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The square metre (International spelling as used by the International Bureau of Weights and Measures) or square meter (American spelling) is the SI derived unit of area, with symbol m2 (33A1 in Unicode[1]). It is the area of a square whose sides measure exactly one metre. The square metre is derived from the SI base unit of the metre, which itself is defined as the length of the path travelled by light in absolute vacuum during a time interval of 1/299 792 458 of a second.

Adding and subtracting SI prefixes creates multiples and submultiples; however, as the unit is squared, the order of magnitude difference between units doubles from their comparable linear units. For example, a kilometre is 1000 times the length of a metre, but a square kilometre is 1 000 000 times the area of a square metre.

## SI prefixes applied

The square metre may be used with all SI prefixes used with the metre.

Multiplication Name Symbol Multiplication Name Symbol 100 square metre (centiare) m2 100 square metre (centiare) m2 102 square decametre (are) dam2 10−2 square decimetre dm2 104 square hectometre (hectare) hm2 10−4 square centimetre cm2 106 square kilometre km2 10−6 square millimetre mm2 1012 square megametre Mm2 10−12 square micrometre µm2 1018 square gigametre Gm2 10−18 square nanometre nm2 1024 square terametre Tm2 10−24 square picometre pm2 1030 square petametre Pm2 10−30 square femtometre fm2 1036 square exametre Em2 10−36 square attometre am2 1042 square zettametre Zm2 10−42 square zeptometre zm2 1048 square yottametre Ym2 10−48 square yoctometre ym2

## Conversions

A square metre is equal to: