Men's Shirt Size Converter
A perfectly fitted dress shirt starts with the right neck measurement. Use our converter to translate between neck size, US/UK, EU, and letter sizes for a sharp, comfortable fit every time.
Quick Converter
| Neck (inches) | Neck (cm) | US / UK Size | EU Size | Letter Size |
|---|---|---|---|---|
| 14 | 35.5 | 14 | 36 | XS |
| 14.5 | 37 | 14.5 | 37 | S |
| 15 | 38 | 15 | 38 | S |
| 15.5 | 39.5 | 15.5 | 39-40 | M |
| 16 | 40.5 | 16 | 41 | M |
| 16.5 | 42 | 16.5 | 42 | L |
| 17 | 43 | 17 | 43 | L |
| 17.5 | 44.5 | 17.5 | 44-45 | XL |
| 18 | 46 | 18 | 46 | XL |
| 18.5 | 47 | 18.5 | 47 | XXL |
Click any row to highlight it. Sizes are approximate and may vary by brand.
How to Measure for a Dress Shirt
Neck Circumference
Wrap a tape measure around the base of your neck where a shirt collar would sit. Insert two fingers between the tape and your neck for comfort allowance. Round up to the nearest half inch.
Sleeve Length
Measure from the center back of your neck, across the shoulder, and down the arm to just past the wrist bone. Bend your elbow slightly while measuring. Standard sleeve lengths range from 32 to 37 inches.
Chest and Body Fit
Measure around the fullest part of your chest under your arms. Compare this to the shirt's body width. Slim fit shirts have 3-4 inches of ease, regular fit has 5-6, and relaxed fit has 7 or more inches beyond your chest measurement.
Understanding Shirt Fit Types
The same neck size can come in very different body cuts. Here is what each fit type means for your silhouette.
Slim Fit
Tapered through the chest and waist with 3-4 inches of ease. Best for lean builds. The shirt should contour close to the body without pulling at the buttons when seated.
Regular Fit
The classic cut with 5-6 inches of ease through the chest. Provides comfort for most body types and enough room to move freely without excess fabric billowing out.
Classic / Relaxed Fit
Generous cut with 7+ inches of ease. Designed for larger builds or those who prefer maximum comfort. Pairs well with a tucked style to manage extra fabric at the waist.
Extra Slim / Skinny
The most tapered cut with just 2-3 inches of ease. Designed for very slim builds. Check that you can sit and raise your arms without the shirt pulling before committing.
Frequently Asked Questions
What is the difference between neck size and collar size?
They are the same thing. Dress shirt sizes are based on the collar circumference, which matches your neck measurement plus comfort allowance. When a shirt is labeled 15.5/34, the first number (15.5) is the neck/collar size in inches and the second (34) is the sleeve length.
How should a dress shirt collar fit?
You should be able to comfortably fit two fingers between your neck and the buttoned collar. The collar points should lie flat against the shirt without curling, and the collar should not gap away from your neck when viewed from the side.
How do EU dress shirt sizes work?
European dress shirt sizes are the neck circumference in centimeters, rounded to the nearest whole number. A US size 15.5 (39.5 cm neck) corresponds roughly to EU 39 or 40. Some European brands use exact centimeter measurements while others round differently.
Are letter sizes (S, M, L) reliable for dress shirts?
Letter sizes are less precise than neck-and-sleeve measurements and vary widely by brand. For a casual shirt, letter sizes are acceptable. For a formal dress shirt that needs to fit precisely under a suit jacket, always use your exact neck and sleeve measurements for the best fit.
See How Your New Shirt Looks with AI
Found your size? Use our AI virtual try-on tools to preview how different dress shirt styles, colors, and fits will look on you before buying.
