Template:Convert/doc

From Festipedia, hosted by the FR Heritage Group

Template {{convert}} calculates a measurement value (number × unit) into the same measurement by a different unit, and then presents the results, formatted.

For example:

{{convert|2|km|mi}} → 2 kilometres (1.2 mi) (km entered, converted into miles)
{{convert|7|mi|km}} → 7 miles (11 km) (mi entered, 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 to 5 kilometres (1.2 to 3.1 mi)
{{convert|2|-|5|km|mi}} → 2–5 kilometres (1.2–3.1 mi)

Combined effect example:

{{convert|2|-|5|km|mi|2|abbr=on}} → 2–5 km (1.24–3.11 mi)
{{convert|2|and|5|km|mi|sigfig=3|abbr=off}} → 2 and 5 kilometres (1.24 and 3.11 miles)

Units to convert[edit]

Enter units to convert from into:

  • {{convert|1|lb|kg}} → 1 pound (0.45 kg)
SI units generally accept prefixes, like "m" for milli (10−3), and "M" for mega (106)
For "per" units, use "/" (slash): kg/ha (see § 'per' units: kg/ha and § Currency per unit: $/km)

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

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

  • {{convert|1|lb|kg}} → 1 pound (0.45 kg)

Using |abbr=in shows the symbol for first (left-hand side) unit, and the name instead of the symbol for the second unit:

  • {{convert|1|lb|kg|abbr=in}} → 1 lb (0.45 kilograms)

To abbreviate both or neither:

  • {{convert|1|lb|kg|abbr=on}} → 1 lb (0.45 kg)
  • {{convert|1|lb|kg|abbr=off}} → 1 pound (0.45 kilograms)

Adjective: a 10-mile distance[edit]

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

  • A {{convert|10|mi|km|adj=on}} distance → A 10-mile (16 km) distance.

Default behavior, for comparison:

  • {{convert|10|mi|km}} to go → 10 miles (16 km) to go.

|adj=on does not produce hyphens with unit symbols:

  • A {{convert|9|in|cm|adj=on|abbr=on}} nail → A 9 in (23 cm) nail.

Rounding: 100 ft is 30 m or 30.5 m or 30.48 m?[edit]

By definition, 100 ft equals 30.48 m. In practical use, it is common to round the calculated metric number. With that, there are several possibilities.

Default rounding[edit]

By {{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 below).

Examples of rounding
Input Displays as Note
{{convert|123|ft|m|-1}} 123 feet (40 m)
{{convert|123|ft|m}} 123 feet (37 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) 123 feet is exactly 37.4904 m which is rounded 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 (150 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 (152.40 m) exact value is 152.4 m
{{convert|500|ft|cm|-3}} 500 feet (15,000 cm)
{{convert|500|ft|cm}} 500 feet (15,000 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[edit]

Specify the desired precision with an integer as 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 110 to the power of this integer. For instance, if the result is 8621 and the rounding parameter is "−2", 8600 will be displayed. If the result is "123.456" and the parameter is "0", 123 will be displayed. Essentially a positive or zero rounding parameter specifies the number of decimal places; a negative value specifies the number of trailing zeroes.

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

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

  • {{convert|1200|ft|m|sigfig=4}} → 1,200 feet (365.8 m)
  • {{convert|1200|ft|m|sigfig=3}} → 1,200 feet (366 m)
  • {{convert|1200|ft|m|sigfig=2}} → 1,200 feet (370 m)
  • {{convert|1200|ft|m|sigfig=1}} → 1,200 feet (400 m)

Default behavior, for comparison:

  • {{convert|1200|ft|m}} → 1,200 feet (370 m)

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

  • {{convert|1200|ft|m|sigfig=0}} → 1,200 feet (370 m)* Red XN

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

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

  • {{convert|10|m|ft}} → 10 metres (33 ft)
  • {{convert|10|m|ft|round=5}} → 10 metres (35 ft)

