International Clothing Sizes Explained: US, UK and EU Conversion
A plain-English guide to converting clothing sizes between the US, UK, EU and Italian systems, plus why you should always measure yourself and check the brand's own size chart.
Few things derail an online order quite like a size label from another country. Is a European 40 your size? What on earth is a UK 12 in American numbers? Scroll a checkout page from an overseas brand and the systems can feel designed to confuse. The good news is that they follow consistent, learnable patterns, and once you know them, converting takes seconds.
This guide covers the women's and men's conversions you will actually use, the quick rules worth memorising, and the one habit that matters more than any chart.
Women's clothing: the two patterns to remember
For women's wear, two simple rules cover the vast majority of conversions.
UK is roughly US + 4 and EU is roughly US + 32. So a US 6 is a UK 10 and an EU 38. Italian sizes run about four numbers above EU.
Here is how the common sizes line up across systems.
| US | UK | EU | Italy | Intl |
|---|---|---|---|---|
| 4 | 8 | 36 | 40 | S |
| 6 | 10 | 38 | 42 | S |
| 8 | 12 | 40 | 44 | M |
| 10 | 14 | 42 | 46 | M |
| 12 | 16 | 44 | 48 | L |
| 14 | 18 | 46 | 50 | L |
Men's clothing: letters and chest sizes
Men's tops and knitwear mostly use shared letter sizes, so a US medium is a UK medium. Europe uses numeric sizes based on chest measurement, where a medium lands around EU 48 to 50. Trousers are the easy category: men's sizing usually switches to waist in inches, which is refreshingly universal across countries.
| Intl | US / UK | EU | Chest |
|---|---|---|---|
| S | S | 46 | 36 to 38 in |
| M | M | 48 | 38 to 40 in |
| L | L | 50 | 40 to 42 in |
| XL | XL | 52 | 42 to 44 in |
The golden rule: measure yourself
Conversion charts get you to the right ballpark, but cut and vanity sizing mean two same-sized garments can fit completely differently. The reliable move is to know your own measurements and compare them to the brand's size chart, which is almost always given in centimetres or inches somewhere on the product page.
- Bust: around the fullest part, with the tape level all the way round.
- Waist: around the narrowest part of your torso.
- Hips: around the fullest part, feet together.
Knowing your body shape helps too, because it points you toward cuts that fit with less alteration in the first place.
Convert any size instantly. Pick the size you know and see it in US, UK, EU and Italian systems at a glance, for women's and men's clothing.
Open the Clothing Size ConverterWhy vanity sizing makes labels unreliable
If you have ever been three different sizes in one shopping trip, you are not imagining it. With no enforced standard, each brand sets its own measurements, and over the decades "vanity sizing" has quietly nudged labels downward so a garment measured as larger can carry a smaller number. The lesson is simple and liberating: the number on the tag is a suggestion, not a verdict. The measurements are the truth.
Buying from overseas: a quick checklist
- Convert the label to your own system to get the ballpark.
- Find the brand's size chart in centimetres or inches.
- Compare it to your own measurements, not just the letter or number.
- Read reviews for "runs small" or "runs large" notes, which are gold.
- Check the returns policy before you commit, especially across borders.
Save your bust, waist and hip measurements, plus your usual size in one trusted brand, in a note on your phone. Shopping anywhere in the world then becomes a quick comparison instead of a gamble.
The bottom line
Learn the two women's rules, UK is US plus 4 and EU is US plus 32, remember that men's tops share letters, and above all, measure yourself. Do that and an unfamiliar size label stops being a risk and becomes a quick calculation, which means fewer returns, less waste and far more clothes that actually fit when the parcel arrives.
Frequently asked questions
What is a US size 8 in UK and EU?
A women's US 8 is typically a UK 12 and an EU 40, roughly an Italian 44. The pattern holds across the range: UK is about US plus 4, and EU is about US plus 32.
Are UK and US clothing sizes the same?
No. For women's clothing, UK numbers run about four higher than US numbers, so a US 6 is a UK 10. For men's tops, US and UK letter sizes such as S, M and L generally match.
Why do sizes differ so much between brands?
There is no enforced sizing standard, and vanity sizing has drifted labels over time. Two garments both labelled medium can fit very differently, so compare the garment's measurements to your body rather than trusting the label.
How do I measure myself for clothing sizes?
Measure your bust at the fullest part, your waist at the narrowest point of your torso, and your hips at the fullest part. Compare those numbers to the brand's size chart, which is usually given in centimetres or inches.