Square miles to Acres – square mile to acre Converter
1 mi² = 640 acre
Formula
acre = mi² × 640
Square miles to acres conversion table
| square miles (mi²) | acres (acre) |
|---|---|
| 0.25 mi² | 160 acre |
| 0.5 mi² | 320 acre |
| 1 mi² | 640 acre |
| 2 mi² | 1280 acre |
| 5 mi² | 3200 acre |
| 10 mi² | 6400 acre |
| 20 mi² | 12800 acre |
| 50 mi² | 32000 acre |
| 100 mi² | 64000 acre |
| 200 mi² | 128000 acre |
| 500 mi² | 320000 acre |
| 1000 mi² | 640000 acre |
| 2500 mi² | 1600000 acre |
| 5000 mi² | 3200000 acre |
| 10000 mi² | 6400000 acre |
Square miles and acres are both area units. One square mile equals 640 acres; enter any value above for an instant result, or use the table for common conversions.
Sanity-check examples
1 mi² = 640 acre10 mi² = 6400 acre2.5 mi² = 1600 acre
Common pitfalls and look-alike units
The mu is a Chinese market unit: 1 mu = 666.667 m² (about 666.67), not to be confused with the acre (≈ 4046.86 m²) or the hectare (10000 m² = 15 mu). Confirm which unit a land figure uses before converting.
Frequently asked questions
How many acres are in a square mile?
1 square mile (mi²) equals 640 acre (acre).
How do I convert square miles to acres?
Multiply the square mile value by 640 to get acre — for example, 2 square miles = 1280 acre.
How do I convert acres back to square miles?
1 acre equals 0.0015625 square mile. Use the swap button or the reverse conversion page linked on this page.