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

  • {{convert|10|m|ft}} → 10 metres (33 ft)
  • {{convert|10|m|ft|round=25}} → 10 metres (25 ft)

Default behavior, for comparison:

  • {{convert|10|m|ft|sigfig=4}} → 10 metres (32.81 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 by 200 by 3,000 metres (33 ft × 656 ft × 9,843 ft)
  • {{convert|10 x 200 x 3000|m|ft|round=each}} → 10 by 200 by 3,000 metres (33 ft × 660 ft × 9,800 ft)

Round to a multiple of a given fraction: 2+316 inch[edit]

Specify the desired denominator using |frac=<some positive integer>. (Denominator is the below-the-slash number, for example the 3 in 13).

  • {{convert|5.56|cm|in|frac=16}}5.56 centimetres (2+316 in)
  • {{convert|8|cm|in|frac=4}}8 centimetres (3+14 in)

The fraction is reduced when possible:

  • {{convert|8|cm|in|frac=100}}8 centimetres (3+320 in)

Default behavior uses decimal notation:

  • {{convert|5.56|cm|in}} → 5.56 centimetres (2.19 in)

Rounding temperatures: °C, °F and K[edit]

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.

  1. {{convert|10,000|C|F K}} → 10,000 °C (18,000 °F; 10,300 K)
  2. {{convert|10,000.1|C|F K}} → 10,000.1 °C (18,032.2 °F; 10,273.2 K)
  3. {{convert|-272|C|F K}} → −272 °C (−457.60 °F; 1.15 K)
  4. {{convert|-272|C}} → −272 °C (−457.60 °F)
  5. {{convert|100|C|F K}} → 100 °C (212 °F; 373 K)
  6. {{convert|0|C|F K}} → 0 °C (32 °F; 273 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 degrees Celsius change is a 0.18 degrees Fahrenheit change, 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=:

{{convert|10000|C|sigfig=5}} → 10,000 °C (18,032 °F)

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

{{convert|10000|C|0}} → 10,000 °C (18,032 °F)

The precision of the input number in example (2) is six, so the precision of the Fahrenheit output is six now, 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 the 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[edit]

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 {{#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:

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

Note that it is not possible to round above the decimal place (|adj=ri-1Red XN is invalid). Neither is there support for significant figures, multiples of a number, or any other output-rounding feature.

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

  • {{convert|4.14159|mi|km|adj=ri0}} → 4 miles (6.66524 km) Red XN (precisions are mismatched)
  • {{convert|4.14159|mi|km|0|adj=ri0}} → 4 miles (7 km) Green tickY

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

  • {{convert|{{#expr:4.14159 round 0}}|mi|km|0}} → 4 miles (6 km) Red XN (rounds intermediate calculation, giving a different result)

Into multiple units: 10 °C (50 °F; 283 K)[edit]

Separate the multiple output units by a space:

  • {{convert|10|C|F K}} → 10 °C (50 °F; 283 K)
  • {{convert|5|km|mi nmi}} → 5 kilometres (3.1 mi; 2.7 nmi)

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

See also:

Ranges of values[edit]

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)[edit]

Range indicators are entered as the second parameter (between the values). Range separators can be:

