Convert acre to square kilometer
1 ac = 0.004046856422 km²
1 ac = 0.0040469 km²
1 ac in every area unit
| microbarn | 4.0469e+37 μb |
| millibarn | 4.0469e+34 mb |
| barn | 4.0469e+31 b |
| square nanometer | 4.0469e+21 nm² |
| square micrometer | 4.0469e+15 μm² |
| circular mil | 7,986,600,000,000 cmil |
| thousand circular mils | 7,986,600,000 kcmil |
| square millimeter | 4,046,900,000 mm² |
| square centimeter | 40,469,000 cm² |
| square inch | 6,272,600 in² |
| square decimeter | 404,690 dm² |
| square foot | 43,560 ft² |
| square yard | 4,840 yd² |
| square meter | 4,046.9 m² |
| tsubo | 1,224.2 tsubo |
| square rod | 160 rd² |
| are | 40.469 a |
| square chain | 10 ch² |
| dunam | 4.0469 dunam |
| rood | 4 rood |
| acre | 1 ac |
| hectare | 0.40469 ha |
| square kilometer | 0.0040469 km² |
| square mile | 0.0015625 mi² |
How the conversion works
Multiply by 0.004046856422 to go from acre 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 acre — 1 km² = 247.1053815 ac.
acre to square kilometer — common values
| 1 ac | 0.0040468564 km² |
| 2 ac | 0.0080937128 km² |
| 3 ac | 0.012140569 km² |
| 5 ac | 0.020234282 km² |
| 10 ac | 0.040468564 km² |
| 15 ac | 0.060702846 km² |
| 20 ac | 0.080937128 km² |
| 25 ac | 0.10117141 km² |
| 50 ac | 0.20234282 km² |
| 75 ac | 0.30351423 km² |
| 100 ac | 0.40468564 km² |
| 250 ac | 1.0117141 km² |
| 500 ac | 2.0234282 km² |
| 1000 ac | 4.0468564 km² |