The base unit to measure surface area is the square metre.

The units to measure surface are units of area, meaning units of measurement for a two-dimensional geometric object.

### Properties

- One square metre is equal to 100 square decimetres and we write: 1 m\(^{2}\) = 100 dm\(^{2}\)
- One square metre is equal to 10 000 square centimetres and we write: 1 m\(^{2}\) = 10 000 cm\(^{2}\)
- One square metre is equal to 1 000 000 square millimetres and we write: 1 m\(^{2}\) = 1 000 000 mm\(^{2}\)
- One square kilometre is equal to 1 000 000 square metres and we write: 1 km\(^{2}\) = 1 000 000 m\(^{2}\)