Clothing Size Converter

Inputs

What are you sizing?

Gender

Applies to tops and trousers. Jacket and collar are men's only.

Chest / Bust circumference (cm)

Tops & jackets: measure around the fullest part of your chest.

Waist circumference (cm)

Trousers: measure around your natural waist (narrowest point).

Collar / neck size (US inches)

Dress shirts only. US/UK collar sizes are identical.

Results update as you type, and the address bar keeps your numbers so the link you share reopens this exact calculation.

Detailed results
Top — UK size	38
Top — Italian size	48
Jacket — UK size	—

Top — UK size

Top — Italian size

Jacket — UK size

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How this is calculated

Tops: chest circumference (cm) matched to standard EU/US/UK/IT size tables. Jacket: chest (cm) → EU jacket / US+UK jacket (EU jacket = US + 10). Collar: US neck inches × 2.54 ≈ EU collar cm (rounded to standard sizes). Trousers: waist (cm) → EU trouser / US waist inches.

Clothing size systems

EU vs US sizing:

| Item | EU rule | US/UK | |------|---------|-------| | Men's tops | EU 48 = M | M (chest ~97cm) | | Women's tops | EU 38 = S/6 | S / size 6 | | Men's jacket | EU 50 = chest ~107cm | US/UK 40 | | Collar | EU collar in cm | US/UK in inches | | Men's trousers | EU 50 = waist ~84cm | 34" waist |

Jacket and suit sizing

EU jacket sizes run 10 higher than US/UK: EU 50 = US 40 = UK 40. The number refers to chest circumference in cm for EU, or chest in inches for US/UK. A man with a 102 cm (40") chest wears EU 50.

Dress shirt collar sizing

US and UK collar sizes are identical (both in inches). EU collar is the neck circumference in centimeters. US 15.5" = EU 39/40. To convert: multiply US inches by 2.54 to get approximate EU cm.

How to measure

Chest/bust: Arms relaxed, tape around the fullest part
Waist: Around natural waist, not belt line
Neck/collar: Around base of neck, just below the Adam's apple, add 0.5cm for comfort

Assumptions

Based on standard EU/ISO sizing tables; actual fit varies significantly between brands.

Jacket/suit: US and UK sizes are treated as equivalent (both use chest in inches).

Trouser size shown is waist only — inseam varies by height and must be measured separately.

Collar conversion rounded to nearest standard EU collar size.

Frequently asked questions

›What is EU 50 jacket size in US?

EU 50 jacket = US 40 = UK 40. EU jacket sizes run exactly 10 higher than US/UK. So EU 52 = US 42, EU 48 = US 38, and so on.

›What is a 15.5 shirt collar in EU?

US collar 15.5" = EU collar 39/40 cm. US and UK collar sizes are identical. To convert US to EU: multiply by 2.54 (15.5 × 2.54 = 39.4 cm, rounded to EU 39/40).

›What is EU 48 in US men's shirt size?

EU 48 (men's shirt) = US Medium (M) = UK 38. This corresponds to a chest circumference of approximately 92–97 cm.

›What is size M in EU?

For men's tops: US M = EU 48 = UK 38. For women's: US M corresponds to EU 40–42 depending on the brand.

›Are UK and US clothing sizes the same?

For men's suits and dress shirt collars, yes — US and UK sizes are identical. For women's clothing, UK sizes are typically 4 numeric sizes higher than US (US 8 = UK 12). For men's casual tops, US and UK use the same letter sizes (S/M/L).

›What is Italian clothing size IT 50 in US?

Italian size IT 50 (men's) = EU 50 = US XL = UK 40. Italian luxury brands (Gucci, Prada, Armani) use EU-equivalent numeric sizing.