What this calculator does
Turtle tank size works out minimum water volume for a pet turtle based on shell length. 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
FormulaGallons = shell length (in) × 10, plus 50% more volume per additional turtle
The inputs explained
| Field | What to enter |
|---|---|
| Shell length (in) | A number, measured in in. Starts at 6. |
| Number of turtles | A number. Starts at 1. |
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 shell length
Every other input is held at the calculator’s starting values while shell length varies. Select any row to load that scenario into the calculator.