Pool Volume Calculator
Find how many gallons and liters a rectangular, round, oval or kidney-shaped pool holds, with a sloping floor.
Change the values and press Calculate to work out your own figures.
Choose the shape and enter its sizes and depths.
Show the working
- volume = surface area × average depth
- average depth = (shallow + deep) ÷ 2
How to use it
Choose the shape and enter its sizes and depths.
Lengths can be decimals, fractions or tape entries such as 12' 6 1/2" (in feet or inches). Prices are optional.
Key facts
volume = surface area × average depth; average depth = (shallow + deep) ÷ 2 kidney/oblong area ≈ 0.45 × length × (long width + short width); 1 cu ft = 7.48052 US gal
Sloped floors
Averaging the shallow and deep ends is exact for a straight slope; hopper-bottom pools hold a little less.
Questions
How many gallons in a 10 ft round pool 4 ft deep?
About 2,350 gallons.
Formulas
volume = surface area × average depth; average depth = (shallow + deep) ÷ 2 kidney/oblong area ≈ 0.45 × length × (long width + short width); 1 cu ft = 7.48052 US gal
Sources
Limitations
- Material densities are typical values (the midpoint of the commonly published range); real loads vary with moisture, grading and compaction, so check with your supplier or type in their density.
- Tank results are the geometric volume; real tanks have wall thickness and fittings.