Pool Volume Calculator
Calculate how many cubic meters and liters of water a rectangular pool holds, based on length, width and depth.
How to use the pool volume calculator
- Enter the length and width of the pool.
- Enter the average depth — if the pool has a sloped bottom (shallow at one end, deep at the other), use the average of the shallowest and deepest points.
- The calculator shows the water volume in cubic meters and liters.
How the pool volume is calculated
For a rectangular pool with a flat or sloped bottom, the volume is length times width times average depth:
One cubic meter equals 1,000 liters, so a pool of 25.2 m³ holds 25.2 × 1,000 = 25,200 liters of water.
Volume governs the dosage of everything you add
Pool volume is the starting point for all water treatment. Chlorine, pH adjusters and other chemicals are dosed per cubic metre of water, so a volume estimated too low leads to underdosing and poor disinfection, while an estimate that is too high produces harshly treated water that irritates skin and eyes. It is worth working the volume out carefully once and writing it down.
If the pool has a sloping floor, use the average depth — the shallowest and deepest points added together and divided by two — not the deepest. Volume also determines circulation: the pump should be able to turn over the entire body of water several times a day, so pump capacity is selected directly from the same figure.
Frequently asked questions
How do I calculate the volume of a pool with a sloped bottom?
Use the average of the shallowest and deepest depth as the "average depth" in the calculator. This gives a good estimate for most evenly sloping pools.
How much chlorine do I need based on the volume?
Dosing of chlorine and other chemicals depends on the product type and desired chlorine level — always follow the dosing instructions on the product based on your pool's volume in cubic meters, liters or gallons.