Free Clothing Size Converter — US, EU, UK, Japan

Convert clothing sizes between US, EU, UK, and Japan systems for men's and women's tops and pants. Includes body measurement reference in inches and cm.

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What is this calculator for?

You're shopping a Japanese fashion site, and the size chart shows "M" but you're a US Women's 10 in your favorite brand — you don't know if that translates. Or you're buying a European suit from an Italian tailor's online store with sizes like 50, 52, 54 and no idea what fits. The clothing size converter handles US, UK, EU, and Japanese sizing for tops, bottoms, dresses, and suits across men's and women's styles.

Clothing sizing is even less standardized than shoe sizing. US Women's runs in even numbers (0, 2, 4, ... 20+), with vanity sizing meaning the same garment from different brands can be labeled 2 sizes apart. UK Women's runs 1-2 sizes larger than US (UK 12 ≈ US 8). EU Women's runs 24-30 numerical (EU 38 ≈ US 8). Japanese Women's typically uses S/M/L/LL with smaller dimensions than US equivalents (Japanese M is closer to US 4-6). US Men's uses neck × sleeve for dress shirts, S/M/L/XL for casual, and waist × inseam for pants.

This calculator converts between systems but with a strong caveat: brand and style matter as much as system. Always check the brand's specific size chart with actual measurements (chest, waist, hip) before ordering internationally. The standard conversions are starting points, not guarantees.

How to use this calculator

Pick your garment type: tops/dresses, pants, suits, shirts. Each has different conversion rules.

Pick your gender (men's or women's) and known size system. Enter your known size. The calculator returns approximate equivalents in the other major systems.

For best results, take measurements: chest (around fullest part with arms down), waist (at natural narrow point), hip (around fullest part), inseam (inner leg crotch to ankle). Compare measurements to the specific brand's size chart, not the converter's general output. The converter approximates; the brand's chart specifies.

Understanding your results

The calculator returns approximate equivalents in US, UK, EU, and Japanese sizes for your garment type and gender.

Reference Women's conversions: US 4 = UK 8 = EU 34 = JP S/9 (chest ~33", waist ~25", hip ~36"). US 8 = UK 12 = EU 38 = JP M/11 (chest ~36", waist ~28", hip ~38"). US 12 = UK 16 = EU 42 = JP L/13 (chest ~39", waist ~31", hip ~42").

Reference Men's: small ≈ US 36-38 = UK 36-38 = EU 46-48 (chest 38"). Medium ≈ US 40 = UK 40 = EU 50 (chest 40"). Large ≈ US 42-44 = UK 42-44 = EU 52-54 (chest 44"). XL ≈ US 46-48 = UK 46-48 = EU 56-58 (chest 48").

Suits use chest measurement in inches (US/UK) or cm (EU). US 40R = chest 40", standard length = EU 50. Drop number: difference between chest and waist (typically 6 inches for "standard cut," 7-8 for "athletic cut"). Italian suits often labeled in EU only; alterations typically required regardless.

The vanity sizing problem. US Women's sizing has drifted 1-2 sizes smaller over the past 50 years — a "size 8" today is what would have been labeled a "size 12" in 1970s patterns. Different brands also have different proxy: Gap, Banana Republic typically run true to brand chart; J.Crew and Madewell may run small; Old Navy and Target labels often run large. Two "size 8" dresses from different brands can vary 2-3 inches in waist measurement. Always reference brand size charts with actual body measurements; the size number alone tells you almost nothing.

A worked example

Maya is buying a wool coat from an Italian online retailer. Her usual US Women's size in coats is 8. The site lists sizes in IT (Italian numerical, same as EU): 38, 40, 42, 44, 46.

Standard conversion: US 8 = EU 38. She orders 38. The coat arrives — fits well in chest and shoulders but tight in the hip area. She measures her hip (40 inches) against the brand's chart, which lists size 38 as 38" hip and size 40 as 40" hip. She'd actually be a 40 in this brand. Italian brands often size more European-traditionally — narrower hip cut, longer torso. The headline conversion assumed averages; her actual body needed the next size up.

Return cost: $35 international shipping. New coat in size 40 fits well. Lesson: measure body, check brand-specific chart, don't trust the general converter alone.

Variation: Daniel shopping a Japanese men's casual brand. His usual US Men's: chest 40", waist 32". Japanese sizing: S = 36" chest, M = 40", L = 44". He orders Japanese M. The shirt arrives — chest fits at 40" but length is too short (Japanese shirts typically 2-3 inches shorter in body length than US equivalent sizes, designed for shorter Japanese male average height). The "M" was right by chest measurement but wrong by total body proportions. He has to return — exchange shipping costs $42. The lesson he takes: Japanese clothing fits Japanese bodies; US bodies need to either size up for length, choose styles less sensitive to body length, or shop brands with international fit options.

