Why does the same size feel different across brands?

Brands use "vanity sizing" — a US 8 in 1990 had different body measurements than a US 8 in 2020. The tool uses the ISO 8559 standardised measurements, but check each brand's chart for fit.

Which is the most reliable input — region size or body measurements?

Body measurements (cm). Sizes are a shorthand; measurements are the ground truth. When you find your row in the table, copy the bust/waist/hip values and use those when ordering.

Does this cover children?

Not today. Children's sizes vary far more (US 4, age 4, or US 4T?) and need a separate height/age-based system.

How does men's bottom sizing work?

In the US and UK men's pants/jeans are labelled by waist in inches, so a "32" means a 32-inch waist (~81 cm). EU pants sizes are waist in cm with a +16 offset (so EU 48 ≈ 32 US).

What is the JP / Japan size system?

Japan uses a numeric scale roughly equal to UK size + 1 for women's tops (so UK 12 ≈ JP 13). Men's JP sizes typically match UK chest in inches.

Is the converter free?

Yes — free, no signup, runs entirely in your browser.

Clothing Size Converter

Convert clothing sizes across US, UK, EU, IT, FR, and JP — tops and bottoms, men and women.

Written by Golam Rabbani, Founder & Lead Engineer

This interactive tool requires JavaScript. Read the formula and worked example below; you can compute the result by hand.

How to use this clothing size converter

Pick gender (women or men) and garment type (tops or bottoms).
Choose the region your size came from — US, UK, EU, Italy, France, Japan, or letter (S/M/L).
Type the size value (numeric like 8, or letter like M).
Press Convert to see the matching sizes in every region plus the body measurements (bust, waist, hip, chest) for that size band.

About this clothing size converter

Clothing size systems were standardised independently in each country, so a "Medium" in the US, EU, and Japan are three different physical sizes. The clothing size converter uses ISO 8559 (Garment construction and anthropometric surveys) plus cross-referenced retailer charts (M&S, Zara, Uniqlo, Nordstrom) to map between US, UK, EU, IT, FR, JP, and letter sizes for women's and men's tops and bottoms. Each row also lists the underlying body measurements (cm) — the real source of truth when brands disagree.

Worked example: a women's top labelled US 8. Look it up in the women's tops table and you find bust 94 cm, waist 76 cm, hip 100 cm — the corresponding sizes are UK 12, EU 40, IT 44, FR 42, JP 13, and letter M. So a US 8 customer should reach for an EU 40 or a Japanese 13 of the same brand. The tool also handles approximate matches: if you type a size that has no exact row (say a "US 7"), it returns the closest entry and flags it as a closest match, not exact. Brand fit varies — the safest move is to measure yourself and pick the size whose bust/waist/hip is within ±2 cm of your numbers.

FAQ

Why does the same size feel different across brands?: Brands use "vanity sizing" — a US 8 in 1990 had different body measurements than a US 8 in 2020. The tool uses the ISO 8559 standardised measurements, but check each brand's chart for fit.
Which is the most reliable input — region size or body measurements?: Body measurements (cm). Sizes are a shorthand; measurements are the ground truth. When you find your row in the table, copy the bust/waist/hip values and use those when ordering.
Does this cover children?: Not today. Children's sizes vary far more (US 4, age 4, or US 4T?) and need a separate height/age-based system.
How does men's bottom sizing work?: In the US and UK men's pants/jeans are labelled by waist in inches, so a "32" means a 32-inch waist (~81 cm). EU pants sizes are waist in cm with a +16 offset (so EU 48 ≈ 32 US).
What is the JP / Japan size system?: Japan uses a numeric scale roughly equal to UK size + 1 for women's tops (so UK 12 ≈ JP 13). Men's JP sizes typically match UK chest in inches.
Is the converter free?: Yes — free, no signup, runs entirely in your browser.