Men's Shirt Size Conversion (collar in cm and inches) | OhMyUnit

Men's Shirt Sizes

Match your collar measurement to the right size letter or EU number. Numeric sizes refer to neck circumference: 38 cm = 15 in, etc.

US	UK	EU	JP	Neck (in)	Neck (cm)	Chest (cm)
XS	XS	44	S	14	35.5	86
S	S	46	M	14.5	37	91
M	M	48	L	15	38	96
M	M	50	L	15.5	39.5	101
L	L	52	LL	16	41	106
L	L	54	LL	16.5	42	111
XL	XL	56	3L	17	43	116
XXL	XXL	58	4L	17.5	44.5	121

How to measure your collar

Wrap a soft tape measure around the base of your neck where the shirt collar sits, with one finger between the tape and your skin for comfort. Round up to the nearest 0.5 cm — most shirts come in half-inch (US) or 1 cm (EU) collar steps.

Quick reference

US S = EU 38–40 = collar 14.5–15.5 in (37–39.5 cm)
US M = EU 40–42 = collar 15.5–16 in (39.5–41 cm)
US L = EU 42–44 = collar 16.5–17 in (42–43 cm)
US XL = EU 44–46 = collar 17–17.5 in (43–44.5 cm)

FAQ

What does "slim fit" change? Slim-fit shirts have a narrower chest and waist for the same collar size. If you are between fits, size up in slim and stay true in regular.