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Square Miles To US Survey Acres Converter

Convert between Square Miles and US Survey Acres. Select a direction, enter a value, and compare results in the conversion table. US Survey Acres are based on the legacy U.S. survey foot.






0 ac (US survey)

Conversion Table

mi^2ac (US survey)

How This Converter Works

Convert between Square Miles (mi^2) and US Survey Acres (ac (US survey)). Select either direction to convert directly.

Formula or rule

US Survey Acres = Square Miles * 639.99744000256; Square Miles = US Survey Acres / 639.99744000256

Example

Input
1 mi^2
Calculation
1 * 639.99744000256 = 639.99744000256
Result
639.99744000256 ac (US survey)

Notes

Area factors use squared linear unit definitions, including the international foot and statute mile. US Survey Acres are based on 43,560 square U.S. survey feet and are intended for historical or legacy surveying; ordinary Acres use the international foot.

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