Difficulty: Moderately Easy
Instructions
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Step 1
Calculate the circumference or width and length of the pool, and then measure the depth of the pool. To calculate volume you needed height, width and depth.
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Step 2
Use the appropriate multiplier. Rectangular, square and free-form swimming pools use a multiplier of 7.5. Round and oval pools have a multiplier of 5.9.
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Step 3
Apply this simple calculation: Length x Width x Average Depth x Multiplier = Gallons. For example, if your pool is 20-feet long, 10-feet wide and has an average depth of 6 feet, you'll need 1200 gallons of water (20 x 10 x 6).
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Step 4
If your pool is round, multiply Circumference x Average Depth X Multiplier. So a pool with a circumference of 60 feet with an average depth of 5 feet can contain 1770 gallons of water (60 x 5 x 5.9).
