Square Miles to Acres
Type a value — result updates instantly.
sqmi
acre
Quick reference
| Square Miles (sqmi) | Acres (acre) |
|---|
Formula
Acres = square miles × 639.99941
Multiply the square miles value by 639.9994069476087 to get acres. To reverse — divide acres by 639.9994069476087 to get square miles.
About this conversion
The square mile (mi²) is an imperial unit of area equal to 640 acres or approximately 2.59 km². Learn more →
The acre is an imperial unit of land area equal to 4,047 square meters or 43,560 square feet. Learn more →
Source: NIST International Reference