}
+* {{convert|12|μm|m|abbr=on}}
+The prefix can be added before the SI unit (here: unit <code>m</code> for metre):
+* <code><nowiki>{{convert|12|Gm|mi|abbr=on}}</nowiki></code> → {{convert|12|Gm|mi|abbr=on}}
+* <code>Mm</code>: {{convert|12|Mm|mi|abbr=on}}
+* <code>km</code>: {{convert|12|km|ft|abbr=on}}
+* <code>mm</code>: {{convert|12|mm|in|abbr=on}}
+* <code>&#x03BC;m</code>: {{convert|12|μm|mm|abbr=on}}
+* <code>um</code>: {{convert|12|um|mm|abbr=on}} (letter "u" can be used for "&#x03BC;" here)
+The prefix can be used in the output unit:
+* <code><nowiki>{{convert|12000|mi|Mm|abbr=on}}</nowiki></code> → {{convert|12000|mi|Mm|abbr=on}}
+* <code><nowiki>{{convert|12|in|μm|abbr=on}}</nowiki></code> → {{convert|12|in|μm|abbr=on}}
+As an exception, the non-SI unit "inch" can have the "&#x03BC;" prefix too:
+* <code><nowiki>{{convert|12|&#x03BC;m|μin|abbr=on}}</nowiki></code> → {{convert|12|μm|μin|abbr=on}}
+{{further information|Help:Convert units#SI prefixes}}
+===Engineering notation: ''7 × 10<sup>6</sup> m''===
+====In the unit: ''e6m''====
+[[Engineering notation]] can be entered as a "prefix" to the unit:
+* <code><nowiki>{{convert|70|e6m}}</nowiki></code> → {{convert|70|e6m|abbr=on}}
+The same is possible for the output unit:
+* <code><nowiki>{{convert|23,000,000|ft|e6m}}</nowiki></code> → {{convert|23,000,000|ft|e6m}}
+Any standard unit (not a combination, multiple, or built-in unit) can have such a prefix:
+* <code>e3</code> (thousand),
+* <code>e6</code> (million),
+* <code>e9</code> (billion),
+* <code>e12</code> (trillion),
+* <code>e15</code> (quadrillion).
+===Scientific notation: ''1.23 × 10<sup>−14</sup>''===
+In [[scientific notation]], a number is written like {{rnd|12.3e-15|16}}. The plain number has exactly one digit before the decimal point.
+With {{tlf|convert}}, the input can be in e-notation such as <code>12.3e4</code>. This value is displayed as a power of ten, and the output is displayed in scientific notation, except that an output value satisfying 0.01 <= v < 1000 is shown as a normal number. In addition, if the output value is 1000 and sigfig=4 is used, the value is displayed as a normal number.
+*<code><nowiki>{{convert|12.3e-15|atm|atm|abbr=on}}</nowiki></code> → {{convert|12.3e-15|atm|atm|abbr=on}}
+*<code><nowiki>{{convert|0.00000005|atm|atm|abbr=on}}</nowiki></code> → {{convert|0.00000005|atm|atm|abbr=on}}
+===Input with fractions: ''{{convert|1+1/2|in|mm|1}}''===
+The number to convert can be written in fractions. Both <code>/</code> (keyboard slash) and <code>⁄</code> (fraction slash) are accepted:
+*<code><nowiki>{{convert|1/2|in|mm|1}}</nowiki></code> → {{convert|1/2|in|mm|1}}
+*<code><nowiki>{{convert|1⁄2|in|mm|1}}</nowiki></code> → {{convert|1⁄2|in|mm|1}}
+With positive [[mixed number]]s (a positive integer and a fraction), use a <code>+</code> sign
+*<code><nowiki>{{convert|2+1⁄2|in|mm|1}}</nowiki></code> → {{convert|2+1⁄2|in|mm|1}}
+With negative mixed numbers, use a hyphen <code>-</code> and repeat it:
+*<code><nowiki>{{convert|-2-1⁄2|in|mm|1}}</nowiki></code> → {{convert|-2-1⁄2|in|mm|1}}
+Note that the following cases are not interpreted as mixed numbers:
+*<code><nowiki>{{convert|2-1⁄2|in|mm|1}}</nowiki></code> → {{convert|2-1⁄2|in|mm|1}}. This is interpreted as a range from 2 inches to 1⁄2 inch.
+*<code><nowiki>{{convert|-2+1⁄2|in|mm|1}}</nowiki></code> → {{convert|-2+1⁄2|in|mm|1}} {{nay}} This is neither a mixed number nor a range, and mathematical expressions requiring calculations are not allowed here.
+===Horizontal fraction bar: ''{{sfrac|1|2}}&nbsp;inch''===
