Acres to Square kilometres Converter
Convert acre to square kilometre instantly. Type a value below — the result updates as you type.
When you need to convert acre to square kilometre
Area conversions are essential when buying land, ordering flooring, turf or paint, or comparing property listings that quote space in different units across regions.
Typical values: 0.5 ac is about 0.002 km², and 100 ac works out to roughly 0.4047 km². Because the ratio is fixed at 0.004, you can scale any amount linearly — doubling the acres doubles the square kilometres.
Estate agents, builders and gardeners each favour different area units, so a quick conversion keeps quotes and material orders consistent.
How to convert acre to square kilometre
One acre equals 0.004 square kilometres. To convert, multiply the number of acres by 0.004:
square kilometres = acres × 0.004
For example, 10 acres × 0.004 = 0.0405 square kilometres.
Acres to square kilometres conversion table
| Area (ac) | Square kilometres (km²) |
|---|---|
| 1 ac | 0.004 km² |
| 2 ac | 0.0081 km² |
| 3 ac | 0.0121 km² |
| 5 ac | 0.0202 km² |
| 10 ac | 0.0405 km² |
| 20 ac | 0.0809 km² |
| 50 ac | 0.2023 km² |
| 100 ac | 0.4047 km² |
FAQ
How many square kilometres are in a acre?
One acre = 0.004 square kilometres.
How do I convert square kilometres back to acres?
Divide by 0.004, or use the square kilometres to acres converter.