Pool Volume Calculator — Gallons & Fill Time
Estimate rectangular, round, oval, or freeform pool volume in gallons and liters with average depth, fill time, and water cost.
Pool capacity is water-surface area × average water depth, converted from cubic feet to U.S. gallons. Rectangular, round, and oval presets estimate regular shapes, while known-area mode provides a first pass for freeform pools.
2,944 cu ft · 83,365 liters · 5.75 ft average depth · about 36.7 fill hours at 10 GPM.
- Water volume22023 gallons
Sloped floors, steps, benches, coves, sun shelves, and freeform walls can make actual capacity different from a simple geometric estimate.
Verify the pool manufacturer's documented capacity or a measured fill before using volume for chemical dosing, equipment sizing, or safety decisions.
Water bills can include tiered rates, sewer charges, drought restrictions, permits, or hydrant rules that are not represented by one price per 1,000 gallons.
Step by step
- 1
Choose the closest pool shape and measure the waterline dimensions rather than the outside of coping or walls.
- 2
Average several depth measurements when the floor is not a simple straight slope, and calculate separate sections when shapes differ.
- 3
Use the result for planning fill time and water cost, but confirm documented or measured capacity before chemical dosing or equipment decisions.
Check the estimate before you buy
Estimate pool water capacity in U.S. gallons and liters for rectangular, round, oval, and known-area freeform pools, plus fill time and water cost.
A 32 × 16 ft rectangular pool averaging 5.75 ft deep contains about 2,944 cubic feet, or roughly 22,023 U.S. gallons. At a measured 10 gallons per minute, a continuous fill would take about 36.7 hours.
How the calculation works
Rectangles use length × width, round pools use π × radius², and oval pools use π ÷ 4 × length × width. Surface area is multiplied by average water depth and by 7.48052 gallons per cubic foot.
Pool Volume Calculator — Gallons & Fill Time FAQ
How do I calculate average pool depth?
For a simple straight slope, add the shallow and deep water depths and divide by two. Benches, shelves, steps, multiple slopes, and irregular floors need separate sections or a documented capacity.
How many gallons are in one cubic foot?
One cubic foot is about 7.48052 U.S. gallons. The calculator uses that conversion after finding geometric volume.
Can I use this result to add pool chemicals?
Treat it as a planning estimate only. Confirm capacity from documentation or a measured fill and follow the chemical label, test results, and qualified pool guidance.
Why might actual fill time be longer?
Flow rate can change with pressure, hose size, simultaneous water use, restrictions, and source capacity. Measure actual gallons per minute when timing matters.
Reference: NIST Handbook 44 U.S. capacity and volume conversions. Results are practical estimates; complete labels, package directions, product specifications, and qualified professional advice take priority.