Range separators in {{convert}}
Separator Convert Result Notes
- {{convert|3|-|6|ft}} 3–6 feet (0.91–1.83 m) Input can be hyphen (-) or en dash (–), output uses en dash
 &ndash; (en dash) {{convert|3|–|6|ft}} 3–6 feet (0.91–1.83 m)
and {{convert|3|and|6|ft}} 3 and 6 feet (0.91 and 1.83 m)
and(-) {{convert|3|and(-)|6|ft}} 3 and 6 feet (0.91–1.83 m) |abbr=on abbreviates the first unit
and(-)|abbr=on {{convert|3|and(-)|6|ft|abbr=on}} 3 and 6 ft (0.91–1.83 m)
or {{convert|3|or|6|ft}} 3 or 6 feet (0.91 or 1.83 m)
to {{convert|3|to|6|ft}} 3 to 6 feet (0.91 to 1.83 m)
to(-) {{convert|3|to(-)|6|ft}} 3 to 6 feet (0.91–1.83 m) |abbr=on abbreviates the first unit
to(-)|abbr=on {{convert|3|to(-)|6|ft|abbr=on}} 3 to 6 ft (0.91–1.83 m)
to about {{convert|3|to about|6|ft}} 3 to about 6 feet (0.91 to about 1.83 m)
+/- {{convert|3|+/-|6|ft}} 3 ± 6 feet (0.91 ± 1.83 m)
± &plusmn; {{convert|3|±|6|ft}} 3 ± 6 feet (0.91 ± 1.83 m)
+ {{convert|3|+|6|ft}} 3 + 6 feet (0.91 + 1.83 m)
, {{convert|3|,|6|ft}} 3, 6 feet (0.91, 1.83 m)
, and {{convert|3|, and|6|ft}} 3, and 6 feet (0.91, and 1.83 m)
, or {{convert|3|, or|6|ft}} 3, or 6 feet (0.91, or 1.83 m)
by {{convert|3|by|6|ft}} 3 by 6 feet (0.91 by 1.83 m)
x {{convert|3|x|6|ft}} 3 by 6 feet (0.91 m × 1.83 m) |abbr=on abbreviates and repeats the first unit
× &times; {{convert|3|×|6|ft}} 3 by 6 feet (0.91 m × 1.83 m)
x|abbr=on {{convert|3|x|6|ft|abbr=on}} 3 ft × 6 ft (0.91 m × 1.83 m)
xx |xx| is deprecated. Use |x| instead
* |*| is deprecated. Use |x| instead

Multiple dimensions: 6 m × 12 m (20 ft × 39 ft)[edit]

Use by:

  • {{convert|6|by|12|ft|m}} → 6 by 12 feet (1.8 by 3.7 m)

Use ×, multiplication sign, or x, letter:

  • {{convert|6|x|12|m|ft}} → 6 by 12 metres (20 ft × 39 ft)

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 m × 12 m (20 ft × 39 ft)

Lists of values: 20, 40, or 60 miles[edit]

{{convert|20|,|40|, or|60|mi}} → 20, 40, or 60 miles (32, 64, or 97 km)

About feet, inch in ranges and multiples[edit]

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

Default behavior, for comparison:

  • {{convert|1|ft|3|in|mm}} → 1 foot 3 inches (380 mm)

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

  • {{convert|380|x|1040|mm|ftin|order=flip}} → 1 foot 3 inches by 3 feet 5 inches (380 mm × 1,040 mm)

Words[edit]

Spelling of unit name: international metre or US meter?[edit]

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

{{convert|1|m|ft}} → 1 metre (3.3 ft)—default
{{convert|1|m|ft|sp=us}} → 1 meter (3.3 ft)

Spell out numbers: ten miles[edit]

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

  • {{convert|10|mi|m|spell=in}} → ten miles (16,000 m)

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

  • {{convert|10|mi|m|spell=on}} → ten miles (sixteen thousand metres)

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

  • {{convert|10|mi|m|spell=In}} → Ten miles (16,000 m)
  • {{convert|10|mi|m|spell=On}} → Ten miles (sixteen thousand metres)

Inserted before units: 4 planted acres[edit]

  • {{convert|4|acre||adj=pre|planted}} → 4 planted acres (1.6 ha)

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 planted acres (1.6 planted ha)
  • {{convert|4|acre||disp=preunit|planted |reforested-}} → 4 planted acres (1.6 reforested-ha)

After adjective unit: A 10-foot-long corridor[edit]

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-foot-long (3.0 m)

Plurals: 1 inch, 2 inches[edit]

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

  • {{convert|1|metre}} → 1 metre (3 ft 3 in)
  • {{convert|2|metre}} → 2 metres (6 ft 7 in)
  • {{convert|2|metre|abbr=on}} → 2 m (6 ft 7 in)
Exception

Entering the unit "foot" instead of "ft" forces singular output "foot", whatever the number is.

