How Many Gallons of Water Does the Average 21-Foot Swimming Pool Hold?

The average 48-inch-deep, 21-foot-round pool holds 13,500 gallons of water. Robelle states that a 52-inch-deep, 21-foot-diameter round pool holds 14,500 gallons.

The formula for calculating water capacity for round or oval pools, with all dimensions measured in feet, is: average depth x length x width x 5.9. For a square or rectangular pool, the calculation is: average depth x length x width x 7.5%. By accurately assessing water capacity, pool owners are able to estimate the amount and kind of chemicals required to clean the pool and maintain its pH balance.

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