Convert Square Miles to Acres
Convert Square Miles (mi²) to Acres (ac) instantly and accurately.
Conversion Formula
ac = mi² × 640
About Square Miles
A square mile (mi²) is an imperial unit of area equal to a square with sides of one mile (5,280 ft × 5,280 ft). It is used for measuring large land areas like counties, states, and countries in the United States. Los Angeles covers about 503 mi², Rhode Island (smallest US state) is roughly 1,214 mi², and Alaska is about 665,384 mi². This unit is standard in American geography, land surveying, and regional planning.
About Acres
An acre is a traditional unit of land area used primarily in the United States, United Kingdom, and countries with British heritage. One acre equals 43,560 ft² or about 4,047 m². Historically based on the area a yoke of oxen could plow in one day, it remains the standard for measuring agricultural land, residential plots, and rural properties. A football field (without end zones) is roughly 1.32 acres, and most suburban house lots range from 0.25 to 1 acre.
Quick Reference Table
| Square Miles (mi²) | Acres (ac) |
|---|---|
| 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 |