  • {{convert|100|foot|abbr=off}} → 100 foot (30 metres)

Fractions: one-eighth of an imperial pint[edit]

The convert template also supports spelling out fractions.

  • {{convert|3+1/2|oz|g|spell=in}} → three and a half ounces (99 g)

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}} → one-eighth of an imperial pint (71 ml)

Wrapping and line breaking[edit]

See w:Help:Convert § Wrapping and line breaking

Spelling out "thousands", "millions", etc.[edit]

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

  • {{convert|100|e6mi|e6km}} → 100 million miles (160×10^6 km)
  • {{convert|120|e6acre}} → 120 million acres (490,000 km2)
  • {{convert|120|e6acre|e3km2}} → 120 million acres (490×10^3 km2)

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

  • {{convert|100|e6mi|e6km|abbr=on}} → 100×10^6 mi (160×10^6 km)

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 million mi (160 million km)
  • {{convert|100|e6mi|e6km|abbr=off}} → 100 million miles (160 million kilometres)

Numbers[edit]

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

Metric prefixes
Text Symbol Factor
quetta Q 1030
ronna R 1027
yotta Y 1024
zetta Z 1021
exa E 1018
peta P 1015
tera T 1012
giga G 109
mega M 106
kilo k 103
hecto h 102
deca da 101
(none)  1
deci d 10−1
centi c 10−2
milli m 10−3
micro μ 10−6
nano n 10−9
pico p 10−12
femto f 10−15
atto a 10−18
zepto z 10−21
yocto y 10−24
ronto r 10−27
quecto q 10−30

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 Gm (1.2×1010 m)
  • 12 μm (1.2×10−5 m)

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

  • {{convert|12|Gm|mi|abbr=on}} → 12 Gm (7,500,000 mi)
  • Mm: 12 Mm (7,500 mi)
  • km: 12 km (39,000 ft)
  • mm: 12 mm (0.47 in)
  • μm: 12 μm (0.012 mm)
  • um: 12 μm (0.012 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 (19 Mm)
  • {{convert|12|in|μm|abbr=on}} → 12 in (300,000 μm)

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

  • {{convert|12|μm|μin|abbr=on}} → 12 μm (470 μin)

Engineering notation: 7 × 106 m[edit]

In the unit: e6m[edit]

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

  • {{convert|70|e6m}} → 70×10^6 m (230,000,000 ft)

The same is possible for the output unit:

  • {{convert|23,000,000|ft|e6m}} → 23,000,000 feet (7.0×10^6 m)

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[edit]

With {{convert}}, 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}} → 12.3×10−15 atm (1.23×10−14 atm)
  • {{convert|0.00000005|atm|atm|abbr=on}} → 0.00000005 atm (5.0×10−8 atm)

Input with fractions: 1+12 inches (38.1 mm)[edit]

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

  • {{convert|1/2|in|mm|1}}12 inch (12.7 mm)
  • {{convert|1⁄2|in|mm|1}}12 inch (12.7 mm)

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

  • {{convert|2+1⁄2|in|mm|1}}2+12 inches (63.5 mm)

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

  • {{convert|-2-1⁄2|in|mm|1}}−2+12 inches (−63.5 mm)

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

  • {{convert|2-1⁄2|in|mm|1}}2–12 inch (50.8–12.7 mm). This is interpreted as a range from 2 inches to 1⁄2 inch.
  • {{convert|-2+1⁄2|in|mm|1}}[convert: invalid number] Red XN This is neither a mixed number nor a range, and mathematical expressions requiring calculations are not allowed here.
  • {{convert|2+½|in|mm|1}}[convert: invalid number] Red XN Fractions consisting of a single Unicode character are not allowed either.