+<!-- technical restriction: TOC does not show the example horizontal bar intended here; rephrased section title-->
+Using a double slash (<code>//</code>) provides a horizontal fraction bar for the original (input) unit:
+* <code><nowiki>{{convert|1//2|in|mm|1}}</nowiki></code> → {{convert|1//2|in|mm|1}}
+* <code><nowiki>{{convert|6+3//8|in|mm|1}}</nowiki></code> → {{convert|6+3//8|in|mm|1}}
+Using a negative value for {{para|frac}} provides a horizontal fraction bar for the converted (output) unit:
+*<code><nowiki>{{convert|12.7|mm|frac=-2}}</nowiki></code> → {{convert|12.7|mm|frac=-2}}
+*<code><nowiki>{{convert|161.9|mm|frac=-8}}</nowiki></code> → {{convert|161.9|mm|frac=-8}}
+===Thousands separator: ''1,000 mi'' or ''1000 mi''===
+In input, a comma for thousands separator is accepted but not required; a gap (space) is not accepted. In output, by default, the thousand separator is the comma:
+* <code><nowiki>{{convert|1234567|m|ft}}</nowiki></code> → {{convert|1234567|m|ft}}
+* <code><nowiki>{{convert|1,234,567|m|ft}}</nowiki></code> → {{convert|1,234,567|m|ft}}
+Set {{para|comma|off}} to remove the separator from the output:
+* <code><nowiki>{{convert|1234567|m|ft|comma=off}}</nowiki></code> → {{convert|1234567|m|ft|comma=off}}
+Use {{para|comma|gaps}} to use digit grouping by gap (thin space) as a thousands separator:
+* <code><nowiki>{{convert|1234567|m|ft|comma=gaps}}</nowiki></code> → {{convert|1234567|m|ft|comma=gaps}}
+Default behaviour, for comparison:
+* <code><nowiki>{{convert|1234567|m|ft}}</nowiki></code> → {{convert|1234567|m|ft}}
+Setting {{para|comma|5}} will only add the separator when the number of digits is 5 or more:
+* <code><nowiki>{{convert|1234|m|ft|comma=5}}</nowiki></code> → {{convert|1234|m|ft|comma=5}}
+* <code><nowiki>{{convert|1234567|m|ft|comma=5}}</nowiki></code> → {{convert|1234567|m|ft|comma=5}}
+Default behaviour, for comparison:
+* <code><nowiki>{{convert|1234|m|ft}}</nowiki></code> → {{convert|1234|m|ft}}
+==Output manipulation==
+===Brackets and separators: ''10 m [33 ft]''===
+Punctuation that distinguishes the two measurements is set by {{para|disp|}}.<br/>
+Options are: <code>b</code> <small>(the default)</small>, <code>sqbr</code>, <code>comma</code>, <code>or</code>, <code>br</code>, <code>x{{!}}…</code>:
+* <code><nowiki>{{convert|10|m|ft|disp=sqbr}}</nowiki></code> → {{convert|10|m|ft|disp=sqbr}}
+* <code><nowiki>{{convert|10|m|ft|disp=comma}}</nowiki></code> → {{convert|10|m|ft|disp=comma}}
+* <code><nowiki>{{convert|10|m|ft|disp=or}}</nowiki></code> → {{convert|10|m|ft|disp=or}}
+Default behaviour, for comparison:
+* <code><nowiki>{{convert|10|m|ft}}</nowiki></code> → {{convert|10|m|ft}}
+Setting {{para|disp|br}} will force a new line (<code>&lt;br/></code>)
+* <code><nowiki>{{convert|10|m|ft|disp=br}}</nowiki></code> → {{convert|10|m|ft|disp=br}}
+Also {{para|disp|br()}} will force a new line, and keep the brackets (useful in tables):
+* <code><nowiki>{{convert|10|m|ft|disp=br()}}</nowiki></code> → {{convert|10|m|ft|disp=br()}}
+Setting {{para|disp|x{{!}}…}} allows any text as separator:
+* <code><nowiki>{{convert|10|m|ft|disp=x|_MyText_}}</nowiki></code> → {{convert|10|m|ft|disp=x|_MyText_}} <small>(To display spaces, use <code>&amp;nbsp;</code>)</small>
+<!--todo: works for multiple freetexts too! |disp=x|TextA|TextB -->
+===<span id="flip"></span>Flipping (reordering) the two measurements: ''{{convert|1|mi|m|order=flip|sigfig=5|abbr=off}}'' ===
+Setting {{para|order|flip}} will flip (swap) the two measurements:
