**Square kilometre**(symbol

**kmē**) is an SI unit of surface area. It is one of the SI derived units.

1 kmē is equal to:

- the area of a square measuring 1 kilometre on each side
- 1 000 000 mē
- 100 hectares
- 0.386 102 square miles (statute)
- 247.105 381 acres

- 1 mē = 0.000 001 kmē
- 1 hectare = 0.01 kmē
- 1 square mile = 2.589 988 kmē
- 1 acre = 0.004 047 kmē