US to UK Men's Shirt Size Conversion
| US/UK Neck (in) | US/UK Neck (in) |
|---|---|
| 14 | 14 |
| 14.5 | 14.5 |
| 15 | 15 |
| 15.5 | 15.5 |
| 16 | 16 |
| 16.5 | 16.5 |
| 17 | 17 |
| 17.5 | 17.5 |
| 18 | 18 |
Sizing conventions vary by brand and by cut — this table shows the standard published conversion. Always check the garment's own size chart when one is available. See how these tables are compiled.
There is no arithmetic to do here at all: US and UK dress shirts both print neck circumference in inches on the identical scale, so a shirt tagged 15.5in in either country is the same physical collar. What actually catches a US shopper out ordering from a UK retailer is the sleeve field — American tags almost always pair neck with a sleeve range (16/34), while a British high-street shirt often prints neck alone and folds sleeve into a 'regular' or 'long' fit label instead.
If sleeve length matters to you and a UK listing does not give a number, run a tape from the bony point of your shoulder down to your wrist bone with your arm bent slightly at the elbow, then check that figure against the specific retailer's fit guide before ordering rather than assuming their 'regular' matches your usual US 34-inch sleeve.
Frequently asked questions
Do I need to convert my neck size at all buying from a UK shirtmaker?
No — US and UK dress shirts use the identical inch-based neck scale, so your usual number carries over directly. Check the sleeve field specifically, since it is handled differently between the two markets.
Why does a UK shirt sometimes not list a sleeve length?
British retailers more often fold sleeve length into a fit label like regular or long rather than printing an explicit number the way US tags almost always do — measure your own sleeve length if that detail matters.