A land survey, or simply survey, is the scientific process of measuring the dimensions of a particular area of the earth's surface, including its horizontal distances, directions, angles, and elevations. Artificial structures, such as a road or building, may also be noted on a survey.

Take survey map and measure the length and breadth and then Multiply the length and width measurements to calculate the land area in square feet. As an example, if your land measured 1,000 feet by 1,500 feet, the land area would be 1,500,000 square feet. Divide the square footage by 43,560 to convert in into acres.