Pool gallons by size and shape

Approximate US gallons for common pool sizes at a typical average depth, using the standard multipliers (rectangular 7.5, round/oval 5.9 × length × width × average depth). Measure your own pool and use the volume calculator for an exact figure.

Rectangular pools (avg depth 4.5 ft)

Size (ft)Gallons
12 × 249,694
14 × 2813,195
16 × 3217,234
18 × 3621,812
20 × 4026,928
16 × 4021,542

Round / above-ground pools (avg depth 4 ft)

Diameter (ft)Gallons
123,384
155,287
187,614
2110,363
2413,535
2717,131
3021,149

Related calculators

Pool VolumeCalculate your swimming pool volume in gallons from its shape, length, width and depths. Rectangular, round, oval and kidney pools supported.Round / Above-GroundCalculate the volume of a round or above-ground pool in gallons from its diameter and water depth. Fast, accurate gallons for 15, 18, 24 and 27 ft round pools.RectangularCalculate a rectangular pool volume in gallons from its length, width and shallow and deep-end depths. The go-to gallons calculator for in-ground pools.