Convert Acres to Square Kilometers
One acre equals 0.00404686 square kilometers. Type any value to convert acres to square kilometers instantly — with a full reference table below.
Convert Acres to Square Kilometers
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How to convert Acres to Square Kilometers
To convert acres to square kilometers, multiply by 0.00404686. One acre equals 0.00404686 km², and one square kilometer equals 247.1054 ac.
- Take the value in acres — for example 7.5 ac.
- Multiply by 0.00404686 (the number of square kilometers in one acre).
- 7.5 × 0.00404686 = 0.0303514 km².
Quick mental estimate: Divide the number of acres by 247 (accurate to better than 0.05%).
Acres to Square Kilometers conversion table
| Acres | Square Kilometers |
|---|---|
| 1 ac | 0.00404686 km² |
| 2 ac | 0.00809371 km² |
| 3 ac | 0.0121406 km² |
| 5 ac | 0.0202343 km² |
| 10 ac | 0.0404686 km² |
| 20 ac | 0.0809371 km² |
| 50 ac | 0.202343 km² |
| 100 ac | 0.404686 km² |
| 200 ac | 0.809371 km² |
| 500 ac | 2.023428 km² |
| 1,000 ac | 4.046856 km² |
| 5,000 ac | 20.23428 km² |
| Square Kilometers | Acres |
|---|---|
| 1 km² | 247.1054 ac |
| 2 km² | 494.2108 ac |
| 3 km² | 741.3161 ac |
| 5 km² | 1,235.527 ac |
| 10 km² | 2,471.054 ac |
| 20 km² | 4,942.108 ac |
| 50 km² | 12,355.27 ac |
| 100 km² | 24,710.54 ac |
| 200 km² | 49,421.08 ac |
| 500 km² | 123,552.7 ac |
| 1,000 km² | 247,105.4 ac |
| 5,000 km² | 1,235,527 ac |
About converting Acres to Square Kilometers
Acres (ac) and Square Kilometers (km²) are both units of area. The exact factor is 1 ac = 0.00404686 km², so multiply by 0.00404686 to go from acres to square kilometers (or divide to go back).
The conversion runs entirely in your browser. Need the reverse? Use the Square Kilometers to Acres converter, or the full unit converter for every unit at once.
Real-world area in acres and square kilometers
| Example | Acres | Square Kilometers |
|---|---|---|
| A doubles tennis court (23.77 × 10.97 m) | 0.0644344 ac | 0.000260757 km² |
| An NBA basketball court (94 × 50 ft) | 0.107897 ac | 0.000436644 km² |
| An American football field (incl. end zones) | 1.322314 ac | 0.00535122 km² |
| A football pitch (105 × 68 m) | 1.764332 ac | 0.00714 km² |
| One acre | 1 ac | 0.00404686 km² |
“≈” marks typical values; the rest are defined or measured figures.
The units
43,560 square feet, exactly 4,046.8564224 m².
Used for: Farmland and property in the US, UK, India and Australia.
A square 1 km on each side — 1,000,000 m² or 100 hectares.
Used for: City, country and land areas.
Area factors are the squares of exact length factors, so they are exact too (an international acre is exactly 4,046.8564224 m²).