Acre to Square Mile (ac to mi²)
Convert ac to mi² — Area converter
Also written as ac to mi2.
One acre equals 0.0015625 mi², so to convert acres to square miles you multiply the value by 0.0015625. A acre is smaller than a square mile — going the other way, 1 mi² = 640 ac. For example, 10 ac = 0.015625 mi² and 50 ac = 0.078125 mi².
0.0015625Click to copy
1 ac = 0.0015625 mi²
Acre to Square Mile formula
1 Acre = 0.0015625 mi²
Worked examples
- 25 ac = 0.0390625 mi²
- 100 ac = 0.15625 mi²
Acre to Square Mile conversion table
| Acre (ac) | Square Mile (mi²) |
|---|---|
| 1 | 0.0015625 |
| 2 | 0.003125 |
| 3 | 0.0046875 |
| 5 | 0.0078125 |
| 8 | 0.0125 |
| 10 | 0.015625 |
| 12 | 0.01875 |
| 15 | 0.0234375 |
| 20 | 0.03125 |
| 25 | 0.0390625 |
| 50 | 0.078125 |
| 100 | 0.15625 |
| 250 | 0.390625 |
| 500 | 0.78125 |
| 1000 | 1.5625 |
Frequently asked questions
How many square miles are in one acre?
One acre equals 0.0015625 square miles (mi²).
How many acres are in one square mile?
One square mile equals 640 acres (ac).
How do you convert acres to square miles?
1 Acre = 0.0015625 mi². Use the calculator above for any value.
What is 5 ac in mi²?
5 ac = 0.0078125 mi².
What is 100 ac in mi²?
100 ac = 0.15625 mi².
What is 10 ac in mi²?
10 ac = 0.015625 mi².
What is 20 ac in mi²?
20 ac = 0.03125 mi².
Is a acre bigger than a square mile?
No. A acre is smaller — one acre equals 0.0015625 square miles, while one square mile equals 640 acres.