square metre
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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 (french: Bureau international des poids et mesures, BIPM) is an List of intergovernmental organizations, intergovernmental organisation, through which its 59 member-states act together on measur ...
) or square meter ( American spelling) is the unit of
area Area is the quantity that expresses the extent of a region on the plane or on a curved 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 o ...

area
in the
International System of Units The International System of Units, known by the international abbreviation SI in all languages and sometimes Pleonasm#Acronyms and initialisms, pleonastically as the SI system, is the modern form of the metric system and the world's most wid ...
(SI) with symbol m2. It is the area of a
square In Euclidean geometry, a square is a regular polygon, regular quadrilateral, which means that it has four equal sides and four equal angles (90-degree (angle), degree angles, π/2 radian angles, or right angles). It can also be defined as a rec ...

square
with sides one
metre The metre (British English, British spelling) or meter (American English, American spelling; American and British English spelling differences#-re, -er, see spelling differences) (from the French unit , from the Greek language, Greek noun , "m ...
in length. Adding and subtracting
SI prefix The International System of Units, known by the international abbreviation SI in all languages and sometimes Pleonasm#Acronyms and initialisms, pleonastically as the SI system, is the modern form of the metric system and the world's most wid ...
es creates multiples and submultiples; however, as the unit is exponentiated, the quantities
grow exponentially
grow exponentially
by the corresponding power of 10. For example, 1
kilometre The kilometre (SI symbol: km; or ), spelt kilometer in American 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 now the measurement unit used for exp ...
is 103 (one
thousand 1000 or one thousand is the natural number following 999 (number), 999 and preceding 1001 (number), 1001. In most English-speaking countries, it can be written with or without a comma or sometimes a period decimal mark#Digit grouping, separating ...
) times the length of 1 metre, but 1 square kilometre is (103)2 (106, one
million One million (1,000,000), or one thousand thousand, is the natural number In mathematics, the natural numbers are those numbers used for counting (as in "there are ''six'' coins on the table") and ordering (as in "this is the ''third'' larg ...

million
) times the area of 1 square metre, and 1 cubic kilometre is (103)3 (109, one
billion Billion is a word for a large number, and it has two distinct definitions: * 1,000,000,000, i.e. one thousand million, or (ten to the ninth power), as defined on the short scale. This is its only current meaning in English. * 1,000,000,000,000, ...

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 Square kilometre (American and British English spelling differences#-re, -er, International spelling as used by the International Bureau of Weights and Measures) or square kilometer (American spelling), symbol km2, is a multiple of the square metre ...
(km2) * square centimetres (cm2) *
hectare The hectare (; SI symbol: ha) is a Non-SI units mentioned in the SI, non-SI metric unit of area equal to a square with 100-metre sides (1 hm2), or 10,000 m2, and is primarily used in the measurement of land. There are 100 hectares in one ...

hectare
s (ha) * decares (daa) *
are
are
s (a) * deciares (da) * centiare (ca) *
acre The acre is a Unit of measurement, unit of land area used in the Imperial units, imperial and United States customary units#Units of area, US customary systems. It is traditionally defined as the area of one Chain (unit), chain by one furlong ( ...

acre
s *
cent
cent
s *
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 Un ...
s * square feet *
square inch A square inch (plural: square inches) is a unit of area Area is the quantity that expresses the extent of a region on the plane or on a curved surface. The area of a plane region or ''plane area'' refers to the area of a shape or planar ...
es


Examples

* One square meter can stand up to 5 people at the same time.


See also

*
Conversion of units § Area
Conversion of units § Area
* Orders of magnitude (area) *
SI
SI
*
SI prefix The International System of Units, known by the international abbreviation SI in all languages and sometimes Pleonasm#Acronyms and initialisms, pleonastically as the SI system, is the modern form of the metric system and the world's most wid ...


Notes

{{Reflist


External links


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