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Home & Garden — Pool
Pool Volume Calculator
Enter the shape and dimensions to get how many gallons and litres your pool holds.
round: ignored
Volume
—
Water the pool holds.
| Cubic feet | — |
|---|---|
| Litres | — |
| Surface area | — |
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Enter your figures above to see the step-by-step working.
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How the Pool Volume Calculator Works
Knowing how many gallons your pool holds is the key to dosing chemicals correctly, sizing a pump or heater, and estimating fill costs. Volume is the pool’s surface area times its average depth, in cubic feet, which you then convert to gallons — one cubic foot holds about 7.48 US gallons.
The surface area depends on the shape: length times width for a rectangle, π times the radius squared for a round pool, and π times the two half-axes for an oval. Use the average depth — for a pool that slopes from shallow to deep, that is roughly the shallow plus deep end divided by two.
gallons = surface area × average depth × 7.48
Frequently Asked Questions
How do I find my pool’s average depth?
Add the shallow-end depth to the deep-end depth and divide by two. For a pool that is 3 ft at one end and 7 ft at the other, the average depth is 5 ft.
How many gallons is my pool?
Multiply the surface area by the average depth to get cubic feet, then multiply by 7.48. A 32 by 16 ft rectangular pool with 5 ft average depth holds about 19,150 gallons.
Why do I need the volume in gallons?
Pool chemicals are dosed per gallon, and pumps and heaters are sized by volume. An accurate gallon figure keeps your water balanced and your equipment correctly matched.
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