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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.^[1]

Adding and subtracting SI prefixes creates multiples and submultiples; however, as the unit is exponentiated, the quantities grow exponentially by the corresponding power of 10. For example, 1 kilometre is 10³ (one thousand) times the length of 1 metre, but 1 square kilometre is (10³)² (10⁶, one million) times the area of 1 square metre, and 1 cubic kilometre is (10³)³ (10⁹, one billion) cubic metres.

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

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

Conversions

One square metre is equal to:

0.000001 square kilometre (km²)
10000 square centimetres (cm²)
0.0001 hectares (ha)
0.001 decares (daa)
0.01 ares (a)
0.1 deciares (da)
1 centiare (ca)
0.000247105381 acres
0.024710538 cents
1.195990 square yards
10.763911 square feet
1550.0031 square inches

Notes

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

External links

BIPM (SI maintenance agency) (home page)
BIPM brochure (SI reference)

[1] David R. Lide, ed. (2010), "INTERNATIONAL SYSTEM OF UNITS", CRC Handbook of Chemistry and Physics (90th ed.)

[Unicode-U3300-2] Unicode Consortium (2019). "The Unicode Standard 12.0 – CJK Compatibility ❰ Range: 3300—33FF ❱" (PDF). Unicode.org. Retrieved May 24, 2019.

[1]

[2]

@@ Line 1: / Line 1: @@
+{{short description|SI-derived unit of area}}
-Archie church had created cm².He discovered what the area is in something a bit like acres
+{{Redirect|m^2||m² (disambiguation)}}
+{{Comparison_area_units.svg}}
+The '''square metre''' ([[American and British English spelling differences#-re, -er|international spelling]] as used by the [[International Bureau of Weights and Measures]]) or '''square meter''' ([[American and British English spelling differences#-re, -er|American spelling]]) is the [[SI derived unit]] of [[area]] with symbol '''m<sup>2</sup>'''.<ref>{{citation | editor=David R. Lide | chapter=INTERNATIONAL SYSTEM OF UNITS | title=[[CRC Handbook of Chemistry and Physics]] | edition=90th | year=2010}}</ref>
+Adding and subtracting [[SI prefix]]es creates multiples and submultiples; however, as the unit is [[exponentiate]]d, the [[quantities]] [[exponential growth|grow exponentially]] by the corresponding [[power of 10]]. For example, 1 [[kilometre]] is 10<sup>3</sup> (one [[thousand]]) times the length of 1 metre, but 1 square kilometre is (10<sup>3</sup>)<sup>2</sup> (10<sup>6</sup>, one [[million]]) times the area of 1 square metre, and 1 cubic kilometre is (10<sup>3</sup>)<sup>3</sup> (10<sup>9</sup>, one [[billion]]) cubic metres.
 ==SI prefixes applied==