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Pool Volume Calculator
Compute swimming pool water volume in gallons and liters from its shape — rectangular, circular, or oval — and dimensions, including support for a sloped deep end.
🔒 This tool runs entirely in your browser. Your files are never uploaded to a server.
Volume (gallons)
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Volume (liters)
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How it works
- Pick your pool's shape and enter its surface dimensions.
- Enter the shallow and deep end depths — the tool averages them for a sloped-bottom estimate.
- Surface area × average depth gives volume in cubic feet, converted instantly to gallons and liters.
FAQ
How is average depth used for a sloped pool?
The tool averages the shallow and deep end depths and applies that flat average across the whole surface area — a standard simplification for pools with a fairly even slope. For pools with a very steep or unusual slope, the real volume may differ noticeably from this estimate.
How is an oval pool's area calculated?
It uses the ellipse area formula (π × half the length × half the width), which is a reasonable approximation for a typical oval pool shape, though real oval pools vary in exact curvature.
Why do I need to know my pool's volume?
Volume is the basis for dosing chemicals correctly (chlorine, algaecide, pH adjusters are all measured per gallon or liter), sizing a pump or heater, and estimating water and heating costs — most chemical product labels give dosing instructions per 10,000 gallons.
Quick estimate vs. a pool professional's measurement
| Feature | This calculator | Pool professional's survey |
|---|---|---|
| Instant estimate from basic measurements | ✓ | ✗ |
| Exact volume for irregular custom shapes | ✗ | ✓ |
Accurate enough for everyday chemical dosing; for a custom or freeform pool shape, get an exact measurement from your installer.