Clothing Size Calculator & Converter (Women's & Men's / Japan, US, UK, EU)
Free calculator to convert women's and men's clothing sizes between Japan (号/size number, S/M/L), US, UK, and EU. You can also search by measured bust, chest, waist, or hip in cm. Handy for choosing the right size on overseas shopping sites.
Women's size chart
| Japan (号/size number, S/M/L) | US | UK | EU | Bust (measured) | Waist (measured) | Hip (measured) |
|---|---|---|---|---|---|---|
| XS（5号） | 2 | 6 | 32 | 77 cm | 58 cm | 86 cm |
| S（7号） | 4 | 8 | 34 | 80 cm | 61 cm | 89 cm |
| M（9号） | 6 | 10 | 36 | 83 cm | 64 cm | 92 cm |
| L（11号） | 8 | 12 | 38 | 86 cm | 67 cm | 95 cm |
| LL（13号） | 10 | 14 | 40 | 89 cm | 70 cm | 98 cm |
| 3L（15号） | 12 | 16 | 42 | 92 cm | 73 cm | 101 cm |
| 4L（17号） | 14 | 18 | 44 | 95 cm | 76 cm | 104 cm |
Men's size chart
| Japan (号/size number, S/M/L) | US | UK | EU | Chest (measured) | Waist (measured) |
|---|---|---|---|---|---|
| S | 34 | 34 | 44 | 88 cm | 74 cm |
| M | 38 | 38 | 48 | 96 cm | 82 cm |
| L | 42 | 42 | 52 | 104 cm | 90 cm |
| LL | 46 | 46 | 56 | 112 cm | 98 cm |
| 3L | 50 | 50 | 60 | 120 cm | 106 cm |
| 4L | 54 | 54 | 64 | 128 cm | 114 cm |
The chart above is a general guideline. Actual fit can vary by brand and cut (silhouette). We recommend also checking the size chart on the product page whenever possible.
What is clothing size conversion? Understanding Japan, US, UK, and EU sizes
Clothing size labels have developed along completely different lines from country to country. Japan uses its own size numbers (号) for women and letter sizes (S/M/L), the US has its own numbering, the UK has its own, and continental Europe uses EU sizes — so the same label, such as "M" or "38," can mean very different actual measurements depending on which country's system it comes from. Because there is no single international standard, assuming that a similar-looking number will fit is a common way to end up with the wrong size when buying from an overseas brand.
This tool converts between Japan (size number/S-M-L), US, UK, and EU labels using separate charts for women's and men's clothing. You can also search by a measured bust, chest, waist, or hip value in cm, so even if you don't know the size number or letter of a garment, a tape measure is enough to get a reasonable estimate. Keep in mind that the chart is only a general guideline — actual fit still varies by brand and cut.
How to use the clothing size converter
- Choose a gender Select women's or men's first, since the same letter size (e.g. M) is based on completely different measurements for each.
- Choose the system you already know Pick whichever of Japan (size number/S-M-L), US, UK, EU, or a measured bust/chest/waist/hip value in cm matches what's printed on the product page you're looking at.
- Enter the size or measurement Discrete values (size number, S/M/L, US/UK/EU) are chosen from a dropdown, while measured cm values are typed into the number field using your own tape-measure reading.
- Check the converted result All four labels (Japan, US, UK, EU) plus the corresponding bust/chest, waist, and hip measurements appear at once for the value you entered.
- Compare neighboring sizes in the chart If your measurement falls near a size boundary, scroll down to the women's or men's chart and compare the size one step up and down as well.
Tips for getting more out of it
- When shopping on an overseas brand's website, checking the measured bust/waist/hip values in cm (if listed) alongside the US/UK size number reduces the chance of a poor fit.
- Japanese women's sizes (号) increase in steps of 5, with bust increasing by roughly 3 cm for every 2-step increase in size number. If you know the 号 number of clothes that already fit you, you can estimate your size without measuring.
- Men's letter sizes (S/M/L/LL/3L) are based on measured chest and waist in cm. Since brands differ in cut (slim fit vs. relaxed fit), treat this as an initial guideline only.
- The same letter size (e.g. M) corresponds to completely different measurements for women and men. Double-check the gender selection when shopping for matching couple outfits or unisex items.
When this tool comes in handy
Shopping on an overseas retail site
Brands like ASOS or Zara often list only US or EU sizes. Enter the Japanese size you normally wear to check the equivalent US/EU label in advance and avoid a costly return.
Buying in person while abroad
If a shop during a trip or study abroad only labels sizes in the local system, converting your usual Japanese size ahead of time lets you communicate the right size to a store clerk without trying anything on.
Choosing a gift for someone overseas
When buying clothing as a gift for family or friends living abroad, asking for their measured bust or waist in cm lets you pick the right size whether you order from Japan or buy it locally.
Checking a brand's own size guide
Before comparing your measurements against a US- or EU-based size guide on an overseas brand's website, convert your own size first so you can line the two up immediately.
Working out measurements from a size you already own
If you know the size number or letter of clothes already in your closet but not the exact bust or waist measurement, this tool can also work backward from the size to an approximate cm value.
Glossary
- Bust
- The measurement around the fullest part of a woman's chest, in cm. It's the most fundamental basis for determining a women's size number or letter size.
- Chest
- The men's equivalent of bust — the measurement around the chest in cm. Jacket and shirt sizes are usually designed around this figure.
- Vanity sizing
- The practice of labeling a garment with a smaller nominal size than its actual measurements would suggest, so shoppers feel they fit into a smaller size. It is a major reason the same label (e.g. US 8) can vary by several centimeters between brands.
- Size chart
- A table published by a brand or manufacturer that maps its size labels to actual measurements (bust, waist, hip, etc.). Because the same label can mean different measurements at different brands, checking the chart before buying reduces the risk of a poor fit.
- Size number (号)
- The size label used for women's clothing in Japan, based on body-type classifications defined by the JIS (Japanese Industrial Standards). It increases in steps of 5, with a standardized combination of bust, waist, and hip at each step.
- Ease
- The extra room built into a garment beyond the exact body measurement, expressed in cm. Even at the same labeled size, the amount of ease differs by cut (slim fit vs. relaxed fit), which changes how the garment feels when worn.
- Hip
- The measurement around the fullest part of the hips, in cm. It's one of the bases used for women's bottoms and dresses, and is not included in this tool's men's chart.
Frequently Asked Questions
Side Note — How did 号, S/M/L, and US/UK/EU sizes come to be?
Japan's clothing size number (号) traces back to body-type classifications defined by the JIS (Japanese Industrial Standards). Women's sizes increase in steps of 5, each with a standardized combination of bust, waist, and hip, making the system easy to reason about once you know the number. It is said to have originally been designed based on body-measurement survey data of Japanese people from the 1970s.
US and UK clothing sizes, on the other hand, have been standardized independently by different industry bodies over time, leading to a well-known phenomenon called "vanity sizing" — the same nominal size (e.g. US 8) can correspond to measurements that differ by several centimeters between brands. One factor behind this is that brands have intentionally loosened their standards to give consumers the impression they can fit into a smaller size.
EU sizes are a numeric system widely used across continental Europe, and in many countries the number is close to the actual bust or chest measurement in cm. The ISO (International Organization for Standardization) continues to discuss international standardization of clothing sizes, but the traditional size-number and letter-size conventions remain deeply entrenched among consumers in each country and are still widely used today.