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The formula to calculate the square footage of an area that is square or rectangular in shape is length multiplied by width equals the area's square footage. For example, if a rectangular shaped room measures 11 feet in length and 13 feet in width, 11 multiplied by 13 equals 143 square feet.How do I calculate area?
To calculate the area of a planar object, you’ll need the formula for the object depending on the shape of the object. For example, to get the area of a rectangle, you multiply the width by the height, and to calculate the area of a triangle, you multiply the base by the height and divide by half.How do you find the square footage of a building?
Find the square footage of a building by taking basic measurements and using a mathematic equation. Measure the length of the first floor of the building by placing the end of the tape measure at the left edge of the building and extending it along the entire length of the building to the right edge.