1 acre 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
Values either side of 1 ac.
| Acres (ac) | Square kilometers (km²) |
|---|---|
| -4 | -0.016187 |
| -3.5 | -0.014164 |
| -3 | -0.012141 |
| -2.5 | -0.010117 |
| -2 | -0.008094 |
| -1.5 | -0.00607 |
| -1 | -0.004047 |
| -0.5 | -0.002023 |
| 0 | 0 |
| 0.5 | 0.002023 |
| 1 | 0.004047 |
| 1.5 | 0.00607 |
| 2 | 0.008094 |
| 2.5 | 0.010117 |
| 3 | 0.012141 |
| 3.5 | 0.014164 |
| 4 | 0.016187 |
| 4.5 | 0.018211 |
| 5 | 0.020234 |
| 5.5 | 0.022258 |
| 6 | 0.024281 |
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.