Convert Acre (ac) to Square Mile (mi²) instantly. Enter any value — result updates live.
Converting Acre to Square Mile is a common area conversion. One acre (ac) equals 0.00156249421 square mile (mi²). Acres are used for land measurement in the US, UK, and former British colonies.
This conversion is commonly needed for interior design and flooring, real estate and property buying, gardening and landscaping. Square miles measure large geographic regions, typically states, counties, and countries.
To put acre in perspective: Central Park in NYC (about 843 ac). In square mile, common references include San Francisco (about 47 mi²).
An acre was originally defined as the amount of land a team of oxen could plow in one day.
Population density is often expressed as people per square mile in the US and UK — Manhattan, for comparison, has a density of roughly 70,000 people per square mile.
People frequently convert between acre and square mile for:
| Acre (ac) | Square Mile (mi²) |
|---|---|
| 1 ac | 0.00156249421 mi² |
| 2 ac | 0.00312498842 mi² |
| 5 ac | 0.00781247104 mi² |
| 10 ac | 0.0156249421 mi² |
| 15 ac | 0.0234374131 mi² |
| 20 ac | 0.0312498842 mi² |
| 25 ac | 0.0390623552 mi² |
| 30 ac | 0.0468748263 mi² |
| 50 ac | 0.0781247104 mi² |
| 100 ac | 0.156249421 mi² |
| 200 ac | 0.312498842 mi² |
| 500 ac | 0.781247104 mi² |
| 1000 ac | 1.56249 mi² |