Men's Clothing Size Converter
Use this men's clothing size converter for jackets, suits and shirts across the US/UK, EU and Italian systems, plus letter sizes (S, M, L, XL). Men's sizing is largely based on chest measurement, so enter your chest size in inches and see the matching numeric and letter sizes for international shopping.
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Convert a men's size
Enter values above and press Calculate to see your result.
Formula used
Men's jacket and suit sizes are built around the chest measurement:
EU size ≈ US/UK chest (inches) + 10
So a 40-inch chest is roughly an EU 50. Letter sizes map to chest ranges: S ≈ 36″, M ≈ 38–40″, L ≈ 40–42″, XL ≈ 44″. The calculator matches your input to the nearest standard row and shows the equivalents.
Worked examples
40″ chest ≈ EU 50, IT 50, letter L.
EU 48 ≈ 38″ chest, letter M.
44″ chest ≈ EU 54, letter XXL.
How to use this calculator
- Choose the system you know your size in (US/UK chest inches, EU, or IT).
- Enter the number — your chest in inches, or the EU/IT size.
- Press Calculate for the equivalents and letter size.
- Measure your chest to confirm against the retailer's chart.
Men's size conversion chart
| US/UK chest (in) | EU | Italy | Letter |
|---|---|---|---|
| 34 | 44 | 44 | XS |
| 36 | 46 | 46 | S |
| 38 | 48 | 48 | M |
| 40 | 50 | 50 | L |
| 42 | 52 | 52 | XL |
| 44 | 54 | 54 | XXL |
| 46 | 56 | 56 | 3XL |
Jacket sizes also carry a length (S/R/L); this chart covers chest size only.
Who should use this converter
Men shopping from international retailers for jackets, blazers, suits or shirts, and anyone buying a gift who knows the size in a different system. It's especially useful when European labels use numbers very different from the US chest inches you're used to.
How to measure your chest
Wrap a tape measure around the fullest part of your chest, under the arms and across the shoulder blades, keeping it level and snug but not tight. Breathe normally. That measurement in inches is your US/UK jacket size and the basis for the conversions.
Jacket length and fit
- Length: jackets come in Short (S), Regular (R) and Long (L) for the same chest — pick by your height and torso.
- Fit: slim, regular and classic cuts fit the same chest size differently.
- Shirts are often sized by neck and sleeve separately from chest letter sizes.
Limitations of this converter
This converts chest-based sizes to the nearest standard and provides a letter size. It doesn't capture jacket length, cut, or shirt neck/sleeve sizing, and brands vary. Confirm with the retailer's size chart and your measurements before buying.
Frequently asked questions
What is a 40 inch chest in EU sizes?
A 40-inch chest is approximately an EU 50 (and a letter size L). Add about 10 to the chest inches for the EU number.
How do men's letter sizes map to chest size?
Roughly: S ≈ 36″, M ≈ 38–40″, L ≈ 40–42″, XL ≈ 44″. Cut and brand shift these a little.
How do I measure my chest size?
Measure around the fullest part of your chest, under the arms, with the tape level and snug. The inch figure is your US/UK jacket size.
Are men's size conversions exact?
They're matched to standard charts and rounded. Always check the specific brand's chart and consider the jacket length and fit.
What does the S/R/L on a jacket mean?
It's the length — Short, Regular, or Long — for the same chest size, chosen by your height and proportions.