Length Units and Conversion - Unit Calculator

The calculator converts between length units.

%cm 1.6m

The calculator will show 160.0 cm. %cm means the unit of result value is cm.

\[ 1.6 \mathrm{m} = 160.0 \mathrm{cm} \]

Note that 1.6m can't be input like 1.6 m. There is no space between number and unit.

The calculator regard % as the command of unit conversion. There is no space % and unit so % cm makes no sense. %cm is correct.

Another example:

Length Unit

Multiple arguments

Multiple values can be input and the calculator automatically sum them and convert. So if you input

%m 3km 740yd

the sum of 3km and 740yard is converted to m unit. The result is 3676.656 m.


3676.656 m

Metric prefix

10cm has cm unit and c is the metric prefix of m. m is a standard unit of length and prefix c (centi) means the scale means 10-2. In fact, 1cm = 10-2m.

There are many prefixes scaling from y (10-24) to Y (1024).

Name Symbol Scale
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
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


mi (mile) is a length unit and 1mi = 1.609344 × 103m = 1609.344m.


yd is the symbol of yard and 1yd = 0.9144m.


ft is the symbol of foot and 1ft = (0.9144/3)m = 0.3048m. 1ft is smaller than 1yd.


in (inch) is defined as (0.9144/36)m. 1in = 0.0254m. Inch is often used to measure a width or height of screen.