Square miles to Acres Converter
Convert square mile to acre instantly. Type a value below — the result updates as you type.
When you need to convert square mile to acre
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 mi² is about 320 ac, and 5 mi² works out to roughly 3200 ac. Because the ratio is fixed at 640, you can scale any amount linearly — doubling the square miles doubles the acres.
Estate agents, builders and gardeners each favour different area units, so a quick conversion keeps quotes and material orders consistent.
How to convert square mile to acre
One square mile equals 640 acres. To convert, multiply the number of square miles by 640:
acres = square miles × 640
For example, 10 square miles × 640 = 6400 acres.
Square miles to acres conversion table
| Area (mi²) | Acres (ac) |
|---|---|
| 1 mi² | 640 ac |
| 2 mi² | 1280 ac |
| 3 mi² | 1920 ac |
| 5 mi² | 3200 ac |
| 10 mi² | 6400 ac |
| 20 mi² | 12800 ac |
| 50 mi² | 32000 ac |
| 100 mi² | 64000 ac |
FAQ
How many acres are in a square mile?
One square mile = 640 acres.
How do I convert acres back to square miles?
Divide by 640, or use the acres to square miles converter.