+* <code><nowiki>{{convert|1|mi|m|order=flip}}</nowiki></code> → {{convert|1|mi|m|order=flip|sigfig=5|abbr=off}}<!-- Extra settings added to enhance the illustration. Don't know if this is ideal way of documenting. DePiep, August 2014. -->
+Default behaviour, for comparison:
+* <code><nowiki>{{convert|1|mi|m}}</nowiki></code> → {{convert|1|mi|m|sigfig=5|abbr=off}}
+When converting to multiple units, the effect is:
+* <code><nowiki>{{convert|10|km|mi nmi|order=flip}}</nowiki></code> → {{convert|10|km|mi nmi|order=flip|sigfig=5|abbr=off}}
+* <code><nowiki>{{convert|10|km|nmi mi|order=flip}}</nowiki></code> → {{convert|10|km|nmi mi|order=flip|sigfig=5|abbr=off}}
+===Fixed ordering of output units: ''{{convert|100|C|F C K|abbr=on|order=out}}'' ===
+Setting {{para|order|out}} shows the output-units as ordered; the input unit is skipped:
+*<code><nowiki>{{convert|100|C|F C K|abbr=on|order=out}}</nowiki></code> &rarr; {{convert|100|C|F C K|abbr=on|order=out}}
+*<code><nowiki>{{convert|200|PS|kW hp|0|abbr=on|order=out}}</nowiki></code> → {{convert|200|PS|kW hp|0|abbr=on|order=out}}
+''See also: [[Template:Convert#Displaying_parts_of_the_result:_2_(1.5)|§ Displaying parts of the output]]''.
+=== Displaying parts of the result: ''{{convert|2|cuyd|m3|abbr=values}}''===
+It is possible to display only parts of the conversion result:
+<!-- todo: describe effect of order=flip ("out" means 1st or 2nd measurement?) -->
+{| class="wikitable"
+! Convert !! Output !! Returns
+|-
+| <code><nowiki>{{convert|2|cuyd|m3}}</nowiki></code> || {{convert|2|cuyd|m3}}
+| Regular output (for comparison)
+|-
+| <code><nowiki>{{convert|2|cuyd|m3|abbr=values}}</nowiki></code>
+| {{convert|2|cuyd|m3|abbr=values}} || Input and output numbers
+|-
+| <code><nowiki>{{convert|2|cuyd|m3|disp=unit}}</nowiki></code> || {{convert|2|cuyd|m3|disp=unit}}
+| Input unit
+|-
+| <code><nowiki>{{convert|2|cuyd|m3|disp=unit|adj=on}}</nowiki></code> || {{convert|2|cuyd|m3|disp=unit|adj=on}}
+| Input unit, adjective (hyphenated)
+|-
+| <code><nowiki>{{convert|2|cuyd|cuyd|disp=out}}</nowiki></code> || {{convert|2|cuyd|cuyd|disp=out}} || Input (''workaround''. {{nowrap|1=Note repetition of unit in input}})
+|-
+| <code><nowiki>{{convert|2|cuyd|m3|abbr=~}}</nowiki></code> || {{convert|2|cuyd|m3|abbr=~}}
+| Input: both name and symbol
+|-
+| <code><nowiki>{{convert|2|cuyd|m3|disp=unit2}}</nowiki></code> || {{convert|2|cuyd|m3|disp=unit2}} || Output unit (symbol)
+|-
+| <code><nowiki>{{convert|2|cuyd|m3|disp=unit2|abbr=off}}</nowiki></code> || {{convert|2|cuyd|m3|disp=unit2|abbr=off}} || Output unit (name)
+|-
+| <code><nowiki>{{convert|2|cuyd|m3|disp=number}}</nowiki></code> || {{convert|2|cuyd|m3|disp=number}}
+| Output value
+|-
+| <code><nowiki>{{convert|2|cuyd|m3|disp=out}}</nowiki></code> || {{convert|2|cuyd|m3|disp=out}}
+| Output value and unit name
+|-
+| <code><nowiki>{{convert|2|cuyd|m3|disp=out|abbr=off}}</nowiki></code> || {{convert|2|cuyd|m3|disp=out|abbr=off}}
+| Output value and unit symbol
+|}
+===Display both input name and symbol: ''2 kilopascals [kPa]''===
+Setting {{para|abbr|~}} returns both name and  symbol of the first (input) unit:
+* <code><nowiki>{{convert|2|kPa|psi|abbr=~}}</nowiki></code> → {{convert|2|kPa|psi|abbr=~}}
+* <code><nowiki>A {{convert|2|kPa|psi|abbr=~|adj=on}} pressure</nowiki></code> → {{nowrap|A {{convert|2|kPa|psi|abbr=~|adj=on}} pressure}}
+==Table options==
+For the [[Help:Table/Manual tables|wikitable]] structure, there are three options: add a line-break, split the result over columns and make the table sortable.
+===Enforced line break===
+{{para|disp|br}} adds a line-break and omits brackets.
+{{para|disp|br()}} adds a line-break and does add brackets to the converted value. This may be useful in tables:
