Square Miles to Acres
1 Square Mile = 640 Acres
Common amounts:
About the square mile to acre conversion
The square mile (mi²) and the acre (ac) are both units of area. Convert between area units — square meters, square kilometers, hectares, acres, square feet, square yards and square miles.
To convert square miles to acres, multiply by 640. To go back, multiply acres by 0.0015625.
Reference table
| Square Miles | Acres |
|---|---|
| 1 mi² | 640 ac |
| 5 mi² | 3,200 ac |
| 10 mi² | 6,400 ac |
| 25 mi² | 16,000 ac |
| 50 mi² | 32,000 ac |
| 100 mi² | 64,000 ac |
Need the reverse conversion? Convert Acres to Square Miles.
Convert Square Mile to other area units
Frequently asked questions
- How many acres is 1 square mile?
- 1 Square Mile equals 640 Acres. To go the other way, 1 Acre equals 0.0015625 Square Miles.
- What's the formula to convert square miles to acres?
- Multiply the number of square miles by 640 to get acres. For example, 10 square miles × 640 = 6,400 acres.
- Does this converter handle decimals and very large numbers?
- Yes. Type any real number, including decimals or values in the trillions. Math runs entirely in your browser — no server round-trip, no sign-up, and nothing to install.