How do I convert a 15.5″ collar to EU sizing?

A 15.5-inch neck equals a European 39. The EU number is simply the neck circumference in centimetres, rounded to the nearest whole size.

What about sleeve length?

US and UK shirts quote sleeve length separately (e.g. 15.5/34). European shirts build sleeve length into the fit, so choose slim, regular or comfort fit instead.

Do Asian shirt sizes run smaller?

Yes. Japanese, Korean and Chinese shirts typically run one to two sizes smaller than their US equivalents through the chest and shoulders.

Converters

Men's Shirt Size Converter

Men's dress shirts are sized by neck circumference — inches in the US and UK, centimetres almost everywhere else. Convert your collar size instantly and cross-check against chest measurements for casual shirts and t-shirts.

Men's Shirts size chart

Men's Shirts size chart
INTL	US	UK	EU	AU	JP	KR	CN	IN	CA	MX	BR	IT	FR	RU	TR	ZA	Neck (in)	Neck (cm)
XS	14	14	36	14	36	36	36	36	14	36	36	36	36	36	36	14	14	36
S	14.5	14.5	37	14.5	37	37	37	37	14.5	37	37	37	37	37	37	14.5	14.5	37
S	15	15	38	15	38	38	38	38	15	38	38	38	38	38	38	15	15	38
M	15.5	15.5	39	15.5	39	39	39	39	15.5	39	39	39	39	39	39	15.5	15.5	39
M	16	16	41	16	41	41	41	41	16	41	41	41	41	41	41	16	16	41
L	16.5	16.5	42	16.5	42	42	42	42	16.5	42	42	42	42	42	42	16.5	16.5	42
L	17	17	43	17	43	43	43	43	17	43	43	43	43	43	43	17	17	43
XL	17.5	17.5	44	17.5	44	44	44	44	17.5	44	44	44	44	44	44	17.5	17.5	44
XXL	18	18	45	18	45	45	45	45	18	45	45	45	45	45	45	18	18	45

How to use this converter

Pick the garment category you are shopping for.
Choose the country or size system you already know, then the one you want to convert to.
Select your size — every supported country updates instantly.
Check the body-measurement columns to confirm the fit, then copy, print or share the result.

Why sizes differ between countries

Size labels come from national fit blocks developed decades ago from different population surveys. The US and UK use garment-based numbering, most of Europe derives sizes from body measurements in centimetres, and Japan, Korea and China use their own regional standards. Because no global standard exists, matching your measurements to the chart is always more reliable than matching the label.

Frequently asked questions

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