Free pool volume calculator: find how many gallons your pool holds for rectangular, round, or oval shapes using length, width or diameter, and average depth.
Important: This pool volume calculator uses average depth and simple geometric shapes. Sloped floors, spa spillovers, and irregular freeform pools need a site measure or builder spec—do not rely on this alone for chemical dosing at opening day.
Summary: Pick a pool shape, enter length, width or diameter, and average depth (ft). You get gallons, liters, cubic feet, plus depth scenario rows—gallons are the usual unit for chlorine and shock labels.
Pool Volume Calculator
Estimate pool gallons for balancing chemistry, heater sizing, and pump turnover conversations. This pool volume calculator supports rectangular, round, and oval shells using average depth—not shallow-end / deep-end split unless you enter a blended average.
