Square metre
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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 m^{2} (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.
Contents
SI prefixes applied to the square metre
The square metre may be used with all SI prefixes used with the meter.
Multiplication  Name  Symbol  Multiplication  Name  Symbol  

10^{0}  square metre (centiare)  m^{2}  10^{0}  square metre (centiare)  m^{2}  
10^{2}  square decametre (are)  dam^{2}  10^{−2}  square decimetre  dm^{2}  
10^{4}  square hectometre (hectare)  hm^{2}  10^{−4}  square centimetre  cm^{2}  
10^{6}  square kilometre  km^{2}  10^{−6}  square millimetre  mm^{2}  
10^{12}  square megametre  Mm^{2}  10^{−12}  square micrometre  µm^{2}  
10^{18}  square gigametre  Gm^{2}  10^{−18}  square nanometre  nm^{2}  
10^{24}  square terametre  Tm^{2}  10^{−24}  square picometre  pm^{2}  
10^{30}  square petametre  Pm^{2}  10^{−30}  square femtometre  fm^{2}  
10^{36}  square exametre  Em^{2}  10^{−36}  square attometre  am^{2}  
10^{42}  square zettametre  Zm^{2}  10^{−42}  square zeptometre  zm^{2}  
10^{48}  square yottametre  Ym^{2}  10^{−48}  square yoctometre  ym^{2} 
Conversions
A square metre is equal to:
 0.000 001 square kilometre (km^{2})
 10,000 square centimetres (cm^{2})
 0.000 1 hectares (ha)
 0.001 decares (daa)
 0.01 ares (a)
 0.1 deciares (da)
 1 centiare (ca)
 0.000 247 105 381 acres
 0.024 710 538 cents
 1.195 990 square yards
 10.763 911 square feet
 1,550.003 1 square inches
See also
Notes
 ↑ "Unicode Utilities: Character Properties".<templatestyles src="Module:Citation/CS1/styles.css"></templatestyles>
External links
 BIPM (SI maintenance agency) (home page)
 BIPM brochure (SI reference)