Pool Volume Calculator
How many gallons is your pool? Enter the size and average depth.
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Surface area—
Volume in cubic feet—
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How this calculator works
It multiplies length × width × average depth for the volume in cubic feet, then converts to gallons (one cubic foot holds about 7.48 gallons).
Worked example — a 32 ft × 16 ft pool, 5 ft average depth:
512 sq ft × 5 = 2,560 cubic feet × 7.48 = ≈19,150 gallons.
Use the average depth
For a pool with a shallow and deep end, average the two depths. Knowing the gallons is essential for dosing chlorine and other chemicals correctly.
Frequently asked questions
How do I calculate pool gallons?
Length × width × average depth × 7.48 for a rectangular pool.
Why does pool volume matter?
Every chemical dose — chlorine, shock, algaecide — is based on the number of gallons.
Planning an outdoor project
Outdoor quantities vary with site shape, access, drainage, soil conditions, and local material availability. Break irregular areas into simple sections, confirm the product specification with your supplier, and check permits or utility requirements before starting work.
How to use this estimate
- Measure the project in the units shown and recheck your measurements before ordering.
- Use the waste allowance as a planning buffer, not as a substitute for a detailed material takeoff.
- Compare the result with the package yield, coverage, or weight listed by your supplier.
- Prices are user-entered estimates and may change by location, product, delivery, and season.
Accuracy and limitations
Calculapedia provides educational planning estimates. It does not inspect your site, select products, guarantee quantities, or replace a contractor, engineer, architect, building official, or supplier. Confirm the final quantity and any safety or code requirements before buying or building.