Square kilometer to Square millimeter
Square kilometer (km²)
Square millimeter (mm²)
How it is calculated
Each unit is defined via the base unit (square meter (m²)). The value is first converted to the base unit, then to the selected unit.
1 km² = 1000000 m²
1 mm² = 1.00000000e-6 m²
1 km² × 1000000 = 1000000 m²
1000000 m² ÷ 1.00000000e-6 = 1.00000000e12 mm²