Acres to square kilometres converter
Square kilometres (km²)
1 acre = 0.004046856422 square kilometres
How to convert acres to square kilometres
km² = ac × 0.0040468564224
Multiply the number of acres by 0.0040468564224 to get square kilometres. Going the other way, divide by 0.0040468564224 (or multiply by 247.105381467).
One acre is exactly defined as 0.0040468564224 square kilometres (to 12 significant figures), and one square kilometre is 247.105381467 acres.
Worked examples
- Convert 5 acres: 5 × 0.0040468564224 = 0.02023428211 0.02023428211 square kilometres.
- Convert 12.5 acres: 12.5 × 0.0040468564224 = 0.05058570528 0.05058570528 square kilometres.
- Convert 250 acres: 250 × 0.0040468564224 = 1.011714106 1.011714106 square kilometres.
Quick-reference table
| ac | km² |
|---|---|
| 1 | 0.004046856422 |
| 2 | 0.008093712845 |
| 3 | 0.01214056927 |
| 5 | 0.02023428211 |
| 10 | 0.04046856422 |
| 15 | 0.06070284634 |
| 20 | 0.08093712845 |
| 25 | 0.1011714106 |
| 50 | 0.2023428211 |
| 75 | 0.3035142317 |
| 100 | 0.4046856422 |
| 1,000 | 4.046856422 |
| km² | ac |
|---|---|
| 1 | 247.1053815 |
| 2 | 494.2107629 |
| 3 | 741.3161444 |
| 5 | 1,235.526907 |
| 10 | 2,471.053815 |
| 15 | 3,706.580722 |
| 20 | 4,942.107629 |
| 25 | 6,177.634537 |
| 50 | 12,355.26907 |
| 75 | 18,532.90361 |
| 100 | 24,710.53815 |
| 1,000 | 247,105.3815 |
Related conversions
Frequently asked questions
How many square kilometres are in 1 acre?
1 acre equals 0.004046856422 square kilometres.
What is the formula to convert acres to square kilometres?
Use km² = ac × 0.0040468564224. Multiply the number of acres by 0.0040468564224 to get square kilometres. Going the other way, divide by 0.0040468564224 (or multiply by 247.105381467).
What is 100 acres in square kilometres?
100 acres is 0.4046856422 square kilometres.