Pool Volume Calculator
Pool water in litres and gallons for any shape and slope, plus fill time and cost.
About this tool
Choose the pool's shape and enter its length or diameter, its width (for a kidney pool, both end widths), and the shallow and deep end depths. Add the flow of your hose and the price of water to see how long the pool takes to fill and what the water costs. Results are shown in litres, cubic metres, US gallons and imperial gallons.
How pool volume is calculated
Volume is the surface area Γ average depth, where the average depth is the shallow and deep ends added together and halved. Rectangular pools are length Γ width, round pools Ο Γ radiusΒ², oval pools Ο Γ half the length Γ half the width, and kidney pools use the trade approximation 0.45 Γ (sum of the two end widths) Γ length. A 10 Γ 5 m pool sloping from 1 m to 2 m holds 75 mΒ³, or 75,000 litres. At 20 litres a minute from a garden hose it takes about 62.5 hours to fill. In feet, a 32 Γ 16 ft pool from 3.5 to 8 ft deep holds about 22,000 US gallons, using about 7.48 gallons per cubic foot. A round pool 5.5 m across and 1.2 m deep holds about 28,500 litres. Knowing the volume matters for dosing chlorine, salt and pH chemicals, which are always quoted per litre or gallon, and for sizing a pump. Honest limits: steps, benches and curved floors change the true volume, so follow the chemical maker's instructions and test the water. The volume calculator handles other shapes, the unit converter switches units and the electricity cost calculator prices running the pump.
Frequently asked questions
How many gallons are in my pool?
Multiply length Γ width Γ average depth in feet by 7.48 for US gallons. A 32 Γ 16 ft pool with a 5.75 ft average depth holds about 22,000 gallons.
How many litres are in a pool?
Multiply length Γ width Γ average depth in metres by 1,000. A 10 Γ 5 m pool with a 1.5 m average depth holds 75,000 litres.
How long does it take to fill a pool with a hose?
Divide the volume by the hose flow. At 20 litres a minute, 75,000 litres takes about 62.5 hours.
Is my data saved?
No. The calculation runs in your browser and nothing is stored or sent.