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From Wikipedia, the free encyclopedia

A square metre quadrat made of PVC pipe.

The square metre (also spelled square meter, see spelling differences) is the SI derived unit of area, with symbol m2 (33A1 in Unicode[1]). It is defined as 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 in turn is defined as the length of the path travelled by light in absolute vacuum during a time interval of 1299,792,458 of a second.

Adding and multiplying 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 one thousand times the length of a metre, but a square kilometre is one million times the area of a square metre.

Square metres are not necessarily the same as meters squared[2]: an area 2 metres wide by 5 metres long would be 10 square metres, while 10 metres squared means an area of 10 metres by 10 metres. So 10 metres squared equals 100 square meters.


SI prefixes applied to the square metre

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

Multiplication Name Symbol plusing 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


A square metre is equal to:

See also


External links


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