+{| class=wikitable
+! {{para|disp|br}} !! {{para|disp|br()}}
+|-
+|{{convert|100|km|mi|disp=br}}
+|{{convert|100|km|mi|disp=br()}}
+|}
+===Table columns ===
+Using {convert} in a table cell, with {{para|disp|table}} splits the result over two (or more) columns. By default units are not included in the table, however, they can be added using the {{para|abbr|}} parameter. Multiple-unit outputs, like <code>ftin</code>, always output their units to the table.
+:<code><nowiki>{{convert|10|m|ft|disp=table}}</nowiki></code> →
+<code>{{convert|10|m|ft|disp=table}}</code>
+{{para|disp|tablecen}} does the same, and also centers the text:
+:<code><nowiki>{{convert|20|m|ft|disp=tablecen}}</nowiki></code> →
+<code>{{convert|20|m|ft|disp=tablecen}}</code>
+The units are added as a column header:
+:{| class=wikitable
+! style="width:10em;" | &nbsp;
+! style="width:10em;" | kilograms
+! style="width:10em;" | pounds
+! style="width:10em;" | stone and pounds
+|-
+| {{para|disp|table}}
+| {{convert|10|kg|lb stlb|disp=table}}
+|-
+|{{para|disp|table}} and {{para|abbr|on}}
+| {{convert|20|kg|lb stlb|disp=table|abbr=on}}
+|-
+|{{para|disp|table}} and {{para|abbr|off}}
+| {{convert|30|kg|lb stlb|disp=table|abbr=off}}
+|-
+|{{para|disp|tablecen}}
+| {{convert|40|kg|lb stlb|disp=tablecen}}
+|-
+|{{para|disp|&lt;other>}} <small>(default)</small>
+|{{convert|50|kg|lb stlb|disp=}}
+|-
+|}
+===Sorting===
+Use {{para|sortable|on}} to include a ''hidden numerical sortkey'' in the output, suitable for use in a [[Help:Sorting|table with sortable columns]]. Technically, this places a hidden string before the actual displayed values:
+:<code><nowiki>{{convert|10|m|ft|sortable=on}}</nowiki></code> {{nowrap|1=→ <code>&lt;span data-sort-value="7001100000000000000♠">&lt;/span>10 metres (33&nbsp;ft)</code>}}
+:showing: {{convert|10|m|ft|sortable=on}}.
+Use both {{para|disp|table}} and {{para|sortable|on}} together to produce table columns (pipe symbols) for each value in sortable columns:
+:{| class="wikitable sortable"
+!
+! m
+! ft
+|-
+| A
+| {{convert|15+3/4|m|ft|disp=table|sortable=on}}
+|-
+| B
+| {{convert|15.5|m|ft|disp=table|sortable=on}}
+|-
+| C
+| {{convert|16.0|m|ft|disp=table|sortable=on}}
+|-
+| D
+| {{convert|16|m|ft|disp=table|sortable=on}}
+|}
+The generated sortkey is calculated in a consistent way based on both the value and its unit as passed to the convert template. In most cases convert uses the passed value converted to SI base units. It is therefore not necessarily the displayed value or other alternate units and is calculated regardless of output format options. Using different units or different order of units in individual rows should therefore not lead to incorrect sorting, although variations in rounding can give surprising results, since an unrounded number is used for the sortkey.
+==Units==
+The conversion factors and physical constants are sourced [[Module:Convert/documentation/conversion data introduction/doc#Conversion factors and physical constants|here]].
+===All units===
+{{selfref|See also: [[Template:Convert/list of units|Convert/list of units]]}}
+{{hatnote|Units are case-sensitive: use {{xt|kW}}, not {{!xt|KW}} or {{!xt|kw}}}}
+{{Convert/list of units}}
+==={{anchor|per}}'per' units: ''kg/hl'', ''miles per gallon''===
+When using a slash (<code>/</code>), a unit like <code>kg/hl</code> is recognized as kilograms ''per'' hectolitre and will be converted with other mass/volume units.
+* <code><nowiki>{{convert|1000|kg/hl}}</nowiki></code> → {{convert|1000|kg/hl}}
