Equivalent area
Your value in acres, square miles, and hectares.
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Area
Acres to Square Miles Calculator
Convert acres to square miles instantly — there are 640 acres in a square mile — with a full equivalents table and comparison chart.
Result
0.5 mi²
How it works
A square mile is a mile on each side, which works out to exactly 640 acres. Converting acres to square miles is a simple division.
square miles = acres ÷ 640
acres = square miles × 640
acres = square miles × 640
Worked example
320 acres equals 320 ÷ 640 = 0.5 square miles.
Frequently asked questions
How many acres are in a square mile?
Exactly 640 acres.
How do I convert acres to square miles?
Divide by 640 — 320 acres = 0.5 mi².