Area Converter
Square units, acres and hectares.
Conversion
Acres to Square Miles Converter
1 acre = 0.0015625 mi². Enter any value to convert acres (ac) to square miles (mi²), or use the table below for common values.
Formula
mi² = ac × 0.0015625
Example: 10 ac = 0.015625 mi². To convert the other way, use ac = mi² × 640.
Quick mental estimate: multiply by about 0.0016.
Acres to Square Miles conversion table
| Acres (ac) | Square Miles (mi²) |
|---|---|
| 1 ac | 0.0015625 mi² |
| 2 ac | 0.003125 mi² |
| 3 ac | 0.0046875 mi² |
| 4 ac | 0.00625 mi² |
| 5 ac | 0.0078125 mi² |
| 6 ac | 0.009375 mi² |
| 7 ac | 0.0109375 mi² |
| 8 ac | 0.0125 mi² |
| 9 ac | 0.0140625 mi² |
| 10 ac | 0.015625 mi² |
| 15 ac | 0.0234375 mi² |
| 20 ac | 0.03125 mi² |
| 25 ac | 0.0390625 mi² |
| 30 ac | 0.046875 mi² |
| 40 ac | 0.0625 mi² |
| 50 ac | 0.078125 mi² |
| 75 ac | 0.1171875 mi² |
| 100 ac | 0.15625 mi² |
| 250 ac | 0.390625 mi² |
| 500 ac | 0.78125 mi² |
| 1,000 ac | 1.5625 mi² |
About acres and square miles
The acre is 43,560 square feet (about 4,047 m²), the traditional unit for farmland and building plots in the US and UK.
The square mile is 640 acres, used for large land areas such as counties and national parks in the US.
Other Area conversions
Square Miles → AcresReverse conversionSquare Meters → Square Milesm² → mi²Square Kilometers → Square Mileskm² → mi²Square Inches → Square Milesin² → mi²Square Feet → Square Milesft² → mi²Square Yards → Square Milesyd² → mi²Acres → Square Metersac → m²Acres → Square Kilometersac → km²Acres → Square Inchesac → in²Acres → Square Feetac → ft²Acres → Square Yardsac → yd²Acres → Hectaresac → haHectares → Square Milesha → mi²
Frequently asked questions
How do I convert acres to square miles?
Use the formula mi² = ac × 0.0015625. For example, 10 ac = 0.015625 mi².
What is 1 acre in square miles?
1 ac = 0.0015625 mi².
How do I convert square miles back to acres?
Use ac = mi² × 640. 1 mi² = 640 ac.