An acre (ac) is a unit of area commonly used in the United States and some other countries, especially for measuring land area, particularly in the context of real estate and agriculture.
One acre is equivalent to 43,560 square feet or 4,840 square yards. In terms of square meters, it is approximately 4,046.86 square meters.
To provide some perspective, an acre is roughly the size of a football field, excluding the end zones. It is a common unit for describing land area in rural and suburban areas, as well as for determining the size of plots of land, farms, and other land parcels.
The "square foot (US survey)" is a unit of area used in the United States primarily for land surveying and mapping purposes. It differs from the standard square foot because it 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 foot (US survey) is equal to approximately 0.0929034119223 square meters (m²) or about 0.111111 square yards (yd²).
This unit is used in various land-related applications, particularly in the United States, where the U.S. survey foot and the square foot (US survey) are still employed for legal and historical reasons in certain land surveys and property descriptions. It's essential to be aware of the specific units being used when dealing with land measurements to avoid any discrepancies or errors.