Japan to US Men's Shoe Size Conversion
| Japan (cm) | US |
|---|---|
| 25 | 7 |
| 25.5 | 7.5 |
| 26 | 8 |
| 26.5 | 8.5 |
| 27 | 9 |
| 27.5 | 9.5 |
| 28 | 10 |
| 28.5 | 10.5 |
| 29 | 11 |
| 29.5 | 11.5 |
| 30 | 12 |
Sizing conventions vary by brand and by cut — this table shows the standard published conversion. Always check the garment's own size chart when one is available. See how these tables are compiled.
A Mondopoint-style length meeting an American number line
Japan builds its men's shoe sizes around the literal length of the last in centimetres, so a JP 27 is cut for a 27cm foot rather than climbing an arbitrary scale the way American sizing does — going from JP to US means running that centimetre figure through an inch conversion and then rounding to whichever half size a specific American brand happens to stock, and because US brands don't calibrate that rounding identically, the same JP 27 can land on a US 9 at one label and a US 8.5 at another.
Mainstream American dress-shoe lasts, built for a broader Western business-shoe market, tend to carry more volume through the forefoot than the domestic Japanese proportions a lot of Japanese dress-shoe brands still design around — the practical result is a shoe that measures correctly at the toe but sits with noticeably more room across the ball of the foot than a Japanese wearer converting for the first time would expect.
Wide Japanese business-shoe grades have no US letter to land on
Japan's long tradition of formal office footwear produced width grades that go well past what American dress shoes typically offer — EEE and sometimes wider — while mainstream US dress shoes rarely go past EE. Someone whose Japanese size includes one of these wider grades is better off sizing up in length on the American side than hunting for a US width letter that simply doesn't exist at that end of the scale.
Grey-market and traveller purchases skip the conversion table entirely
A Japanese-market dress shoe picked up on a work trip, or bought through an import reseller, often ships with nothing but the JP centimetre figure stamped in the shoe — no US size printed anywhere, because the item was never meant for American retail. In that case there's no table to consult at all; converting the centimetre length to inches yourself and checking it against the specific US brand you're comparing against is the only route available.
Treat the JP figure as the real measurement
Treat the JP number as the real measurement it is, convert the length rather than trusting a size-for-size lookup, and if your usual Japanese fitting runs to EEE or beyond, plan on a longer American shoe rather than searching for a matching width letter that mainstream US dress-shoe brands don't stock.
Frequently asked questions
Does a JP 27 always land on the same US number?
No — different American brands round their half sizes against actual foot length slightly differently, so the same JP 27 can convert to a US 9 on one brand's chart and a US 8.5 on another.
Why does an American dress shoe feel roomier than a Japanese one at the same converted length?
Mainstream US dress-shoe lasts are generally built with more forefoot volume for a broader Western business-shoe market than the domestic Japanese proportions many Japanese labels still design around.
What do I do if my Japanese size includes a EEE width grade?
Look for extra length rather than a matching width letter — mainstream American dress shoes rarely go past EE, so a wider Japanese grade doesn't have a direct US equivalent to request.
I bought a Japanese business shoe abroad and it has no US size at all — now what?
That's typical of domestic Japanese stock never intended for American retail. Convert the stamped centimetre length to inches yourself and check it against the specific US brand you're sizing against.
Is guessing my US size from memory reliable for a Japanese import?
Not as reliable as working from the actual centimetre figure on the shoe — Japanese sizing already tells you the true length, so there's no reason to go through an estimated US number first.