Related resources

For shoe size specifically, see Shoe Size Converter. For ring size, the Ring Size Converter. For general unit conversions, the Unit Converter. Brand-specific size charts are the most reliable references — always check the specific brand's chart before international ordering. Reddit communities (r/femalefashionadvice, r/malefashionadvice) crowdsource brand-specific sizing notes for popular online retailers.

Related calculators

shoe size converterunit converter

Frequently asked questions

Why do clothing sizes vary so much between brands?

Three reasons: (1) Vanity sizing — many US brands have slowly increased the dimensions of each size code over decades, so a modern size 8 may fit like a 1970s size 12. (2) Target market — a brand designed for a younger demographic tends to run tighter. (3) Fit philosophy — Italian and Japanese brands tend to run slim; American athletic brands tend to run looser. Numeric sizes are more stable than letter sizes.

How do I measure myself for clothing?

Use a soft tape measure, wear thin clothing or no top. (1) Chest/bust: across the fullest part, arms relaxed. (2) Waist: at the natural waist (smallest point above the hips, often around the belly button). (3) Hip: across the fullest part of the seat, feet together. Keep the tape level and snug but not tight. Compare to brand size charts, not generic ones.

What is vanity sizing?

The slow inflation of size labels over time. A women's size 8 in 1970 fit roughly the same body as a modern size 4. Many US brands continue to shift sizes downward to flatter customers. EU sizing has shifted less because each EU size code corresponds to a measurement in centimeters, leaving less room for inflation.

EU vs US sizing explained?

EU women's sizes are roughly US size + 30 to + 32 (a US 6 ≈ EU 36 or 38). EU men's sizes for tops/jackets are roughly US chest in inches × 2 + ~10 (a 40-inch chest ≈ EU 50). For pants, EU often equals waist in centimeters (a 32-inch waist ≈ EU 48). UK women's is roughly US + 4 (a US 6 ≈ UK 10).

How do I buy clothes online from other countries?

Three rules: (1) Convert by measurement, not by size code — most international brands publish chest/waist/hip in centimeters. (2) Read recent reviews specifically about fit. (3) Order one size only when in doubt, then exchange — international returns are expensive and slow. ASOS, Net-a-Porter, and Zara all publish their own conversion charts directly on product pages.

Why is women's clothing sizing so inconsistent across brands?

Vanity sizing. Brands have gradually relabeled the same physical measurements as smaller sizes over decades — a flattering psychological appeal that backfires when you can't trust the number on the tag. A 1970s 'size 12' fits the same body as a 2024 'size 6' from typical fashion brands. Within current era, brands also drift: high-fashion brands sometimes still use 'European cut' (smaller), mass-market brands use 'American cut' (more generous). The only reliable approach: ignore the size number, use body measurements against brand-specific size charts.

How do I measure myself for clothing?

Use a soft measuring tape. Chest/bust: around fullest part with arms down, tape level. Waist: natural narrow point (not where pants sit, but where your torso curves narrowest — usually 1 inch above belly button). Hip: around fullest part, typically 7-9 inches below natural waist. Inseam: inside leg from crotch to ankle bone, while wearing a well-fitting pair of pants or barefoot. Sleeve: from center back of neck across shoulder to wrist, arm slightly bent. Record these in inches AND cm; many international charts use cm. Take measurements over thin underwear, not over bulky clothing.

What's the difference between regular, petite, and tall sizes?

Body proportions, not body weight. Regular: standard length proportions for typical heights (5'4" to 5'9" for women, 5'8" to 6'1" for men). Petite: shorter overall length, shorter inseam, shorter sleeve, scaled for women under 5'4". Tall: longer length, longer inseam, longer sleeve, scaled for women over 5'9" and men over 6'2". Same nominal 'size 8' in petite vs regular differs by 1.5-2 inches in inseam and 1 inch in torso length. Choosing the right proportion category matters more than choosing the right number — wrong category leads to permanently uncomfortable fit regardless of numerical size.

Should I order my regular size or size up when ordering online?

Depends on the brand and item. For brands you've worn before: order your usual size. For new-to-you brands: check size chart against your measurements. For brands known to run small (Asian brands often, Madewell, some boutique European brands): size up 1. For brands known to run large (Old Navy, mass-market): consider sizing down. For items that NEED to fit precisely (dress pants, blazers, fitted dresses): order multiple sizes if return shipping is free, keep the best fit. For items more forgiving on size (sweatshirts, sweaters, loose tops): order true to size.

Is there a universal sizing standard?

No. ISO 8559 attempted to standardize body measurements internationally but adoption has been minimal. The industry doesn't follow a single standard because consumers (especially in fashion) accept and even prefer brand-specific sizing. The closest to universal: body measurement in cm or inches — the chest/waist/hip dimensions are the same in every system. Read brand size charts with your actual measurements; ignore the alphanumeric size label as anything more than a rough first filter. Tech-enabled solutions (Bold Metrics, Fit Predictor, brand-specific AI fit recommenders) are slowly improving the online sizing problem but still imperfect.

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