US, UK, EU, Japan Clothing Sizes: How to Convert Without Guessing

A US women's 8 is roughly a UK 12, a EU/continental 38–40, and a Japanese 11 — but conversions are a starting point, not a guarantee, because each country grades its sizes against different base body measurements. As of January 2026 there is still no binding international standard: every chart below reflects the most widely used national conventions, checked against national measurement bodies' guidance in January 2026. Measure yourself once with a tape and the tables do the rest.

This is consumer information, not tailoring advice; when a garment must fit perfectly, the brand's own measurement chart beats any generic table.

How do women's sizes convert between the US, UK, and Europe?

The patterns are simple once you know them: UK sizes run 4 above US sizes, and EU sizes run roughly 30–32 above US sizes for women's clothing. Japan uses its own odd-numbered system that sits below all of them.

Three national quirks matter: Italian sizes run two numbers above German/EU for the same body, French sizes run two below Italian, and Japanese cuts run smaller overall — a Japanese 9 is cut for a shorter torso and narrower shoulder than a US 6, so tall shoppers should size up beyond what the number suggests.

What about men's clothing?

Men's shirts and jackets are easier because most of the world already uses chest measurements. US and UK suit and jacket sizes are identical (a 40R is a 40R in both). EU sizes run 10 above US for suits and jackets, so a US 40 becomes an EU 50. Japan cuts roughly one size smaller across the board — most travelers from the US take one size up in Japanese brands. Trousers: US and UK use inches of waist (32, 34, 36), EU brands increasingly do the same, and Japanese brands often use centimeters, so a "76" trouser is a 30-inch waist, not a 76-inch anything.

Why do shoes follow yet another chart?

Women's shoes: US 8 = UK 6 = EU 39 = JP 25 (centimeters). Men's: US 9 = UK 8 = EU 42–43 = JP 27. Two warnings from the fitting bench: UK and Australian women's sizing is the same, but US and Australian are not — one size apart. And EU shoe sizes are only semi-standardized; a 39 from one Italian maker fits like a 39.5 from another. If you can, have both feet measured in centimeters (the Japanese system's unit) and shop from that number everywhere.

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What do "oversized" and "slim" labels hide?

Vanity grading is real: a US 8 today is cut larger than a US 8 from the 1990s, and fast-fashion brands grade differently from tailoring houses even within the same country. Cut descriptors also shift the target — a European "slim fit" shirt is typically one to two inches tighter in the chest than the brand's regular fit, and Japanese "relaxed" often equals an American regular. When a chart and a cut label disagree, trust the actual measurements in centimeters.

What about dress shirts?

Dress shirts use three different conventions. US casual shirts mostly use the S/M/L scale; UK and European formal shirts use collar measurements in inches or centimeters — a 15.5-inch collar in the UK is the same neck in a EU 39 shirt (39 centimeters). Japan uses its own S/M/L but graded smaller, so take a size up or read the centimeter collar figure on the label. Sleeve length is where formal shirts betray a bad conversion: measure from the center back of your neck, over the shoulder, to the wrist, and match that number in either inches or centimeters before you buy.

Do kids' sizes convert at all?

Poorly. US children's clothing uses age-plus-months labels graded large, European brands label by height in centimeters (a EU 116 fits a child about 116 centimeters tall), and Japanese labels use height too — making the EU and Japanese height-based charts the only genuinely reliable ones for cross-border buying. If you're shopping children's clothes abroad, ignore the age on the label entirely and shop by the child's height. It is the one corner of sizing where the metric systems have already won.

How should you actually buy clothes abroad?

1. Measure once: chest or bust, waist, hip, inseam, in centimeters. Write them in your phone.
2. Convert to the target country's system with the tables above.
3. Check the brand's own size chart — large makers publish garment measurements, not body measurements, which is a different number.
4. When between sizes, remember regional cut bias: Japanese smaller, Italian slimmer, US larger.
5. Keep the receipt; many countries' consumer return rights (statutory, not customs) still apply even to sale items in some markets — check the store's posted policy at purchase.

The reliable shortcut

Numbers lie between countries; centimeters don't. A shopper who knows three measurements — chest, waist, hip — can buy correctly in Tokyo, Milan, or Minneapolis without memorizing a single conversion. The charts above handle the moment you don't have the tape; the tape handles every other moment.