How many gallons is my pool? Work it out from a sloped shallow-to-deep end for an in-ground pool, or pick a standard above-ground pool size.
Estimate only — above-ground figures are manufacturer-published approximates.
For an in-ground pool with a sloped floor, average depth is the shallow-end depth plus the deep-end depth, divided by two. Multiply length × width × average depth × 7.5 to get gallons. Above-ground pools use manufacturer-published capacity figures for standard round and oval sizes, since their wall shape isn't a simple rectangle.
Switch to the "Above-ground (preset)" tab and pick the closest published size — most above-ground pools are sold in a handful of standard round and oval dimensions.
Measure straight down at the deepest point of the pool floor, typically near the diving area if there is one.
The pool gallon calculator takes a single average depth for a quick estimate across rectangle, round, oval, or kidney shapes. This tool works from your actual shallow and deep end measurements, or a standard above-ground pool size.