Convert acres to square kilometers
1 ac = 0.00404686 km². Change the amount below, or read the formula and the reference table further down.
1 acre equals
square kilometers
1 ac = 0.00404686 km²
The formula
Acres and square kilometers both measure area from the same zero, so a single multiplier does the job.
km² = ac × 0.0040468564
Going the other way? Convert square kilometers to acres.
Acres to square kilometers table
Common values, rounded for reading.
| Acres (ac) | Square kilometers (km²) |
|---|---|
| 1 | 0.004047 |
| 2 | 0.008094 |
| 3 | 0.012141 |
| 4 | 0.016187 |
| 5 | 0.020234 |
| 6 | 0.024281 |
| 7 | 0.028328 |
| 8 | 0.032375 |
| 9 | 0.036422 |
| 10 | 0.040469 |
| 15 | 0.060703 |
| 20 | 0.080937 |
| 25 | 0.101171 |
| 30 | 0.121406 |
| 40 | 0.161874 |
| 50 | 0.202343 |
| 75 | 0.303514 |
| 100 | 0.404686 |
| 250 | 1.0117 |
| 500 | 2.0234 |
| 1,000 | 4.0469 |
Questions people ask
- How many square kilometers are in a acre?
- One acre equals 0.0040468564 square kilometers.
- How do I convert acres to square kilometers by hand?
- Multiply the number of acres by 0.0040468564. For a rough check, 0.004 is close enough for most everyday use.
- What is 1 acre in square kilometers?
- 1 acre is 0.00404686 square kilometers.
Calcuit generates this page from a unit table, so the factors here match every other page on the site.