What is a Clothing Size Converter?
The clothing size converter switches sizes between US, EU, and UK standards, and supports children's sizing as well.
How it's calculated
Sizing systems vary by region: some use body measurements directly (chest circumference in cm), others use letter sizes (S/M/L), and others use their own numbering systems entirely.
Units that are easy to mix up
| Units | Why it's confusing | How to tell them apart |
|---|---|---|
| Letter sizes (S/M/L) vs body measurements | No shared standard for letter sizes | Body-measurement systems are unambiguous by definition; S/M/L varies by brand |
| European women's sizing by country | Assumed to be unified across Europe | Italian, French, and German numbering don't match each other |
Why does sizing differ so much by country?
The core issue is that each system references a different 'average' body, and standardization arrived late and unevenly. Some markets use direct body measurements, which are unambiguous by definition, while letter sizes (S/M/L) are set independently by each brand, with no shared standard at all — which is exactly why S/M/L can vary noticeably between brands.
Women's sizing is particularly inconsistent due to 'vanity sizing' — the tendency for the same size label to correspond to increasingly larger actual measurements over time, driven by the psychology of wanting to fit into a smaller number.
Good to know
- Children's sizing conventions vary too — some systems size directly by height (cm), which is fairly intuitive, while age-based sizing (like '4T') can fit inconsistently since children of the same age vary a lot in size.
- Men's dress shirts often use a neck-to-sleeve-length notation (e.g., 15½–33), reflecting the two measurements that matter most for a tailored fit.
- Jeans sizing like W32-L30 refers to waist and inseam length in inches.
- European women's sizing varies country by country even within Europe — Italian, French, and German numbering don't match.
- The most reliable way to avoid a bad online purchase is to check the brand's actual measurement chart and compare it against a well-fitting garment you already own, rather than trusting the size label alone.
Frequently asked questions
Q. How do I compare sizes across brands?
Brand-specific size charts based on actual body measurements are more reliable than trusting a labeled size number, since conventions vary widely.
Q. What do jeans sizes like W32-L30 mean?
Waist and inseam length in inches. W32 is roughly an 81cm waist.
Q. Should I buy children's clothing by age?
Height-based sizing tends to be more accurate, since children of the same age can vary significantly in body size.