Pool Volume Calculator
Find out how much water your pool holds. Choose the shape, enter the size and the depth at both ends, and see the volume in gallons, liters, and cubic feet.
US gallons
22,023
Check the highlighted fields to see your result.
- Cubic feet
- 2,944
- Liters
- 83,365
- Average depth
- 5.75 ft
Results are estimates for information only and do not constitute financial, medical, or legal advice.
How it works
The calculator finds the area of the pool's surface, multiplies it by the average depth, and converts the result to gallons. For a pool with a shallow and a deep end, the average depth is halfway between the two.
The formulas
- Rectangular: length × width × average depth
- Round: π × (diameter ÷ 2)² × average depth
- Oval: π × (length ÷ 2) × (width ÷ 2) × average depth
- Gallons = cubic feet × 7.48
Worked example
A rectangular pool is 32 × 16 ft, 3.5 ft deep at one end and 8 ft at the other.
- Average depth: (3.5 + 8) ÷ 2 = 5.75 ft.
- Volume: 32 × 16 × 5.75 = 2,944 cubic feet.
- Gallons: 2,944 × 7.48 ≈ 22,023 gallons.
Frequently asked questions
Why do I need to know how many gallons my pool holds?
Pool chemical doses, like chlorine, pH adjusters, and shock, are given per gallon of water. Knowing the volume also helps you size a pump and filter, plan how long filling will take, and estimate the water cost.
What if my pool has a sloped bottom?
Enter the depth at the shallow end and at the deep end. The calculator uses the average, which works well for a bottom that slopes evenly. Pools with a sudden drop or a sump hold a bit more.
Do I measure to the top of the wall?
Measure the depth to the water line, not the top of the wall. The water is usually a few inches below the coping, so using the wall height overestimates the volume.