Acres to Square Miles (ac to mi²)
Free online acre to square mile converter. Type a value, get an instant exact result — plus the formula, a ready-made conversion table, and reverse conversion.
AREA CONVERTER — INSTANT RESULT
Formula: multiply the acre value by 0.0015625 — i.e. mi² = ac × 0.0015625
Quick check: 1 ac = 0.0015625 mi²
Quick check: 1 ac = 0.0015625 mi²
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 |
How to convert acres to square miles
To convert acres to square miles, multiply the amount in acres by 0.0015625. For example, 10 ac = 0.015625 mi². To convert in the other direction, divide by the same factor, or use the ⇄ swap button above.
Convert between metric and imperial/US land area units, including the acre (43,560 ft² exactly) and hectare (10,000 m²) used worldwide for land measurement.
Frequently asked questions
How many square miles are in one acre?
One acre is exactly 0.0015625 square miles.
How do I convert ac to mi²?
Multiply the ac value by 0.0015625 to get mi². The converter at the top of this page does this automatically and works in both directions.
How much is 100 acres in square miles?
100 acres equals 0.15625 square miles.