Convert Square Miles to Acres
One square mile equals 640 acres. Type any value to convert square miles to acres instantly — with a full reference table below.
Convert Square Miles to Acres
🔒 Converted in your browser — nothing you enter is sent anywhere.
Conversion formula
To convert square miles to acres, multiply by 640. One square mile equals 640 ac, and one acre equals 0.001563 mi².
Square Miles to Acres table
About converting Square Miles to Acres
Square Miles (mi²) and Acres (ac) are both units of area. The exact factor is 1 mi² = 640 ac, so multiply by 640 to go from square miles to acres (or divide to go back).
The conversion is exact and runs entirely in your browser. Need the reverse? Use the Acres to Square Miles converter, or the full unit converter for every unit at once.
Frequently asked questions
How many acres are in one square mile?
One square mile equals 640 acres.
How do I convert square miles to acres?
Multiply the number of square miles by 640. For example, 10 square miles = 6,400 acres.
What is 5 square miles in acres?
5 square miles is 3,200 acres.