Square metre

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.[1]

Adding and subtracting SI prefixes creates multiples and submultiples; however, as the unit is exponentiated, the quantities grow geometrically by the corresponding power of 10. For example, a kilometre is 103 (a thousand) times the length of a metre, but a square kilometre is 1032 (106, a million) times the area of a square metre, and a cubic kilometre is 1033 (109, a billion) cubic metres.

SI prefixes applied

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

MultiplicationNameSymbol MultiplicationNameSymbol
100 square metre (centiare) m2 100 square metre (centiare) m2
102square decametre (are)dam2 10−2square decimetredm2
104square hectometre (hectare)hm2 10−4square centimetrecm2
106square kilometrekm2 10−6square millimetremm2
1012square megametreMm2 10−12square micrometreµm2
1018square gigametreGm2 10−18square nanometrenm2
1024square terametreTm2 10−24square picometrepm2
1030square petametrePm2 10−30square femtometrefm2
1036square exametreEm2 10−36square attometream2
1042square zettametreZm2 10−42square zeptometrezm2
1048square yottametreYm2 10−48square yoctometreym2

Unicode characters

Square metre: Unicode characters.[2]
Symbol Name Unicode number
Square metre (Square M Squared) U+33A1
Square kilometre (Square KM Squared) U+33A2
Square decimetre (Square DM Squared) U+3378
Square centimetre (Square CM Squared) U+33A0
Square millimetre (Square MM Squared) U+339F


A square metre is equal to:

See also


  1. David R. Lide, ed. (2010), "INTERNATIONAL SYSTEM OF UNITS", CRC Handbook of Chemistry and Physics (90th ed.)
  2. Unicode Consortium (2019). "The Unicode Standard 12.0 – CJK Compatibility ❰ Range: 3300—33FF ❱" (PDF). Unicode.org. Retrieved May 24, 2019.
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