+Population density (''inhabitants per square mile'') can be converted using
+* <code><nowiki>{{convert|10|PD/sqmi|PD/km2}}</nowiki></code> → {{convert|10|PD/sqmi|PD/km2}}
+Vehicular fuel efficiency, commonly expressed in ''miles per gallon'' or ''litres per 100 km'' can also be converted
+* <code><nowiki>{{convert|26|mpgUS|l/100km mpgimp}}</nowiki></code> → {{convert|26|mpgUS|l/100km mpgimp}}
+==={{anchor|Units of difference}}Units of difference: Expressing a change or difference in temperature===
+We have already discussed standard temperature conversions (°C, °F, K), as shown in these two examples:
+* {{#invoke:DemoTemplate|convert|10|C}} (standard temperature conversion)
+* {{#invoke:DemoTemplate|convert|10–15|C}} (standard temperature range conversion)
+When expressing a temperature ''change'' (e.g., "The temperature ''increased'' by 10&nbsp;°C"), or when ''comparing'' temperatures (e.g., "10 to 15&nbsp;°C ''warmer''"), we cannot use the standard temperature units ({{para||C}}, {{para||F}} and {{para||K}}), which refer to points on the respective scale. Instead, we must use one of the following "units of difference": {{para||C-change}}, {{para||F-change}} and {{para||K-change}}.
+Compare the following two examples with the two above:
+* {{#invoke:DemoTemplate|convert|10|C-change}} increase in temperature
+* {{#invoke:DemoTemplate|convert|10–15|C-change}} warmer than normal
+To produce multiple units in the output:
+* {{#invoke:DemoTemplate|convert|10|C-change|F-change K-change}} difference
+===Multiple units: ''1 ft 5 in''===
+====In input====
+Base document {{slink|Module:Convert/documentation/conversion data/doc|Input multiples|nopage=y}} lists options for ''multiple unit input'' (like <code>ft,in</code>). It can catch predefined sets only (units that can be subdivided; e.g., yd into ft):
+* <code><nowiki>{{convert|1|yd|2|ft|3|in}}</nowiki></code> → {{convert|1|yd|2|ft|3|in}}
+* <code><nowiki>{{convert|2|ft|3|in|cm}}</nowiki></code> → {{convert|2|ft|3|in|cm}}
+* <code><nowiki>{{convert|1|lb|5|oz|g}}</nowiki></code> → {{convert|1|lb|5|oz|g}}
+====In output====
+Available multiple-unit output options predefined, like <code>ftin</code> and <code>ydftin</code>. The full list is at {{slink|Module:Convert/documentation/conversion data/doc|Output multiples|nopage=y}}.
+* <code><nowiki>{{convert|2|m|ftin}}</nowiki></code> → {{convert|2|m|ftin}}
+* <code><nowiki>{{convert|2|m|ft in}}</nowiki></code> → {{convert|2|m|ft in}}, using a space, returns the decimal point
+Default behaviour, for comparison:
+* <code><nowiki>{{convert|2|m}}</nowiki></code> → {{convert|2|m}}
+See also:
+* {{tl|hands}} a length used to measure horses
+* {{tl|Long ton}} a weight in ton, cwt, qr and lb
+<!-- todo: mention the 0-3 limits -->
+===Currency per unit: ''$/mi &rarr; $/km''===
+Using currency symbols in a ''$ per unit'' value, you can convert the per-unit:
+* <code><nowiki>{{convert|10|$/mi|$/km}}</nowiki></code> → {{convert|10|$/mi|$/km}}
+* <code><nowiki>{{convert|1500|$/ozt|$/g}}</nowiki></code> → {{convert|1500|$/ozt|$/g}}
+You can set the currency in ''both'' values using {{para|$|€}}:
+* <code><nowiki>{{convert|10|$/mi|$/km|$=€}}</nowiki></code> → {{convert|10|$/mi|$/km|$=€}}
+It is ''not'' possible to convert the currency. So, this result (mixed currencies) is ''not'' possible: {{!mxt|1=$15 per mile (€8.6/km)}} {{nay}}
+==Using convert inside templates==
+For usage in template code, like infoboxes, {{tlf|Convert}} has these options:
+;Pre-formatting fraction input
+* [[Module:Convert/helper]] can read regular input and pre-format it into {{tlf|Convert}}-accepted input.
