Acres to Square Miles Converter
1 acre = 0.0015625 square miles
1 acre equals 0.0015625 square miles
How to convert acres to square miles
Area factors are squared length factors: 1 ft² = (0.3048 m)². The acre here uses international feet; historic US survey acres differ slightly.
mi² = ac × 0.0015625One acre is 0.0015625 square miles, so a single multiplication converts any value.
0.015625 mi² = 10 × 0.0015625Acres to square miles conversion table
Common values in acres, converted to square miles.
| Acres (ac) | Square miles (mi²) |
|---|---|
| 1 | 0.0015625 |
| 2 | 0.003125 |
| 3 | 0.0046875 |
| 4 | 0.00625 |
| 5 | 0.0078125 |
| 10 | 0.015625 |
| 20 | 0.03125 |
| 25 | 0.0390625 |
| 50 | 0.078125 |
| 100 | 0.15625 |
| 250 | 0.390625 |
| 500 | 0.78125 |
| 1,000 | 1.5625 |
About these units
acreac
Exactly 4,840 square yards, or 43,560 square feet. The customary land unit.
Reference: Derived from the international yard (1959).
square milemi²
Exactly 640 acres. Used for county and country areas.
Sources and precision
Table results are rounded to 8 significant digits; formula constants may be rounded to 10. Worked example answers use 6 significant digits. The converter starts at 6 significant digits and lets you change display precision. Calculations use the stored factors without intermediate rounding. Exact unit definitions do not make an input measurement more precise; conventional and measured factors follow the assumptions stated here.