What this calculator does
Body frame size works out classifies frame size as small, medium or large from the height-to-wrist-circumference ratio. 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
Formular = height / wrist circumference (inches); compared against sex-specific small/medium/large bands
The inputs explained
| Field | What to enter |
|---|---|
| Sex | Choose from Female, Male. |
| Height (cm) | A number, measured in cm. Starts at 165. |
| Wrist circumference (cm) | A number, measured in cm. Starts at 15.5. |
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 height
Every other input is held at the calculator’s starting values while height varies. Select any row to load that scenario into the calculator.
How the answer changes with height
| Height (cm) | Frame size | Height-to-wrist ratio (r) | Bands used |
|---|---|---|---|
| 82.5 | Large frame | 5.32 | Small: r > 11 · Medium: 10.1 - 11 · Large: r < 10.1 |
| 124 | Large frame | 8.00 | Small: r > 11 · Medium: 10.1 - 11 · Large: r < 10.1 |
| 165 | Medium frame | 10.65 | Small: r > 11 · Medium: 10.1 - 11 · Large: r < 10.1 |
| 248 | Small frame | 16.00 | Small: r > 11 · Medium: 10.1 - 11 · Large: r < 10.1 |
| 330 | Small frame | 21.29 | Small: r > 11 · Medium: 10.1 - 11 · Large: r < 10.1 |
| 495 | Small frame | 31.94 | Small: r > 11 · Medium: 10.1 - 11 · Large: r < 10.1 |