ToolNestAcres to Square Miles Converter
Convert acres to square miles instantly with our free area converter. 1 acre = 0.001563 mi² — type any value below and the result updates live.
Acres → Square Miles⇄ Swap: Square Miles → Acres
—
✓ Free forever · ✓ No signup · ✓ Runs in your browser.
Acres to Square Miles Formula
Square Miles = Acres × 0.001563 (Acres = Square Miles × 640)
Area conversion for real estate, construction, and land — square inches, feet, yards, meters, kilometers, and miles, plus acres and hectares for larger parcels.
Acres to Square Miles Conversion Table
| Acres | Square Miles | |
|---|---|---|
| 1 ac | = | 0.001563 mi² |
| 2 ac | = | 0.003125 mi² |
| 5 ac | = | 0.007812 mi² |
| 10 ac | = | 0.015625 mi² |
| 25 ac | = | 0.039062 mi² |
| 50 ac | = | 0.078125 mi² |
| 100 ac | = | 0.15625 mi² |
About Acres and Square Miles
An acre is 43,560 square feet — about 75% of an American football field. The US unit for land parcels.
A square mile is 640 acres — the unit for city and county areas in the United States.
Frequently Asked Questions
How many square miles are in one acre?
One acre equals 0.001563 square miles. Multiply any acres value by 0.001563 to convert it.
What is the formula for converting acres to square miles?
Square Miles = Acres × 0.001563. To reverse it: acres = square miles × 640.
How do I convert square miles back to acres?
Divide the square miles value by 0.001563 (equivalently, multiply by 640). Or use our square miles-to-acres converter going the other way.
Which is bigger, a acre or a square mile?
A square mile is bigger — it takes 640 acres to make one square mile.