Convert 1 square millimeter to square kilometer

1 mm² (square millimeter) is equal to 0.000000000001 km² (square kilometer). To convert from square millimeter to square kilometer, multiply by 0.000000000001 or divide by 1,000,000,000,000.

• 1 mm² × 1.0E-12 = 1.0E-12 km²
• 1 mm² ÷ 1000000000000 = 1.0E-12 km²