Horizontal fraction bar: 1/2 inch[edit]

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

  • {{convert|1//2|in|mm|1}}1/2 inch (12.7 mm)
  • {{convert|6+3//8|in|mm|1}}6+3/8 inches (161.9 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 (1/2 in)
  • {{convert|161.9|mm|frac=-8}}161.9 millimetres (6+3/8 in)

Thousands separator: 1,000 mi or 1000 mi[edit]

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 (4,050,417 ft)
  • {{convert|1,234,567|m|ft}} → 1,234,567 metres (4,050,417 ft)

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

  • {{convert|1234567|m|ft|comma=off}} → 1234567 metres (4050417 ft)

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

  • {{convert|1234567|m|ft|comma=gaps}}1234567 metres (4050417 ft)

Default behavior, for comparison:

  • {{convert|1234567|m|ft}} → 1,234,567 metres (4,050,417 ft)

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

  • {{convert|1234|m|ft|comma=5}} → 1234 metres (4049 ft)
  • {{convert|1234567|m|ft|comma=5}} → 1,234,567 metres (4,050,417 ft)

Default behavior, for comparison:

  • {{convert|1234|m|ft}} → 1,234 metres (4,049 ft)

Output manipulation[edit]

Brackets and separators: 10 m [33 ft] [edit]

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

  • {{convert|10|m|ft|disp=sqbr}} → 10 metres [33 ft]
  • {{convert|10|m|ft|disp=comma}} → 10 metres, 33 ft
  • {{convert|10|m|ft|disp=semicolon}} → 10 metres; 33 ft
  • {{convert|10|m|ft|disp=or}} → 10 metres or 33 feet

Default behavior, for comparison:

  • {{convert|10|m|ft}} → 10 metres (33 ft)

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

  • {{convert|10|m|ft|disp=br}} → 10 metres
    33 feet

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

  • {{convert|10|m|ft|disp=br()}} → 10 metres
    (33 feet)

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

  • {{convert|10|m|ft|disp=x|_MyText_}} → 10 metres_MyText_33 ft (To display spaces, use &nbsp;)

Flipping (reordering) the two measurements: 1,609.3 metres (1 mile)[edit]

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

  • {{convert|1|mi|m|order=flip}} → 1,609.3 metres (1 mile)

Default behavior, for comparison:

  • {{convert|1|mi|m}} → 1 mile (1,609.3 metres)

When converting to multiple units, the effect is:

  • {{convert|10|km|mi nmi|order=flip}} → 6.2137 miles; 5.3996 nautical miles (10 kilometres)
  • {{convert|10|km|nmi mi|order=flip}} → 5.3996 nautical miles; 6.2137 miles (10 kilometres)

Fixed ordering of output units: 212 °F (100 °C; 373 K)[edit]

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

  • {{convert|100|C|F C K|abbr=on|order=out}} → 212 °F (100 °C; 373 K)
  • {{convert|200|PS|kW hp|0|abbr=on|order=out}} → 147 kW (197 hp)

See also: § Displaying parts of the output.

Displaying parts of the result: 2 (1.5)[edit]

It is possible to display only parts of the conversion result: The following examples show how to display only a part of the result.

Note: in Convert, abbr is synonym for unit symbol
Convert Returns Components
{{convert|2|cuyd|m3}} 2 cubic yards (1.5 m3) all (default conversion)
{{convert|2|cuyd|m3|abbr=on}} 2 cu yd (1.5 m3) all (default conversion, abbr)
{{convert|2|cuyd|m3|abbr=values}} 2 (1.5) numbers only
{{convert|2|cuyd|cuyd|disp=out}} 2.0 cu yd input value (workaround)
{{convert|2|cuyd|cuyd|disp=out|abbr=on}} 2.0 cu yd input value abbr (workaround)
{{convert|2|cuyd|m3|disp=unit}} cubic yards input unit
{{convert|2|cuyd|m3|disp=unit|adj=on}} cubic-yard input unit, adjectival (hyphenated)
{{convert|2|cuyd|m3|disp=unit|adj=on|abbr=on}} cu yd input unit, adjectival (abbr so not hyphenated)
{{convert|2|cuyd|m3|disp=unit|abbr=on}} cu yd input unit abbr
{{convert|2|cuyd|m3|disp=out}} 1.5 m3 output value, symbols
{{convert|2|cuyd|m3|disp=out|abbr=off}} 1.5 cubic metres output value, names
{{convert|2|cuyd|m3|disp=out|adj=on|abbr=off}} 1.5-cubic-metre output, adjective
{{convert|2|cuyd|m3|disp=number}} 1.5 output number
{{convert|2|cuyd|m3|disp=unit2}} m3 output unit (abbr by default)
{{convert|2|cuyd|m3|disp=unit2|abbr=off}} cubic metres output unit (name)
{{convert|2|cuyd|m3|disp=unit2|abbr=on}} m3 output unit (abbr)

