acres to square kilometers
Convert acre to square kilometer — instant, free, with the formula shown.
1 ac=0.004047 km²
How to convert acre to square kilometer
To convert acre to square kilometer, multiply by 0.00404686:
km² = ac × 0.00404686
For example, 10 ac × 0.004047 = 0.040469 km².
ac to km² conversion table
| acres (ac) | square kilometers (km²) |
|---|---|
| 1 ac | 0.004047 km² |
| 2 ac | 0.008094 km² |
| 5 ac | 0.020234 km² |
| 10 ac | 0.040469 km² |
| 25 ac | 0.101171 km² |
| 50 ac | 0.202343 km² |
| 100 ac | 0.404686 km² |
| 250 ac | 1.011714 km² |
| 500 ac | 2.023428 km² |
| 1000 ac | 4.046856 km² |
Other acre conversions
Convert to square kilometer from another unit
ac to km² — frequently asked
How many square kilometers are in 1 acre?
1 acre = 0.004047 square kilometers (ac × 0.004047 = km²).
What is the formula to convert acre to square kilometer?
Multiply your acre value by 0.00404686 to get square kilometer.
How do I convert 10 acres to square kilometers?
10 ac = 0.040469 km². For 100 ac the answer is 0.404686 km². Use the calculator on this page for any other value.