Need to know how many gallons your pool holds — for chemicals, a water delivery or a new pump? Pick the shape (rectangle, round or oval), enter the length and width or the diameter — or tap a common pool size — then enter the water depth. If your pool has a shallow end and a deep end, switch to Shallow + deep end and enter both. Measure to the water line, not the top of the wall. The calculator shows gallons, liters, how much 1 inch of water adds, and about how long a garden hose takes to fill it. Switch to Metric for meters and liters.

×ft
ft
–
Estimate only. Steps, benches, rounded corners and a diving hopper change the real volume — a sloped deep end usually holds a little more than the average shown. Above-ground pools are filled a few inches below the top of the wall. Check your pool's manual before dosing chemicals.

How it works: volume = surface area × average depth. Rectangle area = length × width; round = π × diameter² ÷ 4; oval = π × length × width ÷ 4. With a shallow and deep end, average depth = (shallow + deep) ÷ 2. One cubic foot holds 7.48 US gallons, so a 16 × 32 ft pool at 5 ft average is 2,560 cu ft ≈ 19,150 gallons. Metric: 1 m³ = 1,000 liters. Fill time assumes a garden hose at about 9 gallons (34 liters) per minute.