Pool Volume Calculator
Enter the pool shape, size and the shallow and deep end depths. The calculator uses the average depth to find the water volume in US gallons and liters.
Result
- Liters
- 83,365 L
- Cubic feet
- 2,944 cu ft
- Cubic meters
- 83.36 m³
- Average depth
- 5.75 ft
- Surface area
- 512 sq ft
Formula
- Average depth = (shallow depth + deep depth) ÷ 2
- Rectangular: volume = length × width × average depth
- Round: volume = π × (diameter ÷ 2)² × average depth
- Oval: volume = π ÷ 4 × length × width × average depth
- 1 cubic foot = 7.48052 US gallons
How the Pool Volume Calculator works
Pool volume is the surface area times the average water depth. For a floor that slopes evenly from the shallow end to the deep end, the average depth is the mean of the two.
One cubic foot of water is 7.48052 US gallons. Knowing the volume lets you dose chlorine, salt and other chemicals correctly.
Worked example
A rectangular pool 32 ft × 16 ft that goes from 3.5 ft to 8 ft deep has an average depth of 5.75 ft. Volume = 32 × 16 × 5.75 = 2,944 cu ft, which is 2,944 × 7.48052 = 22,023 gallons.
Frequently asked questions
How many gallons are in a 16 × 32 pool?
With an average depth of 5 feet, a 16 × 32 foot rectangular pool holds about 19,150 gallons. At 5.75 feet average depth it holds about 22,023 gallons.
How do I calculate gallons for a round pool?
Multiply 3.1416 by the radius squared and by the depth to get cubic feet, then multiply by 7.48. A 24 foot round pool 4 feet deep holds about 13,536 gallons.
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