Swimming Pool Volume Calculator

Multiply the surface area by the average depth to get cubic feet, then multiply by 7.480519 gallons per cubic foot. This tool does that for a rectangle, circle or ellipse automatically.

For a sloped floor it is the shallow depth plus the deep depth divided by two. A flat-bottom pool uses its single depth, so you can leave the Deep depth field blank.

For a round pool measure the diameter across the center. For an oval measure the full length and full width; the tool treats it as an ellipse, which is why an oval holds less than a rectangle of the same length and width.

Yes. Flip the unit toggle to m and the tool converts every field. It still reports the result in US gallons and liters, since those are the units chemical and heater math usually use.

Yes. Enter depths measured to the water surface, not the top of the coping, so the volume reflects the water you actually treat, filter and heat.

It is exact when the floor slopes in a straight line from shallow to deep. Pools with a flat shallow section, a hopper or steps hold a little less, so treat the figure as a close working estimate.

No. The calculation runs entirely in your browser with JavaScript. Nothing you type is uploaded, stored or logged, so you can use it offline once the page has loaded.

This tool reports US gallons, where one cubic foot is about 7.48 gallons. An imperial (UK) gallon is larger, so a UK figure would be roughly 17 percent lower for the same volume.

Use it to size chlorine, salt and pH adjustments and to check pump turnover. See the related pool chlorine, pool salt and pool heater calculators, all keyed to your gallons.