What this calculator does
Belt size works out belt size to buy from a waist measurement, using the standard buckle allowance. 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
FormulaBelt size = waist measurement + 2 inches, the standard allowance for the buckle and overlap
The inputs explained
| Field | What to enter |
|---|---|
| Waist measurement (pant size or tape reading) (in) | A number, measured in in. Starts at 34. |
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 waist measurement (pant size or tape reading)
Every other input is held at the calculator’s starting values while waist measurement (pant size or tape reading) varies. Select any row to load that scenario into the calculator.