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

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

  • {{convert|2|kPa|psi|abbr=~}} → 2 kilopascals [kPa] (0.29 psi)
  • A {{convert|2|kPa|psi|abbr=~|adj=on}} pressureA 2-kilopascal [kPa] (0.29 psi) pressure

Table options[edit]

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[edit]

|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 kilometres
62 miles
100 kilometres
(62 miles)

Table columns[edit]

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}}

style="text-align:right;"|10 |style="text-align:right;"|33

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

{{convert|20|m|ft|disp=tablecen}}

style="text-align:center;"|20 |style="text-align:center;"|66

The units are added as a column header:

  kilograms pounds stone and pounds
|disp=table 10 22 1 st 8 lb
|disp=table and |abbr=on 20 kg 44 lb 3 st 2 lb
|disp=table and |abbr=off 30 kilograms 66 pounds 4 stone 10 pounds
|disp=tablecen 40 88 6 st 4 lb
|disp=<other> (default) 50 kilograms (110 lb; 7 st 12 lb)

Sorting[edit]

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}} <span data-sort-value="7001100000000000000♠"></span>10 metres (33 ft)
showing: 10 metres (33 ft).

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

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[edit]

The conversion factors and physical constants are sourced here.

'per' units: kg/ha, miles per gallon[edit]

When using a slash (/), a unit like kg/ha is recognized as kilograms per hectare and will be converted in to other mass/area units. A unit in the numerator is not required.

  • {{convert|1000|kg/ha}} → 1,000 kilograms per hectare (890 lb/acre)
  • {{convert|350|/in2}} → 350 per square inch (54/cm2)

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

  • {{convert|10|PD/sqmi|PD/km2}} → 10 inhabitants per square mile (3.9/km2)

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 miles per US gallon (9.0 l/100 km; 31 mpg‑imp)

Units of difference: Expressing a change or difference in temperature[edit]

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

  • {{convert|10|C}} → 10 °C (50 °F) (standard temperature conversion)
  • {{convert|10|-|15|C}} → 10–15 °C (50–59 °F) (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:

  • {{convert|10|C-change}} → 10 °C (18 °F) increase in temperature
  • {{convert|10|-|15|C-change}} → 10–15 °C (18–27 °F) warmer than normal

To produce multiple units in the output:

  • {{convert|10|C-change|F-change K-change}} → 10 °C (18 °F; 10 K) difference

Multiple units: 1 ft 5 in[edit]

In input[edit]

Base document § Input multiples 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 2 feet 3 inches (1.60 m)
  • {{convert|2|ft|3|in|cm}} → 2 feet 3 inches (69 cm)
  • {{convert|1|lb|5|oz|g}} → 1 pound 5 ounces (600 g)

In output[edit]

Available multiple-unit output options predefined, like ftin and ydftin. The full list is at § Output multiples.

