Clothing Size Across US, UK, EU and International Charts: Why Centimetres Beat Letters

I bought a jacket from a UK retailer last winter, picked the size that "felt right," and spent two weeks waiting on a refund after it arrived two fingers too tight across the chest. That return-shipping fee bought me a small lesson: a size label is a guess until you check the body measurement underneath it. Letters and numbers vary by country, by brand, and even by the year the tag was printed. The centimetres do not.

This post is about how clothing size actually maps across US, UK, EU and international charts, where those charts quietly disagree, and why a tape measure plus a couple of body numbers will save you more money than any cheat sheet. If you want to skip the reading and just convert a size, the clothing size converter does the lookup and shows the chest, waist, or hip range every size is cut for.

The four systems you keep colliding with

Most online shopping forces you to translate between four numbering conventions, and they don't share a scale.

US sizes use even dress numbers for women (0, 2, 4, 6, 8…) and chest inches for men's tailoring (a US 40 suit is cut for a roughly 40-inch chest).
UK sizes for women run four numbers higher than US — a US 8 is a UK 12 — for historical reasons nobody fully agrees on.
EU sizes use a separate two-digit number entirely, where that same women's garment lands around EU 38.
International letter codes (XS, S, M, L, XL, XXL) sit on top of all of them and mean different body measurements depending on gender and garment.

So the reliable anchor is this: a women's US 8 is roughly a UK 12 and an EU 38, and that whole row is cut for about an 88 cm bust. Memorise the cm, not the trio of numbers, because the numbers shuffle the moment you change country or category.

Why the letter on the tag lies to you

A letter code only makes sense inside one garment type for one gender. Here is the trap that catches almost everyone:

A women's M top is cut for an ~88 cm bust.
A men's M top is cut for an ~96 cm chest.
A women's M in trousers is a ~72 cm waist — a completely different measurement.

Same letter, three different bodies. If you read "M" as a fixed thing, you will order a men's medium expecting your usual women's medium and get something built for a chest eight centimetres bigger.

Then there is vanity sizing — the slow drift where brands attach smaller numbers to the same physical garment so customers feel slimmer and buy more. There is no enforced legal standard forcing them to behave: EN 13402 in Europe, ASTM in the US, and GB/T 1335 in China are advisory body-measurement frameworks, not laws. So a US 8 at one premium label can be a US 4 at another, and a "medium" from 2015 is often a "small" in last season's cut. The number on the tag is a marketing signal. The only stable input is your own chest, waist, and hip in centimetres.

A worked example: from a tape measure to four systems

Say you measure your bust at 90 cm and your hip at 96 cm, and you want a fitted dress from a UK shop that only lists UK and EU.

Start from a system you trust. You know you wear a women's US 8 at home, so set the input system to US, garment to dress, and type 8.
The converter returns UK 12 and EU 38, and tells you that size is cut for an ~88 cm bust and ~96 cm hip.
Now you compare against your tape: your bust is 90 cm, which is above the 88 cm that the US 8 / UK 12 / EU 38 row is built for. You're sitting between the M and the L.
Because the dress has a fitted bodice, you size up to the L (UK 14 / EU 40). The hip already matches at 96 cm, so the fit risk is all in the chest — and you've just resolved it before paying.

That five-second check is the difference between a keeper and a return slip. The same logic works in reverse: a Chinese listing might show 170/88A (height 170 cm / 88 cm chest, "A" body type), and you match the 88 directly against your own number instead of trusting the seller's "M."

Buying clothes from another region

Cross-border shopping is where size confusion costs real money, because returns mean international postage and a long refund wait. A few habits that work:

Convert into the seller's system first, then sanity-check the cm. If a Taobao or ASOS listing is in EU or Chinese GB/T, translate your home size into that system, then confirm the body-measurement range matches your tape. The conversion gets you to the right row; the centimetres confirm you belong in it.
Briefing a daigou agent? Send the body number, not just the letter. "I'm a 102 cm chest, the listing's L is 96A, please size up" is unambiguous. "I'm an L" is not.
Distrust vintage and thrifted tags entirely. European sizing ran smaller decades ago. Measure the garment flat across the chest, double it, and compare to the body columns. A jacket tagged EU 48 that actually measures 88 cm around will fit like a modern S, not the M the tag implies.
If you sell, publish a cm chart. A US/UK/EU/CN table with chest or waist in centimetres lets buyers in five regions self-select correctly, which is the single biggest lever on apparel return rates. Run each real garment measurement through the converter and paste the result straight into your listing.

For the inch-to-cm conversions that crop up in spec sheets and brand size guides, a general unit converter handles the stray numbers the size chart doesn't cover.

How to measure yourself once and reuse it forever

Spend five minutes with a soft tape and you'll never guess a size again.

Chest / bust: around the fullest part, tape under the armpits and across the shoulder blades, level all the way round.
Waist: at the narrowest point of your torso, usually just above the navel. Don't suck in — you want the number you live at.
Hip: around the widest part of your seat and hips.

Write the three numbers down in centimetres and keep them in a note on your phone. From then on, every size chart in every system becomes a simple lookup: find the row whose body measurement matches yours, and read off whatever letter or number that brand happens to use. The label changes; your 90 cm bust does not.

That's the whole trick. Stop converting between letters and start converting to your own body. The systems will keep disagreeing — US to UK to EU to CN, brand to brand, decade to decade — but a measured chest and waist in centimetres is the one input that holds steady across all of them.

Made by Toolora · Updated 2026-06-13