How to Calculate Swimming Pool Volume in Gallons

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By eHow Contributing Writer

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Anyone who has a swimming pool, understands the importance of calculating pool water volume. To use the correct amount of chemicals to keep the pool clean, you need to know how many gallons of water your pool holds.

Difficulty: Moderately Easy

Instructions

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.
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.
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).
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).