+:Your template can accept {{para|input|16 7/8}} and use <nowiki>{{#invoke:Convert/helper|number|16 7/8}}</nowiki> &rarr; {{#invoke:Convert/helper|number|16 7/8}}
+;Using a Wikidata property
+* Adding the Wikidata property code, like code {{para|input|P2073}}, to your template code automatically returns the Wikidata property for that article, and convert it. Both number and unit are read.
+Note: to return that property value for an ''other'' article, use {{para|qid}}.
+Example for {{Wikidata property link|P2073}}:
+Note: this example uses {{para|qid|Q1056131}} (testing for {{Wikidata entity link|Q1056131}})
+* <code><nowiki>{{convert|input=P2073|qid=Q1056131|ftin|abbr=on}}</nowiki></code>  &rarr; {{convert|input=P2073|qid=Q1056131|ftin|abbr=on}}
+* <code><nowiki>{{convert|input=P2073|qid=Q1056131|km|abbr=on}}</nowiki></code>  &rarr; {{convert|input=P2073|qid=Q1056131|km|abbr=on}}
+* <code><nowiki>{{convert|input=P2073|qid=Q1056131|km|abbr=on|disp=out}}</nowiki></code>  &rarr; {{convert|input=P2073|qid=Q1056131|km|abbr=on|disp=out}}
+:For example see [[template:Infobox Telescope]].
+Sometimes a property may have more than one value against it in Wikidata. You can use the {{para|qual}} parameter to specify which of the values you want to use.
+Example for {{Wikidata property link|P2386}}:
+Note: this example uses {{para|qid|Q1513315}} (testing for {{Wikidata entity link|Q1513315}})
+* {{Wikidata entity link|Q613628}}: <code><nowiki>{{convert|input=P2386|qual=Q613628|ft|abbr=on}}</nowiki></code> → {{convert|input=P2386|qid=Q1513315|qual=Q613628|ft|abbr=on}}
+* {{Wikidata entity link|Q1395645}}: <code><nowiki>{{convert|input=P2386|qual=Q1395645|ft|abbr=on}}</nowiki></code> → {{convert|input=P2386|qid=Q1513315|qual=Q1395645|ft|abbr=on}}
+==Parameter list==
+{{convert/doc/parameter list}}
+==Deprecated options==
+{{Convert/doc/deprecations list}}
+==TemplateData==
+{{TemplateDataHeader}}
+<templatedata>
+{
+	"description": "Converts measurements to other units.",
+	"params": {
+		"1": {
+			"label": "Value",
+			"description": "The value to convert.",
+			"type": "number",
+			"required": true
+		},
+		"2": {
+			"label": "From unit",
+			"description": "The unit for the provided value.",
+			"type": "string",
+			"example": "km",
+			"required": true
+		},
+		"3": {
+			"label": "To units",
+			"description": "The units to convert into. Separate units by a space for multiple outputs. In an output unit, use + for a multiplication space.",
+			"type": "string",
+			"example": "mi nmi",
+			"suggested": true
+		},
+		"4": {
+			"label": "Precision or suffix",
+			"description": "Significant digits after decimal dot or, if negative, exponent of ten.",
+			"type": "number"
+		},
+		"lk": {
+			"label": "Link units",
+			"description": "Indication of what units to apply wikilinks to. Use “on” for all, “in” for the input unit, “out” for the output units, or “off” for none of the units.",
+			"default": "off",
+			"type": "string",
+			"example": "on"
+		},
+		"abbr": {
+			"label": "Abbreviation",
+			"description": "Display for the units: “on” to display all units using their unit symbols, “off” to display all units in full words, “in” to display the unit symbol for the input unit, “out” to display the unit symbols for the output units, “unit” to display unit symbols for both input and output units when using scientific notation, “values” for no units at all (neither unit symbols nor full words of units).",
+			"default": "out",
+			"type": "string",
+			"example": "on, unit, in, out, off",
+			"suggested": true
+		},
+		"sp": {
+			"label": "Spelling",
