Pool Volume Calculator

Water volume for rectangular, circular, and oval pools or aquariums.

Pool Volume Calculator helps you water volume for rectangular, circular, and oval pools or aquariums. Enter length, width, and average depth, review the breakdown, and use the guidance below to understand what the number means — and what it does not. What the Pool volume calculator does Pool Volume Calculator is built for everyday questions — shopping, home, travel, hobbies, and tech. Water volume for rectangular, circular, and oval pools or aquariums. You enter length, width, and average depth, then Simple Calculators computes the result instantly. Defaults are chosen to be easy to read — change any field to match your situation. How the math works Choose the Pool shape and Length units: feet gives the answer in American gallons (3.785 litres each), metres gives it in litres. Enter the Length and Width (rectangle), Diameter (circle) or Long and Short diameter (oval), plus the Average depth. Volume = length × width × depth for a rectangle, π × radius² × depth for a circle, and π × half the long diameter × half the short diameter × depth for an oval. One cubic metre is 1,000 litres and one cubic foot is about 7.48 American gallons; imperial (UK) gallons of 4.546 litres are shown too…