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Converter group

Common Converters

Area Converter

Result

... Acre = ... Square mile

Find the units to convert

Acre to Square mile Converter

Use this page to convert acre values into square mile, with background details, formulas, a worked example, and a quick conversion table.

Conversion formula

1 ac = 0.0015625 sq mi

1 sq mi = 640 ac

Example: 12 ac = 0.01875 sq mi

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Acre

An acre equals 43,560 square feet.

History: The acre originates from old agricultural land measures.

Current use: Acres are used for plots of land, farms, and zoning.

Also written as ac, acres.

Square mile

A square mile is the area of a square with side length one mile.

History: It follows from the mile as a long-distance customary unit.

Current use: Square miles are used for city, county, state, and regional land areas.

Also written as sq mi, mi2, sqmi, square miles.

Acre to Square mile table

Acre [ac]Square mile [sq mi]
0.01 ac0.000015625 sq mi
0.1 ac0.00015625 sq mi
1 ac0.0015625 sq mi
2 ac0.003125 sq mi
5 ac0.0078125 sq mi
10 ac0.015625 sq mi
20 ac0.03125 sq mi
50 ac0.078125 sq mi
100 ac0.15625 sq mi

Frequently asked questions

  • How many Square mile (sq mi) are in one Acre (ac)?

    One Acre equals 0.0015625 Square mile.

  • How do you convert Acre to Square mile?

    Multiply the Acre value by 0.0015625 to get the result in Square mile.

  • How do you convert Square mile back to Acre?

    Multiply the Square mile value by 640 to get back to Acre.

  • What is 12 Acre in Square mile?

    12 Acre equals 0.01875 Square mile.