square metre

SI coherent derived unit

Name	Symbol	Derived quantity
square metre	m2	area
Definition The square metre, symbol m2, is the SI coherent derived unit of area.   One square metre is equal to the area of a square with sides one metre in length.

Area

Area is the quantity that expresses the size of a two-dimensional space.

Orders of magnitude

100 mm2	=	1 cm2	=	0.0001 m2	=	10-4 m2
100 cm2	=	1 dm2	=	0.01 m2	=	10-2 m2
100 dm2	=	1 m2	=	1 m2	=	100 m2
100 m2	=	1 dam2	=	100 m2	=	102 m2
100 dam2	=	1 hm2	=	10 000 m2	=	104 m2
100 hm2	=	1 km2	=	1 000 000 m2	=	106 m2

Non-SI units of area

The hectare, symbol ha, is a non-coherent non-SI unit of area, accepted for use with the SI. It is equal to one square hectometre, symbol hm².

Note: SI prefixes must not be used with the hectare.

Usage

Abreviations, such as sq.m. and SQ.M., must not be used in place of the SI symbol m².