Formula
ac to mi² conversion formula
Use this relationship for a direct conversion:
mi² = ac x 0.0015625
Worked example
2 ac = 0.003125 mi².
Values derived from exact metric and international length definitions.
Area conversion
Convert Acre to Square mile
1 acre (ac) equals 0.0015625 square mile (mi²). Enter any value below to convert from ac to mi².
Enter a value and choose units. Results update instantly.
1 ac = 0.0015625 mi²
All Area units
From 1 ac| Unit | Value |
|---|---|
| Square meter m² | 4,046.8564224 |
| Square kilometer km² | 0.0040468564 |
| Square centimeter cm² | 40,468,564.2239999995 |
| Square millimeter mm² | 4,046,856,422.4000005722 |
| Square inch in² | 6,272,640 |
| Square foot ft² | 43,560 |
| Square yard yd² | 4,840 |
| Square mile mi² | 0.0015625 |
| Acre ac | 1 |
| Hectare ha | 0.4046856422 |
Recent conversions
- Your recent conversions stay on this device.
Quick reference
Acre to Square mile table
| Acre (ac) | Square mile (mi²) |
|---|---|
| 0.01 | 0.000015625 |
| 0.1 | 0.00015625 |
| 1 | 0.0015625 |
| 2 | 0.003125 |
| 5 | 0.0078125 |
| 10 | 0.015625 |
| 25 | 0.0390625 |
| 50 | 0.078125 |
| 100 | 0.15625 |
| 1,000 | 1.5625 |
From unit
About the acre
Exactly 43,560 square feet.
Symbol: ac
To unit
About the square mile
The area of a square one mile on each side.
Symbol: mi²
Keep converting
Related conversions
Source
Conversion standard
Definitions are checked against NIST SP 811: Area units. Calculations use full internal precision before display rounding.
View the complete area converterQuestions
ac to mi² FAQ
How do you convert acre to square mile?
Use the formula mi² = ac x 0.0015625. 1 acre (ac) equals 0.0015625 square mile (mi²).
Is the ac to mi² conversion exact?
Both unit definitions use exact factors. Only the displayed decimal may be rounded.