Acres to Square Kilometers
Type a value in ac and the km² equivalent appears instantly.
How to convert ac to km²
Multiply the ac value by 0.004046856.
1 ac = 0.004046856 km²
Quick conversion table
| ac | km² |
|---|---|
| 1 | 0.004046856 |
| 2 | 0.008093713 |
| 5 | 0.020234282 |
| 10 | 0.040468564 |
| 20 | 0.080937128 |
| 50 | 0.202342821 |
| 100 | 0.404685642 |
| 500 | 2.023428 |
| 1000 | 4.046856 |
About the units
Acres (ac): 43,560 square feet, about 0.4 hectares. Land in the US and UK.
Square Kilometers (km²): One million m². Cities, lakes and countries.