How To Figure Out Square Feet

To find the square footage of something is the equivalent of asking the area of a two-dimensional shape or surface. Area is a measure of how much space something takes up in two dimensions. Generally, to determine area, you need two measurements: length and width. People use square footage for several reasons including estimating how much carpet or paint to buy or gauging how large their house is.

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Rectangle or Square

Step 1

Measure one side of the rectangle. As an example, one side measures 4 feet.

Step 2

Measure the adjacent side (not the opposite side) of the rectangle or square. In the example, the adjacent side measures 5 feet.

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Step 3

Multiply one measurement by the other to determine the square footage of the shape. In the example, 4 feet times 5 feet equals 20 feet squared, aka square feet.

Triangle

Step 1

Measure the base of the triangle. For example, say the base of a triangle measures 3 feet.

Step 2

Measure the height of the triangle, which is the distance from the base to the top point. In our example, the height of the triangle is 5 feet.

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Step 3

Multiply the base by the height and divide by two to determine the square footage of the triangle. In our example, 5 feet times 3 feet equals 15 square feet, which divided by two equals 7.5 square feet.

Circle

Step 1

Measure the diameter of the circle from one side of the circle to the opposite side of the circle. For example, a circle has a diameter of 10 feet.

Step 2

Divide the diameter by two to determine the radius. In our example, 10 feet divided by two equals a radius of 5 feet.

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Step 3

Square the radius. In our example, 5 feet squared equals 25 square feet.

Step 4

Multiply the radius squared by pi. In our example, 25 square feet times 3.14 equals 78.5 square feet.

Things Needed

  • Tape measure
  • Calculator (optional)

Cite This Article

MLA

McBride, Carter. "How To Figure Out Square Feet" sciencing.com, https://www.sciencing.com/figure-square-feet-6529806/. 24 April 2017.

APA

McBride, Carter. (2017, April 24). How To Figure Out Square Feet. sciencing.com. Retrieved from https://www.sciencing.com/figure-square-feet-6529806/

Chicago

McBride, Carter. How To Figure Out Square Feet last modified March 24, 2022. https://www.sciencing.com/figure-square-feet-6529806/

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