Q:

How many gallons of water does the average 21-foot swimming pool hold?

A:

Quick Answer

The average 21-foot round pool with a depth of 48 inches holds 13,500 gallons of water. A 21-foot round pool with a depth of 52 inches holds 14,500 gallons, according to Robelle.

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Full Answer

Measuring all dimensions in feet, the formula to calculate water capacity for round or oval pools is: average depth x length x width x 5.9. The formula for a square or rectangular pool is: average depth x length x width x 7.5. Accurately calculating water capacity allows owners to determine the correct amount and type of chemicals necessary to clean the pool and maintain the water's pH balance.

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