Convert Acres to Square Miles
One acre equals 0.0015625 square miles. Type any value to convert acres to square miles instantly — with a full reference table below.
Convert Acres to Square Miles
Converted in your browser — nothing you enter is sent anywhere.
How to convert Acres to Square Miles
To convert acres to square miles, multiply by 0.0015625. One acre equals 0.0015625 mi², and one square mile equals 640 ac.
- Take the value in acres — for example 7.5 ac.
- Multiply by 0.0015625 (the number of square miles in one acre).
- 7.5 × 0.0015625 = 0.0117188 mi².
Quick mental estimate: Divide the number of acres by 640 — that is exact.
Acres to Square Miles conversion table
| Acres | Square Miles |
|---|---|
| 1 ac | 0.0015625 mi² |
| 2 ac | 0.003125 mi² |
| 3 ac | 0.0046875 mi² |
| 5 ac | 0.0078125 mi² |
| 10 ac | 0.015625 mi² |
| 20 ac | 0.03125 mi² |
| 50 ac | 0.078125 mi² |
| 100 ac | 0.15625 mi² |
| 200 ac | 0.3125 mi² |
| 500 ac | 0.78125 mi² |
| 1,000 ac | 1.5625 mi² |
| 5,000 ac | 7.8125 mi² |
| Square Miles | Acres |
|---|---|
| 1 mi² | 640 ac |
| 2 mi² | 1,280 ac |
| 3 mi² | 1,920 ac |
| 5 mi² | 3,200 ac |
| 10 mi² | 6,400 ac |
| 20 mi² | 12,800 ac |
| 50 mi² | 32,000 ac |
| 100 mi² | 64,000 ac |
| 200 mi² | 128,000 ac |
| 500 mi² | 320,000 ac |
| 1,000 mi² | 640,000 ac |
| 5,000 mi² | 3,200,000 ac |
About converting Acres to Square Miles
Acres (ac) and Square Miles (mi²) are both units of area. The exact factor is 1 ac = 0.0015625 mi², so multiply by 0.0015625 to go from acres to square miles (or divide to go back).
The conversion runs entirely in your browser. Need the reverse? Use the Square Miles to Acres converter, or the full unit converter for every unit at once.
Real-world area in acres and square miles
| Example | Acres | Square Miles |
|---|---|---|
| A doubles tennis court (23.77 × 10.97 m) | 0.0644344 ac | 0.000100679 mi² |
| An NBA basketball court (94 × 50 ft) | 0.107897 ac | 0.000168589 mi² |
| An American football field (incl. end zones) | 1.322314 ac | 0.00206612 mi² |
| A football pitch (105 × 68 m) | 1.764332 ac | 0.00275677 mi² |
| One acre | 1 ac | 0.0015625 mi² |
“≈” marks typical values; the rest are defined or measured figures.
The units
43,560 square feet, exactly 4,046.8564224 m².
Used for: Farmland and property in the US, UK, India and Australia.
A square 1 mile on each side: 640 acres, about 2.59 km².
Used for: US/UK land and city areas.
Area factors are the squares of exact length factors, so they are exact too (an international acre is exactly 4,046.8564224 m²).