Men's Suit and Jacket Size Converter
Convert men's suit and jacket sizes between US/UK chest size in inches, chest in centimeters and EU sizes. Approximate: fit varies by brand.
· CalcFlow Editorial
40 in = 50 EU
Approximate: Suit and jacket sizes are approximate. The EU size is the chest measurement in centimeters divided by two, rounded to an even number, but cuts and fits vary by maker.
Results shown are estimates for informational purposes only. Nothing on CalcFlow is financial, tax, legal, or medical advice. Always consult a qualified professional before making important decisions.
Common Men's Suit Size Conversions
| US / UK size (chest, inches) | EU size | Chest (cm) |
|---|---|---|
| 36 in | 46 | 91 |
| 38 in | 48 | 97 |
| 40 in | 50 | 102 |
| 42 in | 54 | 107 |
| 44 in | 56 | 112 |
| 46 in | 58 | 117 |
| 48 in | 60 | 122 |
Popular Men's Suit Size Conversions
Formula
chest (cm) = US/UK size x 2.54; EU size = chest (cm) / 2, rounded to an even numberUnderstanding Men's Suit Size Conversion
In the US and UK a man's jacket size is the chest measurement in inches around the fullest part of the chest, so a 40 jacket fits a 40 inch chest. Continental Europe numbers jackets by half the chest measurement in centimeters, rounded to an even number, so a 40 inch (101.6 cm) chest is about an EU 50 or 52. Shirt, trouser and coat sizes use other conventions, so use this tool only for jackets and suits.
Tips and Best Practices
- 1Measure around the fullest part of the chest, under the arms, with a soft tape.
- 2Jackets also come in short, regular and long lengths, which do not change the chest size.
- 3Add a little room if you plan to wear a sweater underneath.
Real-World Example
A 42 inch chest is 106.7 cm, which is about an EU 54.
Common Mistakes to Avoid
- Using a shirt collar size for a jacket.
- Rounding an EU size to an odd number; sizes run in steps of two.
- Ignoring the shoulder fit, which matters more than the chest for tailoring.
How to Use
- Pick the unit you have in the left selector and the unit you want in the right selector.
- Type a number in either box; the other box updates instantly.
- Use the swap button to reverse the direction and Copy result to copy the answer.
Frequently Asked Questions
What is a US 40 jacket in EU?
How do I measure my jacket size?
Is a UK 42 the same as a US 42?
Sources: Common tailoring conventions (jacket size = chest in inches in US/UK; EU size = chest cm / 2). Approximate by nature.