Square Miles to Acres converter
Convert square miles (mi²) to acres (ac) — results update instantly as you type.
Square Miles to Acres
To
1 mi² = 640 ac
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How to convert Square Miles to Acres
Area measurements describe surfaces — from apartment floor plans in square meters or square feet to farmland in acres and hectares, and entire countries in square kilometers or square miles.
Every area unit is a length unit squared, which is why conversion factors are large: one acre equals exactly 4,046.8564224 square meters and one hectare is exactly 10,000 square meters.
Formula
mi² × 640 = ac
Multiply your square miles value by 640 to get acres. For the reverse, divide by the same factor.
Square Miles to Acres conversion table
| Square Miles | Acres |
|---|---|
| 1 mi² | 640 ac |
| 2 mi² | 1,280 ac |
| 5 mi² | 3,200 ac |
| 10 mi² | 6,400 ac |
| 25 mi² | 16,000 ac |
| 100 mi² | 64,000 ac |
Common use cases
- Real estate listings between square feet and square meters
- Farmland and plots between acres and hectares
- Country and city size comparisons
- Construction material coverage estimates
Frequently asked questions
One acre equals 43,560 square feet, or about 4,047 square meters — roughly 90% of an American football field.