ganak.appSuit Size Calculator
Free suit size calculator. Enter chest and waist measurements or use height and weight to find your suit jacket and pants size in US, UK, EU, and Italian systems. Includes jacket length, between-size guidance, sleeve reference for alterations, and complete international size charts.
Measure chest at the fullest point under your arms. Measure waist at the natural waistline. Sleeve length is measured from the center back of your neck, across the shoulder, down to the wrist bone. Height determines your jacket length (Short, Regular, Long, Extra Long) and pants inseam.
Jacket 40 Regular
Your chest measurement matches a US 40 (M/L).
Jacket Size Across Systems
International suit jacket size equivalents
US/UK
40
EU
50
IT
50
Length
R
Pants Size
Suit trousers sizing based on your waist
Waist
34
EU
50
Inseam
32"
Measurements Used
Chest and waist determine your size; sleeve is for alteration reference
Chest
40"
Waist
34"
Sleeve (ref)
33"
Suit Jacket Size Chart
Complete jacket size conversion across US/UK, EU, and IT systems
| US/UK | EU | IT | Label |
|---|---|---|---|
| 34 | 44 | 44 | XS |
| 36 | 46 | 46 | S |
| 38 | 48 | 48 | M |
| 40 | 50 | 50 | M/L |
| 42 | 52 | 52 | L |
| 44 | 54 | 54 | XL |
| 46 | 56 | 56 | XL |
| 48 | 58 | 58 | 2XL |
| 50 | 60 | 60 | 2XL |
| 52 | 62 | 62 | 3XL |
| 54 | 64 | 64 | 3XL |
| 56 | 66 | 66 | 4XL |
Suit Pants Size Chart
Suit trousers waist size conversion
| US Waist | EU |
|---|---|
| 28 | 44 |
| 29 | 44 |
| 30 | 46 |
| 31 | 46 |
| 32 | 48 |
| 33 | 48 |
| 34 | 50 |
| 36 | 52 |
| 38 | 54 |
| 40 | 56 |
| 42 | 58 |
| 44 | 60 |
| 46 | 62 |
| 48 | 64 |
| 50 | 66 |
How Suit Sizes Work
Understanding the relationship between body measurements and suit sizes
Suit sizes consist of two parts: a number and a letter. The number represents your chest measurement in inches (e.g., 40), and the letter indicates jacket length — S (Short), R (Regular), L (Long), or XL (Extra Long). So a "40R" means a 40-inch chest in regular length. Different countries use different numbering: US/UK use chest inches, while EU and Italian sizes add 10 to the US number.
Suit pants are sized separately by waist measurement. The "drop" — the difference between jacket and pants size — varies by brand (typically 6 inches). This calculator provides both jacket and pants sizing independently for the best possible fit.
Chest
Jacket Size
Measured around the fullest part of the chest under the arms
Waist
Pants Size
Measured at the natural waistline where trousers sit
Height
Jacket Length
Determines Short, Regular, Long, or Extra Long
How to Take Accurate Measurements
Step-by-step measurement guide for finding your suit size
1. Chest
Wear a dress shirt (not a thick layer). Wrap the tape around the fullest part of your chest, just under the armpits. Keep it level and snug — you should be able to fit one finger between tape and body.
2. Waist
Measure at your natural waistline, at or just below the belly button, where you wear your trousers. Stand relaxed and don't suck in. The tape should be snug but comfortable.
3. Sleeve Length (Reference)
Bend your arm slightly. Have someone measure from the center back of your neck, across the shoulder point, down the outside of the arm to the wrist bone. This does not affect your size — it is recorded for alteration reference.
4. Tips for Accuracy
Measure over a dress shirt, not a thick sweater. Stand straight with arms at your sides. Have a friend help with sleeve measurement. Measure twice for consistency.
International Suit Sizing Systems
How US, UK, EU, and Italian suit sizes compare
Suit sizing varies by region. A US 40 jacket has different labels in European and Italian systems. Understanding these conversions is essential when shopping from international brands.
US & UK Sizes
US and UK suit sizes are identical and based directly on chest measurement in inches. A 40 jacket means a 40-inch chest. This is the most intuitive system.
European (EU) Sizes
EU sizes add 10 to the US size. A US 40 is an EU 50. European brands like Hugo Boss and Zegna use this system. Sizes go up in increments of 2.
Italian Sizes
Italian sizes are the same as EU sizes (US + 10). A US 40 is an IT 50. Brands like Armani, Canali, and Brioni use Italian sizing.
Jacket Length
Length is separate from size and based on height. Short (up to 5'9"), Regular (5'10"–6'0"), Long (6'1"–6'3"), Extra Long (6'4"+). Not all lengths are available in all sizes.
Common Suit Sizing Mistakes
Avoid these pitfalls when determining your suit size
Measuring over a jacket or coat
Always measure over a dress shirt only. Measuring over a jacket or thick sweater can add 2-4 inches to your chest measurement, resulting in a suit that's far too large.
Confusing jacket size with shirt size
Dress shirt sizes (e.g., 15.5/34) measure neck and sleeve. Suit jacket sizes (e.g., 40R) measure chest and length. They are completely different systems.
Ignoring jacket length
A 40R and 40L are very different jackets. The wrong length means the jacket hem sits too high or low on your hips. Always factor in your height when selecting a suit.
Buying to match current weight goals
Buy a suit that fits your body now, not the body you plan to have. A well-fitting suit today looks better than an ill-fitting one you hope to grow into or slim into.
About the Suit Size Calculator
How suit size calculation works using body measurements
This calculator determines your suit size by matching your chest and waist measurements against standard size charts compiled from major suit retailers (Brooks Brothers, SuitSupply, Hugo Boss) with alignment to industry sizing conventions. It supports three international sizing systems (US/UK, EU, IT), provides jacket length recommendations based on height, and offers both measurement-based and height/weight-based calculation modes. Results include jacket size with length code, pants waist and inseam, between-size guidance, and complete international size charts for reference.
Frequently Asked Questions
Common questions about suit sizes, measurements, and international conversions