What this calculator does
Round pen panel count works out fence panels needed to build a round training pen from its diameter and panel 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
FormulaCircumference = π × diameter; panels = ⌈circumference / panel length⌉
The inputs explained
| Field | What to enter |
|---|---|
| Pen diameter (ft) | A number, measured in ft. Starts at 60. |
| Panel length (ft) | A number, measured in ft. Starts at 12. |
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 pen diameter
Every other input is held at the calculator’s starting values while pen diameter varies. Select any row to load that scenario into the calculator.