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.
When to convert acre to square kilometer
1Real estate and property (sq ft, acres)
2Agriculture (hectares, acres)
3Construction and flooring (m², sq ft)
4Surveying and mapping (km², mi²)
Area conversion — common questions
How many square feet in 1 acre?
1 acre = 43,560 ft² ≈ 4,046.86 m² ≈ 0.4047 hectares.
Is 1 hectare bigger than 1 acre?
Yes. 1 hectare = 10,000 m² ≈ 2.4711 acres.
How do I convert square meters to square feet?
Multiply by 10.7639. So 100 m² = 1,076.39 ft².
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