A square rod (US survey) is a unit of area measurement used in the United States for land surveying and legal property descriptions. It is different from the standard square rod or square pole and is based on the U.S. survey foot, which is a historical unit of length used in land surveying in the United States. The U.S. survey foot is slightly different from the international foot.
One square rod (US survey) is equal to 1/160th of an acre. In terms of area, this is approximately equal to 25.29285264 square meters (m²) or 0.00625 acres.
This unit is used in land-related applications, especially in the United States, where the U.S. survey square rod is employed for legal and historical reasons in land surveys, property descriptions, and land records. It's important to be aware of the specific units being used when dealing with land measurements in the United States to avoid discrepancies or errors.
A square chain is a unit of area measurement that is now considered obsolete and not commonly used. It was historically used in some English-speaking countries, including the United States and the United Kingdom, as part of the older system of land measurement.
One square chain is equal to an area of 10 square rods, or 484 square yards. In terms of square meters, one square chain is approximately equal to 404.68564224 square meters (m²).
The square chain was often used in land surveys and property descriptions in the past, but it has been largely replaced by the more standardized metric and imperial systems of measurement. In modern times, square meters and square feet are the more commonly used units for measuring land area.