+			"description": "Spelling of units. Use “us” to display unit names using U.S. spelling.",
+			"type": "string",
+			"example": "us"
+		},
+		"adj": {
+			"label": "Adjective",
+			"description": "Whether to use adjectival form. Use “on” for singular unit name appended by a hyphen, “mid” to put conversion at end, or “off” (default) for no adjectival form.",
+			"type": "unbalanced-wikitext",
+			"example": "on",
+			"default": "off"
+		},
+		"disp": {
+			"label": "Conversion",
+			"description": "Display conversion result: “or”: after ‘or’, “x”: with custom prefix and suffix, “b”: in parentheses, “table”/“tablecen”, “output only”: alone, “output number only”: alone and without unit, “unit”: not at all but input unit; if the value is a number it is used as precision.",
+			"type": "string",
+			"example": "b"
+		},
+		"order": {
+			"label": "Ordering",
+			"description": "“flip” returns converted value first, input value second.",
+			"type": "string",
+			"example": "flip"
+		},
+		"sigfig": {
+			"label": "Significant figures",
+			"description": "Indicates the number of significant figures to be used in rounding.",
+			"type": "number"
+		},
+		"round": {
+			"label": "Rounding output",
+			"description": "The type of rounding. “5” rounds the output number to nearest multiple of 5, “25” to nearest multiple of 25, “each” rounds each number in a range.",
+			"type": "number"
+		},
+		"comma": {
+			"label": "Thousands separator",
+			"description": "Sets or suppresses the use of thousands separators in the numbers. “off”: no separator; “gaps”: use space instead of comma as thousands separator; “5”: only add thousands separator when the integral part of the number uses 5 positions or more (10,000 or more; if using comma as thousands separator, 1234 would produce '1234', 12345 would produce '12,345').",
+			"default": "on",
+			"type": "string",
+			"example": "off"
+		},
+		"sortable": {
+			"label": "Sort key",
+			"description": "“on” generates a hidden sort key",
+			"type": "string",
+			"example": "on"
+		},
+		"spell": {
+			"label": "Spell numbers?",
+			"description": "If used, spells input or input and output numbers in words, optionally capitalizing the first",
+			"example": "'in', 'In', 'on', or 'On'",
+			"type": "string"
+		},
+		"sing": {
+			"type": "string",
+			"deprecated": "use adj=",
+			"label": "Singular?",
+			"description": "If 'yes', uses singular form of units (deprecated)",
+			"example": "yes"
+		},
+		"frac": {
+			"label": "Fraction?",
+			"description": "fraction as rounding unit",
+			"type": "number"
+		},
+		"$": {
+			"label": "Currency symbol",
+			"description": "sets currency symbol in both units",
+			"example": "$=€ will show \" €10 per mile (€6.2/km)\"",
+			"type": "string"
+		},
+		"input": {
+			"label": "WD property",
+			"description": "Reads the property value of the item (article), then converts it",
+			"example": "{{convert|input=P2046}} (P2046=area)",
+			"type": "string"
+		}
+	},
+	"format": "inline"
+}
+</templatedata>
+<!--''to be added''
+==Glossary==
+;unit code
+:
+;unit symbol
+:
+-->
+==See also==
+* {{Temp|Cvt}}
+* {{Temp|SI units}}
+* {{Temp|Inflation}} to convert historical prices to their current equivalent.
+{{Convert navs}}
 <noinclude>
-<!-- Documentation categories/interwiki here -->
+[[Category:Convert by module documentation| ]]
-</noinclude>
+</noinclude><includeonly>{{#ifeq:{{SUBPAGENAME}}|doc||
+[[Category:Convert templates| ]]
+[[Category:Conversion templates]]
+[[Category:Numbers as words conversion templates]]
+[[Category:Sorting templates]]
+}}</includeonly>

