How to calculate pool volume
Rectangle: L × W × depth × 7.48 · Round: π × (D ÷ 2)² × depth × 7.48
Worked example. Pool volume: 19,149 gallons.
Example inputs — Pool shape: Rectangle; Length or diameter (ft): 32; Width (ft, not used for round): 16; Average depth (ft): 5. Starting values are illustrative.
From George Guju, founder of Calculyn · Educational calculator guidance, not professional advice.
How it works
Work out the pool's volume in cubic feet, then multiply by 7.48 gallons per cubic foot. For a sloped floor, use the average of the shallow and deep ends.
Assumptions & limitations
- Results are rounded for display.
Formula and assumptions reviewed October 2026 by the Calculyn team. How we build our calculators
Frequently asked questions
Why do I need the volume?
Chemical doses, heaters and pumps are all sized by how many gallons the pool holds.