π Clothing Size Converter
Convert top sizes between US, UK, and EU for men and women.
Equivalent Sizes
How to Use This Converter
Men\'s and women\'s clothing use completely different numbering, and the US, UK, and EU scales disagree with each other on top of that. Choose the fit, pick the system your size is in, enter the number, and see all three equivalents.
Select Men\'s tops or Women\'s tops. The two use different scales, so this choice changes the math.
Choose the system your size comes in: US, UK, or EU.
Enter the size number. The equivalents in the other two systems appear instantly.
Read the vanity sizing note below before ordering: brand charts beat any converter.
How the Systems Relate
Men\'s tops are the simple case: the US and UK both size by chest in inches, so the number is identical, and the EU size is just 10 higher (a 40-inch chest is EU 50). Women\'s tops use arbitrary numbered scales that differ by fixed offsets: the UK number runs 4 above the US, and the EU number runs 30 above the US. These are the standard conversion offsets used across the industry; individual brands deviate, which is exactly what vanity sizing is about.
Conversion Charts
Men\'s tops (chest measurement in inches):
Women\'s tops:
Worked Example
A man who wears a US 40 jacket converts to UK 40 and EU 50: the same number in the UK, plus 10 for the EU. A woman who wears a US 8 top converts to UK 12 (8 + 4) and EU 38 (8 + 30). Going the other direction, a European label reading EU 42 in women\'s is US 12 (42 - 30) and UK 16 (12 + 4).
The Vanity Sizing Caveat
Here is the uncomfortable truth: the numbers on clothing labels have drifted from real measurements. Brands quietly relabel garments with smaller numbers so shoppers feel good, a practice called vanity sizing, and it is worst in women\'s fast fashion. A "size 8" today can measure what a size 10 or 12 measured twenty years ago, and it varies brand to brand. That makes any converter, this one included, an approximation of the standard rather than a promise about a specific garment. For online orders, measure your chest or bust with a tape, compare against the retailer\'s own chart (not the generic one), and read reviews for "runs small" or "runs large" before you click buy.
Frequently Asked Questions
Is a US size 8 the same in every brand?
No. Vanity sizing means brands label garments with smaller numbers than the true measurements to flatter shoppers, and the practice varies wildly by brand and price point. A US 8 in one brand can measure like a US 10 in another. Conversions give the standard equivalent, but for online shopping always check the brand's own size chart and the garment measurements in inches or centimeters.
Why are men's US and UK sizes the same number?
Men's tops (shirts, jackets, suits) are sized by actual chest measurement in inches in both the US and the UK, so a 40-inch chest is a size 40 on both sides of the Atlantic. Continental Europe uses centimeters instead, which is why the EU number is 10 higher: a 40-inch chest is roughly 100 cm, halved to the EU size 50.
What is a women's US 8 in UK and EU?
A women's US 8 converts to UK 12 and EU 38. The women's offsets are fixed: UK is always US plus 4, and EU is always US plus 30. So US 10 is UK 14 / EU 40, and US 6 is UK 10 / EU 36.
What is a men's 40 in EU size?
A men's US/UK 40 converts to EU 50. For men's tops the rule is simple: EU equals US plus 10 across the whole range, from 34/44 up to 46/56.
Should I trust size conversion when shopping online?
Use conversion as a starting point, then verify against the retailer's size chart with your actual body measurements. Pay special attention to whether the chart lists body measurements or garment measurements: garment measurements include ease (extra room), so a shirt with a 42-inch chest measurement fits a 40-inch chest. Reviews that say "runs small" are worth half a size.