What this calculator does
Tank & pool volume works out capacity of a rectangular or round tank in litres. Enter your own figures above and the answer updates as you type: nothing is fixed in the code, so the result reflects exactly the numbers you supply.
The formula this calculator evaluates is printed under the tool and explained below, so you can check the working by hand or reuse it in a spreadsheet.
The formula
FormulaRectangular: L×W×D×1000 litres; Round: πr²·D×1000
The inputs explained
| Field | What to enter |
|---|---|
| Shape | Choose from Rectangular, Round. |
| Length (or diameter) (m) | A number, measured in m. Starts at 8. |
| Width (rectangular only) (m) | A number, measured in m. Starts at 4. |
| Average depth (m) | A number, measured in m. Starts at 1.5. |
Worked examples
Every figure in the tables below is produced by this page’s own calculator at build time, so the numbers and the tool always agree. Select any row to load that scenario.
How the answer changes with length (or diameter)
Every other input is held at the calculator’s starting values while length (or diameter) varies. Select any row to load that scenario into the calculator.