Pool volume calculator
Choose your pool’s shape and enter its size in metres. You need the volume to dose chemicals and size a pump.
Measuring in feet and inches? Use the US version
Pool volume
48,000 litres
- Cubic metres
- 48 m³
- Average depth
- 1.5 m
- Time to fill
- 53.3 hours
How it works
The calculator finds the surface area for your shape: length × width for a rectangle, π × radius² for a round pool, and π × half-length × half-width for an oval. It multiplies that by the average depth to get cubic metres. Each cubic metre holds 1,000 litres.
To measure your hose’s fill rate, time how long it takes to fill a 10 litre bucket.
Example
With pool shape: rectangle, length 8 m, width 4 m, shallow end depth 1 m, deep end depth 2 m, fill rate 15 L/min, the answer is 48,000 litres.
Tips before you buy
- Measure to the water line, not the top of the wall.
- If the deep end is a short drop rather than a steady slope, measure the sections separately and add them.
- Write your pool’s volume down somewhere handy. Chemical doses are based on it.
Common questions
How many litres is an 8 × 4 m pool?
With depths from 1 to 2 m, about 48,000 litres.
How many litres are in a cubic metre?
1,000 litres.
How long does it take to fill a pool with a hose?
At 15 litres a minute, a 48,000 litre pool takes about 53 hours.