Convert square millimeter to square kilometer
1 mm² = 1.000000000e-12 km²
1 mm² = 1.00e-12 km²
1 mm² in every area unit
| square millimeter | 1 mm² |
| square centimeter | 0.01 cm² |
| square meter | 0.000001 m² |
| hectare | 1.00e-10 ha |
| square kilometer | 1.00e-12 km² |
| square inch | 0.00155 in² |
| square foot | 0.0000108 ft² |
| square yard | 0.0000012 yd² |
| acre | 2.47e-10 ac |
| square mile | 3.86e-13 mi² |
How the conversion works
Multiply by 1.000000000e-12 to go from square millimeter to square kilometer, or divide by it to go back. Every conversion on this site routes through the SI value (m²) rather than a table of pairwise factors, so a round-trip returns exactly what you started with.
Going the other way? square kilometer to square millimeter — 1 km² = 1,000,000,000,000 mm².
square millimeter to square kilometer — common values
| 1 mm² | 1.0000000e-12 km² |
| 2 mm² | 2.0000000e-12 km² |
| 3 mm² | 3.0000000e-12 km² |
| 5 mm² | 5.0000000e-12 km² |
| 10 mm² | 1.0000000e-11 km² |
| 15 mm² | 1.5000000e-11 km² |
| 20 mm² | 2.0000000e-11 km² |
| 25 mm² | 2.5000000e-11 km² |
| 50 mm² | 5.0000000e-11 km² |
| 75 mm² | 7.5000000e-11 km² |
| 100 mm² | 1.0000000e-10 km² |
| 250 mm² | 2.5000000e-10 km² |
| 500 mm² | 5.0000000e-10 km² |
| 1000 mm² | 1.0000000e-09 km² |
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