Estimate the volume of your pool in gallons. Choose the shape, enter the dimensions and average depth, and the calculator converts to gallons. Each dimension has its own unit selector (in/ft/yd/m).
Pool volume in gallons starts with the water volume in cubic feet, then converts at 7.48 gallons per cubic foot. First find the surface area: length times width for a rectangle, pi times the radius squared for a round pool, or pi times the half-length times the half-width for an oval. The unit selector converts inches, feet, yards or meters for you.
Multiply the area by the average depth—for a pool that slopes from shallow to deep, that is the shallow plus deep depth divided by two. The result in cubic feet times 7.48 gives gallons. Knowing your gallons is essential for dosing chemicals, sizing a pump and heater, and ordering a liner.
Use the pool volume calculator to estimate gallons for chemical dosing, pump sizing and general pool planning. It supports rectangular, round and oval pools with separate shallow and deep depths.
Start with the calculator that matches how your material is sold: area, length, volume, count, weight or electrical load. Enter one work area at a time, use the unit selector beside each measurement, then review the order quantity and cost fields before comparing supplier quotes.
Most calculators can save the current estimate in your browser, reload named estimates, print a copy, switch to dark mode or create a shareable link. Those tools are intended for planning and communication; always confirm final quantities, coverage rates, density, code requirements and pricing with the supplier or contractor responsible for the work.