US and UK men’s suit sizes are identical to each other; EU suit sizes run a consistent 10 higher — a US 40 is an EU 50.
Men's suit and jacket sizing is one of the more consistent conversions in this chart: the EU number is the US/UK chest size plus 10, all the way from a US 34 (EU 44) to a US 48 (EU 58). This tracks the chest measurement the jacket is cut for, so it holds steady across most mainstream brands.
Where suit sizing does vary is in cut and drop (the difference between chest and waist measurement) — the size number converts reliably, but "regular," "slim," and "long" fits differ enough between brands that trying a jacket on, or checking a brand's own chest/shoulder measurements, still matters.
| US | EU |
|---|---|
| 34 | 44 |
| 36 | 46 |
| 38 | 48 |
| 40 | 50 |
| 42 | 52 |
| 44 | 54 |
| 46 | 56 |
| 48 | 58 |
Clothing sizes are brand-assigned labels, not fixed measurements — use this as a starting point, not a guarantee.
A US 40 suit is an EU 50 — EU suit sizes are consistently 10 higher than the US/UK number.
Yes, across this chart’s full range (US 34–48) the EU size is a flat +10 — it’s one of the more reliable conversions in men’s clothing.
No — the size number converts the same way regardless of cut, but "slim," "regular," and "long" fits vary enough between brands that you should still check shoulder and chest measurements for fit.