Square Miles to Acres Converter

Common

Square meters, acres, hectares and more.

How to convert Square Miles to Acres

Multiply the square miles value by 639.999: 1 mi² = 639.999 ac. Going the other way, 1 ac = 0.0015625 mi², so divide by 639.999 or use the Acres to Square Miles converter.

About these units

Square Miles (mi²)

A square mile is 640 acres, about 2.59 square kilometers. It is used for land areas in the United States.

Acres (ac)

An acre is 43,560 square feet, about 4,047 square meters or 0.405 hectares. Historically it was the area a team of oxen could plough in a day.

Square Miles to Acres conversion table

Square Miles (mi²)Acres (ac)
1 mi²639.999 ac
2 mi²1,280 ac
3 mi²1,920 ac
4 mi²2,560 ac
5 mi²3,200 ac
10 mi²6,399.99 ac
20 mi²12,800 ac
25 mi²16,000 ac
50 mi²32,000 ac
100 mi²63,999.9 ac
500 mi²320,000 ac
1,000 mi²639,999 ac

More square miles conversions

See every unit on the Area Converter.