Convert acres to square miles and square miles to acres instantly. Bidirectional area converter with formula and common values.
To convert acres to square miles, divide by 640. There are exactly 640 acres in one square mile, a relationship rooted in the US survey system.
| Acres | Square Miles |
|---|---|
| 40 | 0.0625 |
| 160 | 0.2500 |
| 320 | 0.5000 |
| 640 | 1.0000 |
| 1,280 | 2.0000 |
| 5,000 | 7.8125 |
| 10,000 | 15.6250 |
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One square mile equals exactly 640 acres.
Divide the number of acres by 640. For example, 320 acres ÷ 640 = 0.5 square miles.
A mile is 80 chains long, and a square mile is 80 × 80 = 6,400 square chains. Since one acre is 10 square chains, one square mile contains 640 acres.
A section of land is one square mile, which equals 640 acres. Townships in the US Public Land Survey System are divided into 36 sections.