What this calculator does
Well water volume works out water volume held in a well casing from its diameter and the water column depth. 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
FormulaVolume = π × (diameter/2)² × depth, converted from cubic inches using 231 in³ per US gallon
The inputs explained
| Field | What to enter |
|---|---|
| Casing diameter (in) | A number, measured in in. Starts at 6. |
| Water column depth (ft) | A number, measured in ft. Starts at 100. |
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 casing diameter
Every other input is held at the calculator’s starting values while casing diameter varies. Select any row to load that scenario into the calculator.
How the answer changes with casing diameter