Pool Volume Calculator: Round / Above-Ground (Gallons)

Gallons in a round or above-ground pool.

Formula

Gallons = π × (D/2)² × average depth × 7.48052 (≈ D² × depth × 5.875).

Worked example

Inputs: Diameter = 24 ft; Average water depth = 4.5 ft.

Gallons	15,228
Liters	57,646

FAQ

Water depth vs wall height?

Use actual water depth, usually a few inches below the wall top.

Sources

Geometry (volume/area formulas); no external constant needed
NIST: 1 US gallon = 231 cubic inches (7.48052 gal per cubic foot)

Pool Volume Calculator: Rectangular (Gallons)

More Pool calculators

Pool Volume Calculator: Oval (Gallons)

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Last reviewed 2026-10-11.