ToolNestSquare Miles to Acres Converter
Convert square miles to acres instantly with our free area converter. 1 square mile = 640 ac — type any value below and the result updates live.
Square Miles → Acres⇄ Swap: Acres → Square Miles
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Square Miles to Acres Formula
Acres = Square Miles × 640 (Square Miles = Acres × 0.001563)
Area conversion for real estate, construction, and land — square inches, feet, yards, meters, kilometers, and miles, plus acres and hectares for larger parcels.
Square Miles to Acres Conversion Table
| Square Miles | Acres | |
|---|---|---|
| 1 mi² | = | 640 ac |
| 2 mi² | = | 1,280 ac |
| 5 mi² | = | 3,200 ac |
| 10 mi² | = | 6,400 ac |
| 25 mi² | = | 16,000 ac |
| 50 mi² | = | 32,000 ac |
| 100 mi² | = | 64,000 ac |
About Square Miles and Acres
A square mile is 640 acres — the unit for city and county areas in the United States.
An acre is 43,560 square feet — about 75% of an American football field. The US unit for land parcels.
Frequently Asked Questions
How many acres are in one square mile?
One square mile equals 640 acres. Multiply any square miles value by 640 to convert it.
What is the formula for converting square miles to acres?
Acres = Square Miles × 640. To reverse it: square miles = acres × 0.001563.
How do I convert acres back to square miles?
Divide the acres value by 640 (equivalently, multiply by 0.001563). Or use our acres-to-square miles converter going the other way.
Which is bigger, a square mile or a acre?
A square mile is bigger — one square mile equals 640 acres.