Are US and UK men's clothing sizes the same?

For most numbered sizing (suit jackets, dress shirts measured by chest/collar size in inches), US and UK sizes are generally the same number. Letter sizes (S/M/L) are nominally aligned too, but the actual measurements a 'Medium' corresponds to can still vary between brands regardless of country.

How does EU sizing relate to a US/UK chest size in inches?

EU men's sizing typically runs about 10 higher than the equivalent US/UK chest size in inches (a US/UK 40 is roughly an EU 50) — this is an approximation based on common size charts; always check the specific brand's measurements, especially since the relationship isn't a fixed mathematical formula.

Men's Clothing Size Chart: US, UK, EU, and Measurements

Convert men's clothing sizes between US/UK, EU, and international S/M/L labels, with corresponding chest measurements in inches and centimeters.

Convert from

US/UK value

Convert to

EU: 44

Men's Clothing Size Chart: US, UK, EU, and Measurements
US/UK	EU	S/M/L	Chest (in)	Chest (cm)
34	44	XS	34-35	86-89
36	46	S	36-37	91-94
38	48	S/M	38-39	97-99
40	50	M	40-41	102-104
42	52	M/L	42-43	107-109
44	54	L	44-45	112-114
46	56	XL	46-47	117-119
48	58	XXL	48-50	122-127
50	60	XXXL	51-53	130-135

How to Measure

Measure your chest around the fullest part, with the tape under your arms and across your shoulder blades, keeping the tape horizontal. For shirts, also measure neck circumference at the base of the neck and sleeve length from the center back of the neck to the wrist for the most accurate fit.

Notes

Letter sizes (S/M/L) are the least precise — the chest range covered by 'Medium' varies noticeably between brands, sometimes by 2 inches or more. Numbered sizes (chest measurement in inches, common for dress shirts and suits) are more directly comparable across brands.

Frequently Asked Questions

Source: Compiled from common US, UK, and EU menswear size charts · see our methodology