Editing Area (section)

===Conversions===
[[File:Area conversion - square mm in a square cm.png|thumb|right|alt=A diagram showing the conversion factor between different areas|Although there are 10 mm in 1 cm, there are 100 mm<sup>2</sup> in 1 cm<sup>2</sup>.]]
Calculation of the area of a square whose length and width are 1 metre would be:

1 metre × 1 metre = 1&nbsp;m<sup>2</sup>

and so, a rectangle with different sides (say length of 3 metres and width of 2 metres) would have an area in square units that can be calculated as:

3 metres × 2 metres = 6&nbsp;m<sup>2</sup>. This is equivalent to 6 million square millimetres. Other useful conversions are:
* 1 square kilometre = [[million|1,000,000]] square metres
* 1 square metre = [[10000 (number)|10,000]] square centimetres = 1,000,000 square millimetres
* 1 square centimetre = [[100 (number)|100]] square millimetres.

==== Non-metric units ====
In non-metric units, the conversion between two square units is the [[square (algebra)|square]] of the conversion between the corresponding length units.
:1 [[foot (unit)|foot]] = 12 [[inch]]es,
the relationship between square feet and square inches is
:1 square foot = 144 square inches,
where 144 = 12<sup>2</sup> = 12 × 12.  Similarly:
* 1 square yard = [[9 (number)|9]] square feet
* 1 square mile = 3,097,600 square yards = 27,878,400 square feet
In addition, conversion factors include:
* 1 square inch = 6.4516 square centimetres
* 1 square foot = {{gaps|0.092|903|04}} square metres
* 1 square yard = {{gaps|0.836|127|36}} square metres
* 1 square mile = {{gaps|2.589|988|110|336}} square kilometres