Pool Volume Calculator
Calculate gallons from length, width, and average water depth. Set the shape factor to 1.00 for a rectangle or about 0.85 for an oval; measure water depth, not the wall height. Calculate it clearly with Figur.
How the pool volume calculator works
Calculate gallons from length, width, and average water depth. Set the shape factor to 1.00 for a rectangle or about 0.85 for an oval; measure water depth, not the wall height.
Method and assumptions
Figur converts the measurements you enter into area, volume, or material quantity using standard geometry formulas.
- Surfaces and depths are uniform unless you divide the project into separate sections.
- Waste allowance, manufacturer coverage, and package sizes should be checked before purchasing.
- Site conditions and installation requirements can change the final quantity.
Sources and references
No external data source is required: this calculator uses standard geometry formulas and the measurements you enter.
Worked example
One (1) rectangular pool measuring 30 × 15 ft with 5 ft average depth
It holds about 16,830 gallons.
Frequently asked questions
How do I find average depth?
Add the shallow and deep water depths and divide by two for a consistently sloped pool. For complex bottoms, average several depth measurements.
Is this exact enough for chemicals?
It is a useful estimate. Follow the chemical label, test the water, and make small adjustments rather than adding a full calculated dose at once.
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