Calculate how many gallons or litres of water a pool holds.
Calculated instantly in your browser.
How do you calculate the volume of a pool?
Rectangular pool: length × width × depth. Round pool: π × radius² × depth. Convert cubic feet to gallons using 1 ft³ = 7.48 US gallons. For example, a 32 ft × 16 ft pool with a 5 ft average depth holds about 19,150 US gallons. Use the average depth if the pool has a deep end, and dose chemicals accordingly.
Understanding your result
Knowing the volume lets you dose chlorine and other chemicals correctly. Use the average depth if the pool has a deep end.
Formula and method
Rectangular: length × width × depth. Round: π × radius² × depth. 1 ft³ = 7.48 US gallons.
Worked example
A 32 ft × 16 ft pool with a 5 ft average depth holds about 19,150 US gallons.
How to use this tool
- Choose the pool shape and units.
- Enter the dimensions and average depth.
- Press Calculate.
About the Pool Volume Calculator
The Pool Volume Calculator works out how much water a rectangular or round pool holds, in US gallons, imperial gallons and litres.
Explore all Productivity tools
Frequently asked questions
How do I find the average depth?
Add the shallow-end and deep-end depths and divide by two for a flat-sloped pool.