Q:

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

A:

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.

## Keep Learning

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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## Related Questions

• A:

A 20-by-40-feet pool with an average depth of 5 feet holds 21,600 gallons of water. The same shape pool with an average depth of 6 feet holds 36,000 gallons.

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• A:

Cloudy water in swimming pools is usually caused by a chemical problem in the pool. A pool test kit is used to test the chemical balance of the water.

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• A:

The amount of gallons of water in a pool varies greatly depending on the size of the pool. The average in-ground backyard pool holds between 18,000 and 20,000 gallons of water.