Pool Volume Calculator
Outdoor & Pool · Updated July 2026
Enter your pool's length, width, and average depth to find how many gallons it holds — essential for chemicals, heating, and filling.
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Results
Estimates only. Add extra for waste and confirm with your supplier.
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How many gallons is my pool?
Multiply length × width × average depth in feet for cubic feet, then multiply by 7.48 to get gallons.
Finding your pool's gallons
Multiply length × width × average depth in feet for cubic feet, then multiply by 7.48 to get gallons. For a pool with a shallow and deep end, average the two depths first.
Why volume matters
Every chemical dose, heater sizing, and salt calculation depends on accurate gallons. Getting the volume right keeps your water balanced and avoids over- or under-dosing expensive chemicals.
How to use this calculator
- 1Measure length and width in feet.
- 2Find the average depth in feet.
- 3Read the volume in gallons.
Frequently asked questions
How do I find average depth?
Add the shallow-end depth and deep-end depth, then divide by two.
How do I calculate my pool's gallons?
Length × width × average depth (ft) × 7.48. A 32×16 ft pool averaging 5 ft holds about 19,150 gallons.
How do I find average pool depth?
Add the shallow-end and deep-end depths and divide by two.
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