1 acre (ac) = 0.0015625 square miles (mi²). To convert, divide by 640: mi² = ac ÷ 640. For example, 50 ac = 0.078125 mi².
mi² = ac ÷ 640
Acres to square miles table
| Acres (ac) | Square miles (mi²) |
|---|---|
| 10 | 0.015625 |
| 20 | 0.03125 |
| 30 | 0.046875 |
| 40 | 0.0625 |
| 50 | 0.078125 |
| 100 | 0.15625 |
| 200 | 0.3125 |
| 250 | 0.390625 |
| 500 | 0.78125 |
| 1,000 | 1.5625 |
| 2,500 | 3.90625 |
| 5,000 | 7.8125 |
| 10,000 | 15.625 |
The two units
Acre (ac). The international acre: 43,560 square feet. The older US survey acre is very slightly larger.
Square mile (mi²). 640 acres.
Because both units are defined in terms of the same base unit, the factor 0.0015625 is exact, not a rounded measurement.
Convert acres to other units
- Acres to square meters — 1 ac = 4,046.856422 m²
- Acres to square kilometers — 1 ac = 0.0040468564 km²
- Acres to square centimeters — 1 ac = 40,468,564.22 cm²
- Acres to hectares — 1 ac = 0.4046856422 ha
- Acres to square feet — 1 ac = 43,560 ft²
- Acres to square inches — 1 ac = 6,272,640 in²
- Acres to square yards — 1 ac = 4,840 yd²
Convert other units to square miles
Questions people ask
- How many square miles are in a acre?
- 0.0015625, exactly.
- How do you convert acres to square miles?
- mi² = ac ÷ 640. It is the same as dividing by 640.
- How do you convert square miles back to acres?
- ac = mi² × 640. See square miles to acres.
Results use the legal definitions of each unit and are checked against the Pint unit library. Display rounds to 10 significant digits. All unit conversions · More tools
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