Acres to Square Miles Converter
Convert acres (ac) to square miles (sq mi), with the formula, a conversion table and exact factors.
Change the values and press Calculate to work out your own figures.
Enter an area, choose its unit and the unit you want. The answer is exact until it is shown, and the same value appears in every other unit.
Show the working
- 1 ac = 0.0015625 sq mi
- 1 × 0.0015625 = 0.0015625 sq mi
How to convert acres to square miles
1 sq mi = 640 ac, so divide by 640 to go from acres to square miles (1 ac = 0.0015625 sq mi).
sq mi = ac ÷ 640 ac = sq mi × 640
Worked example:
1 ac = 0.0015625 sq mi 5 × 0.0015625 = 0.0078125 sq mi
Acres to square miles table
| Acres | Square Miles |
|---|---|
| 1 ac | 0.0015625 sq mi |
| 2 ac | 0.003125 sq mi |
| 3 ac | 0.0046875 sq mi |
| 4 ac | 0.00625 sq mi |
| 5 ac | 0.0078125 sq mi |
| 6 ac | 0.009375 sq mi |
| 7 ac | 0.0109375 sq mi |
| 8 ac | 0.0125 sq mi |
| 9 ac | 0.0140625 sq mi |
| 10 ac | 0.015625 sq mi |
| 15 ac | 0.0234375 sq mi |
| 20 ac | 0.03125 sq mi |
| 25 ac | 0.0390625 sq mi |
| 30 ac | 0.046875 sq mi |
| 40 ac | 0.0625 sq mi |
| 50 ac | 0.078125 sq mi |
| 75 ac | 0.1171875 sq mi |
| 100 ac | 0.15625 sq mi |
| 250 ac | 0.390625 sq mi |
| 500 ac | 0.78125 sq mi |
| 1000 ac | 1.5625 sq mi |
About the units
- Acres (ac)
- Acres, a US customary unit. Definition: NIST Handbook 44 Appendix C (1 acre = 43,560 sq ft, international-foot based).
- Square Miles (sq mi)
- Square miles, a US customary unit. Definition: NIST Handbook 44 Appendix C (derived from the international mile).