CALCULATOR · FREE免费 · Free

Pool Volume Calculator

Enter pool length, width and average depth to get cubic feet, gallons and liters; use it before dosing chemicals or sizing a pump.

Updated 2026-10-30 · Formula shown · No signup
--Volume · cu ft
--Water · gallons
--Water · liters

Estimates only; verify on site before ordering or building.

Example

ItemValueUnit
Length20ft
Width10ft
Average depth5ft
Volume1000cu ft
Water7480gallons
Water28317liters

Where people go wrong

  • Using the deepest point instead of average depth, which overstates the volume.
  • Mixing feet and meters in the same measurement.
  • Forgetting steps or a shallow shelf that displace water.

FAQ

How many liters are in a gallon?

One US gallon is about 3.785 liters; this page uses US gallons.

How do I calculate a round pool?

Use π × radius² × average depth, convert to cubic feet and multiply by 7.48.