square mile to acre
1 square mile equals 640 acre, and 1 acre equals 0.0015625 square mile.
Conversion formula
ac = mi² × 640
To convert square mile to acre, multiply the value by 640.
Conversion table
| 1 mi² | 640 ac |
|---|---|
| 2 mi² | 1280 ac |
| 5 mi² | 3200 ac |
| 10 mi² | 6400 ac |
| 25 mi² | 16000 ac |
| 50 mi² | 32000 ac |
| 100 mi² | 64000 ac |
| 500 mi² | 320000 ac |
| 1000 mi² | 640000 ac |
Reverse conversion table
| 1 ac | 0.0015625 mi² |
|---|---|
| 2 ac | 0.003125 mi² |
| 5 ac | 0.0078125 mi² |
| 10 ac | 0.015625 mi² |
| 25 ac | 0.0390625 mi² |
| 50 ac | 0.078125 mi² |
| 100 ac | 0.15625 mi² |
| 500 ac | 0.78125 mi² |
| 1000 ac | 1.5625 mi² |
Key facts
| 1 square mile | 640 acre |
|---|---|
| 1 acre | 0.0015625 square mile |
Frequently asked questions
How do I convert square mile to acre?
Multiply the square mile value by 640 to get acre. For example, 10 square mile = 6400 acre.
How do I convert acre back to square mile?
Divide the acre value by 640 (equivalently, multiply by 0.0015625) to get square mile.
Reverse conversion
Printable A4 conversion cheat sheet — see the Downloads page