Convert square kilometer to square millimeter
1 km² = 1,000,000,000,000 mm²
1 km² = 1,000,000,000,000 mm²
1 km² in every area unit
| microbarn | 1.0000e+40 μb |
| millibarn | 1.0000e+37 mb |
| barn | 1.0000e+34 b |
| square nanometer | 1.0000e+24 nm² |
| square micrometer | 1.0000e+18 μm² |
| circular mil | 1.9735e+15 cmil |
| thousand circular mils | 1,973,500,000,000 kcmil |
| square millimeter | 1,000,000,000,000 mm² |
| square centimeter | 10,000,000,000 cm² |
| square inch | 1,550,000,000 in² |
| square decimeter | 100,000,000 dm² |
| square foot | 10,764,000 ft² |
| square yard | 1,196,000 yd² |
| square meter | 1,000,000 m² |
| tsubo | 302,500 tsubo |
| square rod | 39,537 rd² |
| are | 10,000 a |
| square chain | 2,471.1 ch² |
| dunam | 1,000 dunam |
| rood | 988.42 rood |
| acre | 247.11 ac |
| hectare | 100 ha |
| square kilometer | 1 km² |
| square mile | 0.3861 mi² |
How the conversion works
Multiply by 1,000,000,000,000 to go from square kilometer to square millimeter, 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 millimeter to square kilometer — 1 mm² = 1.000000000e-12 km².
square kilometer to square millimeter — common values
| 1 km² | 1,000,000,000,000 mm² |
| 2 km² | 2,000,000,000,000 mm² |
| 3 km² | 3,000,000,000,000 mm² |
| 5 km² | 5,000,000,000,000 mm² |
| 10 km² | 10,000,000,000,000 mm² |
| 15 km² | 15,000,000,000,000 mm² |
| 20 km² | 20,000,000,000,000 mm² |
| 25 km² | 25,000,000,000,000 mm² |
| 50 km² | 50,000,000,000,000 mm² |
| 75 km² | 75,000,000,000,000 mm² |
| 100 km² | 100,000,000,000,000 mm² |
| 250 km² | 250,000,000,000,000 mm² |
| 500 km² | 500,000,000,000,000 mm² |
| 1000 km² | 1.0000000e+15 mm² |