Difference between revisions of "Template:Convert/doc"

Revision as of 17:55, 29 February 2020

Contents

Units to convert

Unit name or symbol (abbreviation): 1 pound or 1 lb?

Convenience: Template:Tlf has |abbr=on by default

Adjective: a 10-mile distance

Template:AnchorRounding: 100 ft is 30 m or 30.5 m or 30.48 m?

Default rounding

Round to a given precision: use a precision number

Round to a given number of significant figures: |sigfig=

Round to a multiple of 5: 15, 20, 25, ...

Round to a multiple of a given fraction: Template:Frac inch

Template:AnchorRounding temperatures: °C, °F and K

Rounding input

Into multiple units: 10 °C (Expression error: Missing operand for *. )

Ranges of values

A range: 6 to 17 kg (13 to 37 lb)

Multiple dimensions: 6 (Expression error: Unexpected round operator. )

Lists of values: 20, 40, or 60 miles

About feet, inch in ranges and multiples

Words

Spelling of unit name: international metre or US meter?

Spell out numbers: ten miles

Inserted before units: 4 planted acres

After adjective unit: A 10 feetExpression error: Unexpected round operator. ft corridor

Plurals: 1 inch, 2 inches

Fractions: one-eighth of an imperial pint

Wrapping and line breaking

Spelling out "thousands", "millions", etc.

Numbers

Using an SI prefix: gigametre (Gm), or micrometre (μm)

Engineering notation: 7 × 106 m

In the unit: e6m

Scientific notation: 1.23 × 10−14

Input with fractions: 1+1/2 inches (13.7 mm)

Horizontal fraction bar: Template:Sfrac inch

Thousands separator: 1,000 mi or 1000 mi

Output manipulation

Brackets and separators: 10 m [33 ft]

Flipping (reordering) the two measurements: 1 mile (1,609.344 m)

Fixed ordering of output units: 100 °C (Expression error: Missing operand for *. )

Displaying parts of the result: 2 (Expression error: Missing operand for *. )

Display both input name and symbol: 2 kilopascals [kPa]

Table options

Enforced line break

Table columns

Sorting

Units

All units

Template:Anchor'per' units: kg/hl, miles per gallon

Template:AnchorUnits of difference: Expressing a change or difference in temperature

Multiple units: 1 ft 5 in

In input

In output

Currency per unit: $/mi → $/km

Using convert inside templates

Parameter list

Deprecated options

TemplateData

See also

Navigation menu

Search

Convenience: Template:Tlf has `|abbr=on` by default

Round to a given number of significant figures: `|sigfig=`

Into multiple units: *10 °C (**Expression error: Missing operand for *.** )*

Engineering notation: 7 × 10⁶ m

Scientific notation: 1.23 × 10⁻¹⁴

Fixed ordering of output units: *100 °C (**Expression error: Missing operand for *.** )*

Displaying parts of the result: *2 (**Expression error: Missing operand for *.** )*