Collar (in) to Collar (cm) size
The short answer
By the formula, Collar (in) 16.5 is Collar (cm) 42.
Collar sizes are the neck measurement: inches times 2.54, rounded to a whole centimetre. Shirt makers round differently at the top of the range, so check the label.
| Collar (in) | Collar (cm) |
|---|---|
| 14 | 36 |
| 14.5 | 37 |
| 15 | 38 |
| 15.5 | 39 |
| 16 | 41 |
| 16.5 | 42 |
| 17 | 43 |
| 17.5 | 44 |
| 18 | 46 |
| 18.5 | 47 |