How the pool volume calculator works
It averages the shallow and deep end depths, then works out the floor area: length × width for a rectangle, π × radius² for a round pool, and π × half the length × half the width for an oval. Area × average depth gives cubic feet. One US gallon is 231 cubic inches, which works out at 7.48052 gallons per cubic foot, so the volume in cubic feet is multiplied by that number. Liters are the gallons multiplied by 3.78541.
Example: a 32 × 16 ft pool with a 3.5 ft shallow end and an 8 ft deep end has an average depth of 5.75 ft. That is 2,944 ft³, about 22,023 gallons or 83,365 liters.
Why the gallon count matters
Pool chemical doses are usually given per 10,000 gallons, so the volume decides how much of each product goes in. A pool of about 22,000 gallons takes roughly twice the dose of a 10,000 gallon pool. The volume also helps you judge filter turnover and how long the pump needs to run. The calculator does not give doses: read the product label and follow it, because strengths differ.
Measuring depth and shape
For a constant-depth pool, enter the same number for the shallow and deep ends. For a pool that slopes, measure the water depth at the shallow end and at the deepest point, not the wall height. Round pools are measured across the middle for the diameter. Oval and irregular pools are approximations: if the pool has steps, a sun shelf or a sloping floor that is not a simple wedge, the true volume will differ a little. Measure the water, not the deck.
Frequently asked questions
How many gallons does a 32 × 16 ft pool hold?
With a 3.5 ft shallow end and an 8 ft deep end the average depth is 5.75 ft, so the volume is 2,944 cubic feet, about 22,023 gallons or 83,365 liters.
How many gallons is a round 24 ft pool?
At a flat 4 ft depth it is 1,810 cubic feet, about 13,536 gallons or 51,241 liters.
What depth do I enter for a pool with one depth?
Enter the same number for the shallow and deep ends, for example 4 ft and 4 ft. The average is then exactly that depth.