Work out how many gallons and litres your pool holds — rectangular or round, using the average of the shallow and deep ends.
What this calculator does
Pool volume drives every maintenance number you’ll ever use: chlorine and shock dosing, pump and filter sizing, heater run-times, even the water bill for a refill. Enter the pool’s shape and dimensions with the shallow- and deep-end depths, and this calculator averages the depth and returns gallons, litres, and the weight of the water — a figure that surprises most people.
How to use it
- Pick the shape: rectangular or round.
- Enter the dimensions in feet.
- Enter the shallow and deep end depths — the calculator averages them.
The formula
A worked example
A 30 × 15 ft pool sloping from 3 ft to 6 ft has an average depth of 4.5 ft: 30 × 15 × 4.5 × 7.48 ≈ 15,148 gallons — about 57,300 litres, weighing over 126,000 lb. That volume is the number every dosing chart on a chemical bottle asks for, which is why it’s worth calculating once and writing down.