US and UK shirts give the collar in inches. European brands give it in centimeters. Here’s the conversion, worked out at 2.54 cm per inch and rounded to the nearest whole centimeter.
| US collar (in) | UK collar (in) | EU collar (cm) |
|---|---|---|
| 14 | 14 | 36 |
| 14.5 | 14.5 | 37 |
| 15 | 15 | 38 |
| 15.5 | 15.5 | 39 |
| 16 | 16 | 41 |
| 16.5 | 16.5 | 42 |
| 17 | 17 | 43 |
| 17.5 | 17.5 | 44 |
| 18 | 18 | 46 |
| 18.5 | 18.5 | 47 |
| 19 | 19 | 48 |
| 20 | 20 | 51 |
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How we worked it out
Centimeters = inches × 2.54, rounded. Brands round differently, so some label 15.5 inches as 39 and others as 40. Always check the brand’s own chart before you buy.
Sleeve conversion
Multiply inches by 2.54 for centimeters. A 34-inch sleeve is about 86 cm, and a 35-inch sleeve is about 89 cm.
Have your size? See brands that sell exact collar and sleeve sizes. Not sure of your size? Use the calculator.
Quick answers
Are UK and US shirt sizes the same?
For collars, yes. Both use inches, so a 16 is a 16. Sleeve lengths are also in inches in both places.
How do I convert my collar size to centimeters?
Multiply inches by 2.54 and round. 16 inches is 40.6 cm, which most brands label 41.
Are Italian and German shirt sizes different?
Most continental European brands label the collar in centimeters, so the number works the same way. Body cut still differs by brand.
Related: Size chart · How to measure