SIZE CHARTS · MEN

Men's size chart.

Letter sizes, suit jackets and shirt collars, lined up across the US, UK, Europe, Japan, Korea and China.

Updated 23 October 2026 · By the Delve to Life editors · Editorial standards · How we built these tables

THE QUICK ANSWER

Men's sizes are built on the chest. Your US/UK suit size is your chest in inches (rounded to an even number); add 10 for the EU/Italian size. A US M fits a 38–40 in chest; Japanese and Chinese M is usually a size smaller.

Letter sizes by chest

Letter (US/UK)	Chest	Chest (cm)
XS	32–34 in	81–86 cm
S	35–37 in	89–94 cm
M	38–40 in	97–102 cm
L	41–43 in	104–109 cm
XL	44–46 in	112–117 cm
XXL	47–49 in	119–124 cm
3XL	50–52 in	127–132 cm

Suit jackets and outerwear across countries

US / UK	EU / Italy	Japan	Korea	China	Letter
34	44	S	85	165/84A	XS
36	46	M	90	170/92A	S
38	48	M	95	175/96A	M
40	50	L	100	175/100A	M
42	52	L	105	180/104A	L
44	54	LL	110	185/112A	XL
46	56	3L	115	185/116A	XL
48	58	3L	120	190/120A	XXL
50	60	4L	125	190/124A	3XL

Convert FromSize

Jacket lengths: short, regular, long

Length	Your height	Example
Short (S)	under 5'8" · 173 cm	40S
Regular (R)	5'8"–6'0" · 173–183 cm	40R
Long (L)	over 6'0" · 183 cm	40L

Dress shirt collar sizes

US / UK (in)	EU (cm)
14	36
14.5	37
15	38
15.5	39–40
16	41
16.5	42
17	43
17.5	44
18	45–46
18.5	47

Japanese men's sizes by chest

Japan	Chest
S	80–88 cm
M	88–96 cm
L	96–104 cm
LL	104–112 cm
3L	112–120 cm
4L	120–128 cm

Want your exact sizes? Enter chest, waist, neck and height and we'll do every country at once.

Open the size calculator

How we built these tables

Each country sizes clothes against a table of body measurements, so we compare countries through the body, not through the labels. UK, US and Australian women's sizes follow a large UK online retailer's published body chart; German, French and Italian sizes follow a large German retailer's chart (French is two numbers above German, Italian four). Japanese sizes follow the bust steps of the JIS standard, Chinese codes follow GB/T 1335 (height/bust or chest plus body type), and Korean sizes use the usual 44–99 (women) and 85–125 (men) chest numbers. Shoe sizes follow a major US sportswear brand's men's and women's charts.

Brands cut differently, so treat every result as your starting size and check the brand's own chart when it has one. Weight isn't part of any national size standard: two people of the same height and weight can be two sizes apart, so we use a tape measure, not the scales.

Questions people ask

What size is a men's medium?

A men's medium usually fits a 38–40 in (97–102 cm) chest. In suits that's a 38 or 40, and EU/Italian 48–50.

How do I convert US suit sizes to European?

Add 10: a US/UK 40 jacket is an EU or Italian 50.

What do S, R and L mean on a suit?

They're jacket lengths: Short for roughly under 5'8" (173 cm), Regular for 5'8"–6'0", Long for over 6'0" (183 cm). 40R is a 40 chest in regular length.

How are shirt collar sizes measured?

Measure round the base of your neck with a finger under the tape and round up to the next half inch. A 15.5 in collar is a 39–40 cm EU collar.

Why do Asian brands run small?

Japanese, Korean and Chinese letter sizes are set for local body measurements, so they're often one size smaller than US letters. Check the chest measurement, not the letter.

What does a Chinese size like 175/96A mean?

175 cm tall, 96 cm chest, A body type (average difference between chest and waist). Y means slimmer waist; B and C are fuller.

What does 3L mean in clothing sizes?

3L is a Japanese size one step above LL (Japan's XL). It fits a chest of about 112–120 cm (44–47 in), roughly a US XL to XXL. 4L is one step bigger, about a US 3XL.

What size is a 46 chest?

A 46 in (117 cm) chest is a men's XL in US letter sizes and a 46 suit jacket (EU/Italian 56). In Japanese sizing it's a 3L.