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The square metre ( international spelling as used by the
International Bureau of Weights and Measures The International Bureau of Weights and Measures (, BIPM) is an List of intergovernmental organizations, intergovernmental organisation, through which its 64 member-states act on measurement standards in areas including chemistry, ionising radi ...
) or square meter ( American spelling) is the unit of
area Area is the measure of a region's size on a surface. The area of a plane region or ''plane area'' refers to the area of a shape or planar lamina, while '' surface area'' refers to the area of an open surface or the boundary of a three-di ...
in the
International System of Units The International System of Units, internationally known by the abbreviation SI (from French ), is the modern form of the metric system and the world's most widely used system of measurement. It is the only system of measurement with official s ...
(SI) with symbol m2. It is the area of a
square In geometry, a square is a regular polygon, regular quadrilateral. It has four straight sides of equal length and four equal angles. Squares are special cases of rectangles, which have four equal angles, and of rhombuses, which have four equal si ...
with sides one
metre The metre (or meter in US spelling; symbol: m) is the base unit of length in the International System of Units (SI). Since 2019, the metre has been defined as the length of the path travelled by light in vacuum during a time interval of of ...
in length. 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 The kilometre (SI symbol: km; or ), spelt kilometer in American English, American and Philippine English, is a unit of length in the International System of Units (SI), equal to one thousand metres (kilo- being the SI prefix for ). It is the ...
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.


Unicode characters

Unicode has several characters used to represent metric area units, but these are for compatibility with East Asian character encodings and are meant to be used in new documents. * * * * * Instead, the Unicode superscript can be used, as in m².


Conversions

One square metre is equal to: * square kilometre (km2) * square centimetres (cm2) *
hectare The hectare (; SI symbol: ha) is a non-SI metric unit of area equal to a square with 100-metre sides (1 hm2), that is, square metres (), and is primarily used in the measurement of land. There are 100 hectares in one square kilometre. ...
s (ha) * decares (daa) * ares (a) * deciares (da) * centiare (ca) *
acre The acre ( ) is a Unit of measurement, unit of land area used in the Imperial units, British imperial and the United States customary units#Area, United States customary systems. It is traditionally defined as the area of one Chain (unit), ch ...
s * cents *
square yard The square yard (Indian English, Northern India: guz, gaj, Pakistani English, Pakistan: gaz) is an imperial unit and U.S. customary unit of area. It is in widespread use in most of the English language, English-speaking world, particularly the U ...
s * square feet * square inches


See also

* Conversion of units § Area * Orders of magnitude (area) * SI * SI prefix


Notes

{{Reflist


External links


BIPM (SI maintenance agency)
(home page)
BIPM brochure
(SI reference) Units of area SI derived units