Square Kilometers to Acres
A square kilometer is one million square meters, used for city, country, and large land area comparisons. An acre is 4,840 square yards, roughly the size of a football field, the traditional unit for land area in the US and UK. 1 km² equals ≈247.105 ac, so converting between them is a matter of multiplying by that fixed factor — type any value into the converter below and both sides update instantly as you type.
Both units belong to area, measured here against area's base unit (m²) — every other area unit on this site converts through that same reference point, which is why the table below can also be read as a quick cross-check against nearby values.
Formula
ac = km² × ≈247.105
km² = ac × ≈0.00404686
Worked example: 5 km² × ≈247.105 = ≈1,235.53 ac.
Conversion table
| Square Kilometer (km²) | Acre (ac) |
|---|---|
| 1 km² | ≈247.105 ac |
| 2 km² | ≈494.211 ac |
| 3 km² | ≈741.316 ac |
| 5 km² | ≈1,235.53 ac |
| 10 km² | ≈2,471.05 ac |
| 20 km² | ≈4,942.11 ac |
| 25 km² | ≈6,177.63 ac |
| 50 km² | ≈12,355.3 ac |
| 100 km² | ≈24,710.5 ac |
| 250 km² | ≈61,776.3 ac |
| 500 km² | ≈123,553 ac |
| 1,000 km² | ≈247,105 ac |
Frequently asked
- How many Acres in a square kilometer?
- 1 km² equals ≈247.105 ac.
- How do I convert Square Kilometers to Acres?
- Multiply the value in km² by ≈247.105 to get ac. The converter above does this instantly as you type.
- Is the conversion exact?
- Yes — Square Kilometer and Acre are both defined by a fixed conversion factor to area's base unit (m²), so the result shown is exact to the precision displayed, not an approximation.