  • {{convert|2|m|ftin}} → 2 metres (6 ft 7 in)
  • {{convert|2|m|ft in}} → 2 metres (6.6 ft; 79 in), using a space, returns the decimal point

Default behavior, for comparison:

  • {{convert|2|m}} → 2 metres (6 ft 7 in)


Currency per unit: $/mi → $/km[edit]

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

  • {{convert|3.39|$/USgal|$/L}} → $3.39 per US gallon ($0.90/L)
  • {{convert|10000|€/ha|€/acre}} → €10,000 per hectare (€4,000/acre)
  • {{convert|10|¢/mi|¢/km}} → 10 cents per mile (6.2 ¢/km)
  • {{convert|1500|¥/lb|¥/kg}} → ¥1,500 per pound (¥3,300/kg)

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

  • {{convert|10|$/mi|$/km|$=€}} → €10 per mile (€6.2/km)

It is not possible to convert the currency:

So, this result (mixed currencies) is not possible: $15 per mile (€8.6/km) Red XN

Parameter list[edit]

Parameter Value Description Note
|abbr=in in Use symbol for first (left-hand side) unit Unit display
|abbr=off off Use name for all units Unit display
|abbr=none none
|abbr=on on Use symbol for all units (default for {{cvt}}) Unit display
|abbr=out out Use symbol for right-hand side unit (default) Unit display
|abbr=unit unit Use symbol for all units when using scientific notation Unit display
|abbr=values values Omit both the input and output units: show only the numbers Unit display
|abbr=~ ~ Shows both unit name and symbol Unit display
|adj=mid|… mid User-specified text after the input unit; sets adj=on (adjective). Expects 1 unnamed parameter. Word adding, adjective
|adj=on on Unit name is adjective (singular and hyphenated) Grammar, adjective
|adj=pre|… pre User-specified text before input unit. Expects 1 unnamed parameter. Word adding
|adj=ri0 ri0 Round input with precision 0 Input precision
|adj=ri1 ri1 Round input with precision 1 Input precision
|adj=ri2 ri2 Round input with precision 2 Input precision
|adj=ri3 ri3 Round input with precision 3 Input precision
|comma=5 5 Only use comma for thousands separator if 5 or more digits Number format
|comma=gaps gaps Use gaps (space), not comma, for thousands separator Number format
|comma=off off No thousands separator Number format
|disp=b b Join input and output using " (...)" (default) Join values
|disp=sqbr sqbr Join input and output using " [...]" Join values
|disp=br br Join input and output using "<br/>" Join values
|disp=comma comma Join input and output using ", " Join values
|disp=or or Join input and output using " or " Join values
|disp=number number Display output number only Parts only
|disp=output number only output number only
|disp=out out Display only output number and name/symbol Parts only
|disp=output only output only
|disp=preunit|…[|…] preunit Text to be inserted after value and before units, for both input and output, with optionally different text for output. Expects 1 or 2 unnamed parameters. Word adding
|disp=table table Output is suitable for a table cell with align="right" Table columns
|disp=tablecen tablecen Output is suitable for a table cell with align="center" Table columns
|disp=unit unit Display input name/symbol only (not input number, not output) Parts only
|disp=unit2 unit2 Display output name/symbol only (not input; not output number) Parts only
|disp=x|… x Join input and output using user-specified text Word adding
|frac=N N Show imperial number in fractions, denominator=N Number format, fraction
|input=P2048 P2048 (e.g.) Reads and converts Wikidata property Inside template
|lk=in in Link left-hand side unit name or symbol Unit link
|lk=on on Link all unit names or symbols (but not twice for the same unit) Unit link
|lk=out out Link right-hand side unit name or symbol Unit link
|order=flip flip Inverts order of input, output measurements (conversion first) Order
|order=out out Displays output units in the order entered, skipping input unit Order
|qid=Q1056131 Q1056131 (e.g.) Reads Wikidata property from Wikidata item Inside template; testing
|qual=Q613628 Q613628 (e.g.) Qualify Wikidata property
|round=5 5 Rounds calculation to the nearest multiple of 5 Output precision
|round=25 25 Rounds calculation to the nearest multiple of 25 Output precision
|round=each each In a range, each number is rounded by the default rounding Output precision
|sigfig=N N Round output number to N significant figures (N is a positive integer) Output precision
|sortable=on on Adds invisible sort key Table sort
|sp=us us Use U.S. spelling ("meter" instead of default "metre") Spelling U.S. names
|spell=in in Spell input number in words Spelling numbers
|spell=In In Spell input number in words with first letter uppercase Spelling numbers
|spell=on on Spell input and output numbers in words Spelling numbers
|spell=On On Spell input and output numbers in words with first letter uppercase Spelling numbers
|$=€ Replace $-sign with a currency sign, for example in €/hectare Cost per unit
No currency conversion happens
|debug=yes yes Debugging only. In a sortable table: show the normally hidden sort key Table sort
|disp=flip flip Deprecated. Use |order=flip Order
|sing= Deprecated. Use |adj= Plurals

