Square Miles to Acres Converter
Convert square miles to acres instantly with this free online converter. Type a value and the result updates as you type. 1 square mile equals 640 acres, and it comes in handy for real estate, flooring, and land measurements.
menu_bookQuick Reference
- 1 acre = 4,047 m²
- 1 hectare = 10,000 m²
- 1 sq mile = 640 acres
- 1 sq ft = 0.0929 m²
lightbulbTip
Use the swap button to quickly reverse a conversion. Results update in real time as you type, so there is no need to press a button.
How to Convert Square Miles to Acres
To convert square miles to acres, multiply the value by 640 (or divide by 0.0015625). For example, 5 mi² × 640 = 3200 ac.
Square Miles to Acres Conversion Table
| Square Mile (mi²) | Acre (ac) |
|---|---|
| 0.25 | 160 |
| 0.5 | 320 |
| 1 | 640 |
| 2 | 1280 |
| 5 | 3200 |
| 10 | 6400 |
| 36 | 23040 |
| 100 | 64000 |
Frequently Asked Questions
How do you convert square miles to acres?
Multiply the square mile value by 640. For example, 5 mi² × 640 = 3200 ac. To convert back, multiply the acre value by 0.0015625.
How many acres are in 1 square mile?
There are 640 acres in 1 square mile. Going the other way, 1 acre equals 0.0015625 square miles.
What is 1 square miles in acres?
1 mi² equals 640 ac. Use the converter above for any other value, or scan the conversion table for common ones.
Related Conversions
Each page includes the formula, a reference table, and the live converter.