Convert acres to square kilometers
1 ac = 0.0040468564224 km² — exactly. Both units are defined against the SI, so this factor is a fraction, not an approximation.
0.004 046 856 422 4km²
Exact decimal: 0.0040468564224
As a fraction: 158080329/39062500000
1 ac = 0.0040468564224 km²
How to convert acres to square kilometers
Multiply the number of acres by 0.0040468564224 to get square kilometers.
The exact factor is 0.0040468564224 — as a fraction, 158080329/39062500000.
Acre: Exactly 4840 square yards — historically a day of ploughing.
Acre to Square kilometer conversion table
| Acres (ac) | Square kilometers (km²) |
|---|---|
| 1 ac | 0.004 046 856 4 |
| 2 ac | 0.008 093 712 8 |
| 3 ac | 0.012 140 569 |
| 5 ac | 0.020 234 282 |
| 10 ac | 0.040 468 564 |
| 20 ac | 0.080 937 128 |
| 25 ac | 0.101 171 41 |
| 50 ac | 0.202 342 82 |
| 100 ac | 0.404 685 64 |
| 250 ac | 1.011 714 1 |
| 500 ac | 2.023 428 2 |
| 1000 ac | 4.046 856 4 |
Square kilometer to Acre conversion table
| Square kilometers (km²) | Acres (ac) |
|---|---|
| 1 km² | 247.105 38 |
| 2 km² | 494.210 76 |
| 3 km² | 741.316 14 |
| 5 km² | 1235.5269 |
| 10 km² | 2471.0538 |
| 20 km² | 4942.1076 |
| 25 km² | 6177.6345 |
| 50 km² | 12 355.269 |
| 100 km² | 24 710.538 |
| 250 km² | 61 776.345 |
| 500 km² | 123 552.69 |
| 1000 km² | 247 105.38 |
Frequently asked
How many square kilometers are in a acre?
One acre equals 0.004046856422 square kilometers (ac → km²). That figure is exact, not rounded.
How do you convert acres to square kilometers?
Multiply the number of acres by 0.0040468564224 to get square kilometers.
What is 1 km² in acres?
One square kilometer is 247.1053815 acres.
What is 10 ac in km²?
10 ac = 0.040 468 564 km².
What exactly is a acre?
Exactly 4840 square yards — historically a day of ploughing.