Pool volume calculator
Every chemical dose starts with the volume. Measure the water, not the walls.
What next
- Green or cloudy? Work out a shock dose
- Salt chlorinator? Work out the salt
- Test the water twice a week and adjust chlorine and pH.
iPhone app · December 2026
Get the full plan in the app
Lido Pool turns every test into ordered steps for the products you own, tells you when you can swim, and reminds you what to do next.
How it is worked out
Rectangle: length × width × average depth. Round: π × radius² × depth. Oval: π/4 × length × width × average depth. 1 m³ = 1,000 litres; 1 ft³ = 7.48 US gallons. For a frame or inflatable pool, use the water depth (usually a little below the top), not the wall height.