American Shoe Size to Japanese Calculator
Convert a US shoe size to the equivalent Japanese (JP / cm) shoe size.
Japanese sizing is based on foot length in centimeters, so results are shown as the nearest standard JP size.
How the Conversion Works
Japanese shoe sizes are labeled directly by foot length in centimeters, unlike the US system, which uses a numbered scale.
To estimate the Japanese equivalent, this calculator applies the standard offsets observed across published international size charts:
Men’s US size + 17.5 = Japanese size (cm)
Women’s US size + 16 = Japanese size (cm)
The result is then rounded to the nearest half size, since Japanese sizes are typically sold in 0.5 cm increments.
Fit can vary by brand and last shape, so treat the result as a close estimate rather than an exact measurement. Measuring actual foot length in centimeters gives the most accurate Japanese size.
A Japan shoe size conversion chart turns foot length in centimeters into a US, EU, or UK size. This guide covers every common shoe size conversion Japan US shoppers search for, plus manufacturing notes from footwear production.
This guide draws on footwear pattern-making and manufacturing practice used across Japanese and US shoe brands. Japan shoe size compared to US size looks different at first glance, since Japan uses a plain centimeter scale instead of a separate number system.
Table of Contents
What Is the Japan Shoe Size System
Japan uses a simple system. Shoe sizes in Japan show the foot length in centimeters. A size 24 means the foot measures 24 centimeters. This system differs from the US, UK, and EU systems, which use separate number scales.
Japan shoe size cm values make the system easy to measure at home. A ruler and a flat wall give an exact foot length. Japan’s footwear industry follows a national sizing standard known as JIS. JIS sets foot length and width rules for shoe factories, and this standard keeps the cm-based system consistent across Japanese brands.
Japan Shoe Size Conversion Chart (Men, Women, EU, UK)
The table below works as a japan shoe size conversion chart for men, women, and other regions. Foot length in centimeters is the base value. Other columns are close estimates, since brand fit can shift a size up or down.
| Japan (cm) | US Men | US Women | UK | EU |
|---|---|---|---|---|
| 22.0 | 4 | 5.5 | 3.5 | 36 |
| 22.5 | 4.5 | 6 | 4 | 36.5 |
| 23.0 | 5 | 6.5 | 4.5 | 37 |
| 23.5 | 5.5 | 7 | 5 | 37.5 |
| 24.0 | 6 | 7.5 | 5.5 | 38 |
| 24.5 | 6.5 | 8 | 6 | 38.5 |
| 25.0 | 7 | 8.5 | 6.5 | 39 |
| 25.5 | 7.5 | 9 | 7 | 39.5 |
| 26.0 | 8 | 9.5 | 7.5 | 40 |
| 26.5 | 8.5 | 10 | 8 | 40.5 |
| 27.0 | 9 | 10.5 | 8.5 | 41 |
| 27.5 | 9.5 | 11 | 9 | 41.5 |
| 28.0 | 10 | 11.5 | 9.5 | 42 |
| 28.5 | 10.5 | 12 | 10 | 42.5 |
| 29.0 | 11 | 12.5 | 10.5 | 43 |
| 29.5 | 11.5 | 13 | 11 | 43.5 |
| 30.0 | 12 | 13.5 | 11.5 | 44 |
A japan shoe conversion chart like this one works for sneakers, boots, and dress shoes alike. Save this shoe size conversion chart Japan page for future orders. This shoe size conversion chart Japan US buyers use most often starts with a simple foot measurement. A japanese shoe conversion chart from a specific brand gives the closest match for narrow or wide feet.
How to Convert Japan Shoe Size to US Size
The conversion follows one rule. Subtract 18 from the Japan cm size to get the US men’s size. A 27 cm Japan size becomes a US men’s size 9. Add 1.5 to the US men’s number to get the US women’s size.
This method works to convert Japan shoe size to US size fast. The chart above confirms the result. Shoe size in Japan conversion stays consistent across most sneaker and dress shoe brands.
Steps to convert a Japan shoe size to US:
- Measure the foot length in centimeters.
- Round the number to the nearest 0.5 cm.
- Match the cm value to the chart above.
- Pick the men’s or women’s column.
How to Convert US Shoe Size to Japan Size
The reverse process uses one formula. Add 18 to the US men’s shoe size to get the Japan cm value. A US men’s size 9 becomes a Japan size 27 cm. This step helps convert shoe size US to Japan before an online order.
Shoppers ask this question often as us to japan shoe size conversion or us shoe size to japan shoe size conversion. Both phrases point to the same formula above. The shoe size conversion chart US to Japan removes extra math for common sizes.
An us 9 shoe size in Japan and a shoe size us 9 to Japan question both point to the same 27 cm answer. Japanese brands often print this value directly on the box as “270.”
Japan Shoe Size in Centimeters: Key Examples
23.5 Japanese Shoe Size to US
A 23.5 Japanese shoe size to US equals a men’s size 5.5 or a women’s size 7. This size fits a foot near 23.5 cm long.
24.5 Japan Shoe Size to US
A 24.5 Japan shoe size to US equals a men’s size 6.5 or a women’s size 8. The gap between men’s and women’s numbers stays at 1.5 across the whole chart.
Japan Size 23 to US and Size 24 Japan to US
A Japan size 23 to US equals a men’s size 5 or a women’s size 6.5. A size 24 Japan to US equals a men’s size 6 or a women’s size 7.5.
