Convert acre [ac] to square mile (US survey) Online | Free area Converter

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Acre [ac]


An acre (ac) is a unit of area commonly used in the United States and other countries for measuring land. One acre equals 43,560 square feet or about 4,047 square meters.

1 acre ≈ 0.4047 hectares or 0.004047 square kilometers.

Acres are often used to describe the size of farms, plots, and real estate.


Square Mile (US Survey)


The square mile (US survey) is a unit of area used in the United States for land measurement based on the US survey foot. It represents a square with sides 1 mile long, where a mile is defined using the survey foot rather than the international foot.


1 US survey mile = 5,280 US survey feet

1 square mile (US survey) ≈ 2.589998 km² (slightly different from the international square mile of 2.59 km²)


This unit is mostly used in land surveying and mapping within the US.



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