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Square Foot (US Survey)


The square foot (US survey) is a unit of area based on the US survey foot, which is slightly longer than the international foot. It is mainly used in land surveying and mapping in the United States.



  • 1 US survey foot = 1200⁄3937 meters (approximately 0.3048006096 m)



  • 1 square foot (US survey) ≈ 0.0929034116 m²



This unit helps maintain consistency in US land measurements, especially in legal and cadastral contexts.


Square Perch


A square perch is a traditional unit of area, also known as a square rod or pole. It represents the area of a square with sides one perch (rod) long.



  • 1 perch (rod) = 16.5 feet



  • 1 square perch = 16.5 ft × 16.5 ft = 272.25 square feet ≈ 25.29 square meters



  • 160 square perches = 1 acre



Square perches were commonly used in land surveying and property descriptions, especially in the UK and older US records.




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