Square metre

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Comparison of 1 Square metre with some Imperial and metric units of area (detailed view)

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

SI prefixes applied to the square metre[edit]

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

100square metre (centiare)m2100square metre (centiare)m2
102square decametre (are)dam210–2square decimetredm2
104square hectometre (hectare)hm210–4square centimetrecm2
106square kilometrekm210–6square millimetremm2
1012square megametreMm210–12square micrometreµm2
1018square gigametreGm210–18square nanometrenm2
1024square terametreTm210–24square picometrepm2
1030square petametrePm210–30square femtometrefm2
1036square exametreEm210–36square attometream2
1042square zettametreZm210–42square zeptometrezm2
1048square yottametreYm210–48square yoctometreym2


A square metre is equal to:

See also[edit]


External links[edit]