Convert Acre to Square Mile
Use this free converter to change acres (ac) into square miles (mi²). Acre and square mile both measure area. As a quick reference, 1 ac equals 0.0015625 mi², and 1 mi² equals 640 ac.
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Square Mile (mi²)
0.0015625
1 ac = 0.0015625 mi²
Area conversion table
| Acre | Square Mile |
|---|---|
| 0.01 | 0.000015625 |
| 0.1 | 0.00015625 |
| 0.5 | 0.00078125 |
| 1 | 0.0015625 |
| 2 | 0.003125 |
| 3 | 0.0046875 |
| 5 | 0.0078125 |
| 10 | 0.015625 |
| 20 | 0.03125 |
| 25 | 0.0390625 |
| 50 | 0.078125 |
| 100 | 0.15625 |
| 1,000 | 1.5625 |
How to convert Acre to Square Mile
Multiply the acre value by 0.0015625 to get square miles.
- Enter the number of acres you want to convert.
- The converter instantly shows the equivalent value in square miles.
- Worked example: 15 ac × 0.0015625 = 0.0234375 mi².
- Use the swap button to reverse the conversion (square mile to acre).
About these units
Acre (ac)
- Definition
- An acre (ac) is a unit of land area equal to 43,560 square feet, or about 4,047 square meters.
- History
- Originally the area a yoke of oxen could plough in a day, it was standardised in medieval England.
- Current use
- Acres measure farmland and real-estate plots in the US and UK.
Square Mile (mi²)
- Definition
- A square mile (mi²) is the area of a square one mile on each side, about 2.59 square kilometers.
- History
- It derives from the statute mile of English origin.
- Current use
- Square miles express land area and population density in the US and UK.
Frequently asked questions
How many square miles are in a acre?
There are 0.0015625 mi² in 1 ac. To convert, multiply the number of acres by 0.0015625.
How do I convert acres to square miles?
Multiply the acre value by 0.0015625 to get square miles. For example, 10 ac = 0.015625 mi².
Is this acre-to-square mile converter free?
Yes. This converter is completely free, runs entirely in your browser, and requires no sign-up. Your inputs never leave your device.
Convert Acre to other area units
| Unit | 1 Acre equals |
|---|---|
| Square Meter (m²) | 4046.8564 m² |
| Square Kilometer (km²) | 0.0040468564 km² |
| Square Centimeter (cm²) | 40468564 cm² |
| Square Mile (mi²) | 0.0015625 mi² |
| Square Yard (yd²) | 4840 yd² |
| Square Foot (ft²) | 43560 ft² |
| Square Inch (in²) | 6272640 in² |
| Hectare (ha) | 0.40468564 ha |