Japan 28.5 Shoe Size
A Japan 28.5 shoe size equals a men’s US size 10.5 or a women’s US size 12. This size also matches EU size 42.5. A wide-width option helps a foot this size keep a full toe box.
Common Shoe Sizes in Japan: 36 to 44
The numbers below use the EU scale, since many imported labels show this number range. Each EU number links to its Japan cm match.
36 Shoe Size in Japan
A 36 shoe size in Japan equals about 22 cm. This size matches a US women’s size 5.5.
37 Shoe Size in Japan
A 37 shoe size in Japan equals about 23 cm. Shoe size 37 in Japan matches a US men’s size 5 or a US women’s size 6.5.
38 Shoe Size in Japan
A 38 shoe size in Japan equals about 24 cm. Shoe size 38 in Japan matches a US men’s size 6 or a US women’s size 7.5.
39 Shoe Size in Japan
A 39 shoe size in Japan equals about 25 cm. Shoe size 39 in Japan matches a US men’s size 7 or a US women’s size 8.5.
40 Shoe Size in Japan
A 40 shoe size in Japan equals about 26 cm. This size matches a US men’s size 8 or a US women’s size 9.5.
41 Shoe Size in Japan
A 41 shoe size in Japan equals about 27 cm. This size matches a US men’s size 9 or a US women’s size 10.5.
42 Shoe Size in Japan
A 42 shoe size in Japan equals about 28 cm. Shoe size 42 in Japan matches a US men’s size 10 or a US women’s size 11.5.
43 Shoe Size in Japan
A 43 shoe size in Japan equals about 29 cm. This size matches a US men’s size 11 or a US women’s size 12.5.
44 Shoe Size in Japan
A 44 shoe size in Japan equals about 30 cm. This size matches a US men’s size 12 or a US women’s size 13.5.
Half Sizes Conversion from 6.5 to 9.5 in Japan
6.5, 7, and 7.5 Shoe Size in Japan
A 6.5 shoe size in Japan equals 24.5 cm for men or 23 cm for women. A shoe size 7 in Japan equals 25 cm for men or 23.5 cm for women. A 7.5 shoe size in Japan equals 25.5 cm for men or 24 cm for women. Some labels print this size as 7 1 2 shoe size in Japan instead of 7.5.
8.5, 9, and 9.5 Shoe Size in Japan
An 8.5 shoe size in Japan equals 26.5 cm for men or 25 cm for women. A shoe size 9 in Japan equals 27 cm for men or 25.5 cm for women. A 9.5 shoe size in Japan equals 27.5 cm for men or 26 cm for women, and a few charts list this as 9 1 2 shoe size in Japan.
Women’s Shoe Size Conversion Japan
Japan women’s shoe size to US follows the same cm-based chart. A women’s shoe size conversion Japan match starts with the foot length in centimeters, then applies the men’s-plus-1.5 rule.
Women’s Shoe Size 8 in Japan
A women’s shoe size 8 in Japan equals 24.5 cm. This size also matches a men’s US size 6.5 and an EU size 38.5.
EU and UK Shoe Size to Japan Conversion
Shoe size EU to Japan conversion and shoe size Euro to Japan conversion both use the chart above. An eur37 to Japan shoe size equals 23 cm. Shoes size Europe to Japan conversion shifts by about 14 points, since EU numbers run higher than the plain cm value.
UK sizes shift the least from the cm value. A UK size sits about 0.5 lower than the matching US men’s number.
A Footwear Engineer’s View on Japan Shoe Sizing
Footwear factories build shoes around a last, not around a printed number. A last is the solid form that shapes the upper and the sole. Japanese lasts often carry a narrower heel and a standard width grade, while US lasts vary more between brands.
Textile choice changes the fit too. A knit or canvas upper stretches more than a leather upper. A factory adds extra room to a textile shoe pattern to control this stretch over time. This step keeps a size 25 cm shoe close to 25 cm after repeated wear.
Quality control teams measure finished shoes against the JIS scale before shipping. This check keeps the cm number accurate at the factory level, not just on the size chart.
Upcoming Trends in Footwear Sizing
Brands now use 3D foot scanning in stores and apps. A scan captures foot length, width, and arch shape in seconds. This data feeds size charts that match a real foot more closely than a printed number alone.
Sustainable materials also change fit testing. Recycled knit uppers stretch differently than virgin fiber blends, so factories run new fit trials for each material batch. Made-to-order lasts, once limited to custom shoemakers, now appear in small-batch sneaker production too.
Frequently Asked Questions
Is Japan Shoe Size the Same as EU Size?
No. Japan shoe size uses plain centimeters. EU size uses a separate scale that sits about 14 points higher than the matching cm value.
Does Japan Use Half Sizes?
Yes. Japanese brands sell shoes in 0.5 cm steps, so a size can read as 24.0, 24.5, or 25.0.
How Accurate Is a Japan Shoe Size Conversion Chart?
A chart gives a close estimate. Brand last shape and shoe width still change the final fit, so a width check adds extra accuracy.
What Is the Fastest Way to Convert Shoe Size US to Japan?
Add 18 to the US men’s number to get the Japan cm size. Subtract 1.5 from the US women’s number first, then add 18.
A Japan shoe size conversion chart turns a confusing number into one clear centimeter value. The formulas above cover men’s, women’s, EU, and UK sizes in one place. A quick foot measurement, paired with this chart, picks the right size on the first order. The calculator above runs these same steps in seconds.
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