Convert acres to square kilometers quickly and accurately using this free online converter
Used for land area, room size, and real estate measurements.
💡 Square meters are standard internationally; square feet are used in the US.
km² = ac × 0.00404686
Example: 1 ac × 0.00404686 = 0.00404686 km²
Use square meters internationally; square feet for US properties.
Common uses: real estate, land measurement, and floor plans.
How do I convert ac to km²?
Multiply the value in Acres by 0.00404686. For example: 10 ac = 0.040469 km².
When should I use Square kilometers instead of Acres?
Use square meters internationally; square feet for US properties.
Is this converter accurate?
Yes. We use internationally recognized conversion factors, updated to current standards.
| Acres (ac) | Square kilometers (km²) |
|---|---|
| 1 ac | 0.00404686 km² |
| 5 ac | 0.020234 km² |
| 10 ac | 0.040469 km² |
| 25 ac | 0.101171 km² |
| 50 ac | 0.202343 km² |
| 100 ac | 0.404686 km² |
| 500 ac | 2.0234 km² |
| 1000 ac | 4.0469 km² |