TemplateData[edit]

This is the TemplateData documentation for this template used by VisualEditor and other tools.

TemplateData for Convert

Converts measurements to other units.

Template parameters

This template prefers inline formatting of parameters.

ParameterDescriptionTypeStatus
Value1

The value to convert.

Numberrequired
From unit2

The unit for the provided value.

Suggested values
km2 m2 cm2 mm2 ha sqmi acre sqyd sqft sqin km m cm mm mi yd ft in kg g mg lb oz m/s km/h mph K C F m3 cm3 mm3 L mL cuft cuin U.S.gal U.S.oz psi mpgU.S. $/lb $/kg
Example
km
Stringrequired
To units3

The units to convert into. Separate units by a space for multiple outputs. In an output unit, use + for a multiplication space.

Suggested values
km2 m2 cm2 mm2 ha sqmi acre sqyd sqft sqin km m cm mm mi yd ft in kg g mg lb oz m/s km/h mph K C F m3 cm3 mm3 L mL cuft cuin U.S.gal U.S.oz psi mpgU.S. $/lb $/kg
Example
mi nmi
Stringsuggested
Precision or suffix4

Significant digits after decimal dot or, if negative, exponent of ten.

Numberoptional
Link unitslk

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. For more fine-grained control over which units to link, use the template multiple times.

Suggested values
in out on off
Default
off
Example
on
Stringoptional
Abbreviationabbr

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).

Suggested values
in off none on out unit values ~
Default
out
Example
on, unit, in, out, off
Stringsuggested
Spellingsp

Spelling of units. Use “us” to display unit names using U.S. spelling.

Example
us
Stringoptional
Adjectiveadj

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.

Suggested values
mid on pre ri0 ri1 ri2 ri3 off
Default
off
Example
on
Unbalanced wikitextoptional
Conversiondisp

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.

Suggested values
b sqbr br comma semicolon or number output number only out output only preunit table tablecen unit unit2 x
Example
b
Stringoptional
Orderingorder

“flip” returns converted value first, input value second.

Suggested values
flip out
Example
flip
Stringoptional
Significant figuressigfig

Indicates the number of significant figures to be used in rounding.

Numberoptional
Rounding outputround

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.

Numberoptional
Thousands separatorcomma

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
Example
off
Booleanoptional
Sort keysortable

“on” generates a hidden sort key

Example
on
Booleanoptional
Spell numbers?spell

If used, spells input or input and output numbers in words, optionally capitalizing the first

Suggested values
in In on On
Example
'in', 'In', 'on', or 'On'
Stringoptional
Singular?sing

If 'yes', uses singular form of units (deprecated)

Example
yes
Booleandeprecated
Fraction?frac

fraction as rounding unit

Numberoptional
Currency symbol$

sets currency symbol in both units

Example
$=€ will show " €10 per mile (€6.2/km)"
Stringoptional
Mach altitude (ft)altitude_ft

Mach (speed) depends on altitide

Suggested values
10000
Numberoptional
Mach altitude (m)altitude_m

Mach (speed) depends on altitude

Numberoptional
WD propertyinput

Reads the property value of the item (article), then converts it

Example
{{convert|input=P2046}} (P2046=area)
Stringoptional