One of the most common men's sizes, a 101 cm chest is US 40 and the second body carried under INT M, so an M can mean a 96 or a 101 cm chest.
UK to EU conversion
A UK men's jacket plus ten gives the EU size, so UK 42 is EU 52 and UK 50 is EU 60 all the way up. The offset never moves because the EU centimetre steps and the UK inch steps stay in lockstep across mainstream sizes. Past the top of the chart big-and-tall lines take over, and there the clean plus-ten rule can slip as ranges are graded less consistently.
At this size, UK to EU
One size up from UK 40, EU moves 2 to EU 52 while UK rises 2 to UK 42, holding their spacing. Both UK 40 and EU 50 are whole numbers here, so nothing rounds. For UK 40, the EU column here runs EU 48, EU 50, EU 52, stepping two numbers at a time.
Size Chart UK US EU INT 34 34 44 XS 36 36 46 S 38 38 48 M 40 40 50 M 42 42 52 L 44 44 54 L 46 46 56 XL
Frequently Asked Questions Does UK 40 round up or down in EU? Round to the chest for a jacket and to the larger figure if chest and waist disagree; a drop-two cut assumes a smaller waist, which not every body follows.
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Note UK and US men's sizes are typically identical EU sizes are approximately UK + 10 Fit varies by garment type - jackets vs shirts vs casual Clothing sizes vary significantly by brand See a number that looks off? Report an error on this page.