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Acre (US Survey) [ac]


The acre (US survey) is a unit of area used mainly in the United States for land measurement, based on the US survey foot. It is slightly different from the international acre due to the foot definition.



  • 1 US survey acre = 43,560 US survey square feet



  • 1 US survey acre โ‰ˆ 4,046.87261 square meters



  • Slightly larger than the international acre by about 0.0005%.



It is commonly used in land surveying, real estate, and agriculture.



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) โ‰ˆ 2.589998 kmยฒ (slightly different from the international square mile of 2.59 kmยฒ)


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



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