How to Calculate Gallons of Water Per Square Feet

Written by charlotte johnson
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How to Calculate Gallons of Water Per Square Feet
You can figure how many gallons of water are located in each cubic foot. (Swimming pool and pool house image by Jim Mills from

Understanding how many gallons are within a square foot of water is useful in determining the amount of water required to fill a structure such as a pool or a pond. Performing this calculation requires you to also know the depth of the area in which the water is located, as you need to have cubic feet to convert to gallons. If you have the depth, you can calculate the gallons of water per cubic foot by performing some simple mathematical operations.

Skill level:

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Things you need

  • Tape measure

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  1. 1

    Measure the depth of the structure in which the water is located. Use a tape measure to do this.

  2. 2

    Multiply the depth in feet times the width and length of the pool (square footage) to find the cubic feet. For instance, if the pool is 3 feet deep, 10 feet wide and 20 feet long, you would multiply 3 times the product of 10 times 20 to get 600 cubic feet.

  3. 3

    Multiply the cubic feet by the amount of water per cubic foot, which is 7.48 gallons. In this example, you would multiply 7.48 times 600 to get 4,488 gallons of water.

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