Pool Water Volume by Shape
The gallonage every pool dose and heater tile takes as its input: gallons = surface area x average depth x 7.48052, average depth = (shallow + deep)/2. Rectangle area L x W, round pi(D/2)^2, oval (pi/4)L x W. A 32 x 16 ft rectangle 3 to 8 ft deep is 512 ft^2 x 5.5 ft = 2,816 ft^3 = 21,065 gal. A field estimate; a metered fill or plan takeoff is more exact.
Formula and source
gallons = surface_area x avg_depth x 7.48052 gal/ft^3; avg_depth = (shallow + deep)/2. Rectangle area = L x W; round = pi (D/2)^2; oval = (pi/4) L x W.
First-principles geometry with the 7.48052 gal/ft^3 conversion; the pool-volume method per the NSPF CPO Handbook (by name).
Audience
This tile is built for trades and the adjacent professions in the Water and Wastewater Operations group. The interactive calculator runs entirely in your browser. No account, no fee, no advertising, no tracking.
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Posture
Rough Logic answers the math question the working professional asks on the job. The site is a calm, fast, ad-free, account-free, ever-free reference. It does not interpret code. It does not replace the licensed professional. It does not store your inputs. The Authority Having Jurisdiction governs all installations and inspections.