A men's US 10 is not a European 44 in every brand, and that single mismatch drives more returns for small shops than almost any other mistake. A mens shoe size converter lines up US, UK, EU, and CM figures so you can quote, list, and ship the right pair the first time. What follows covers the scales that matter for Nike, Jordan, and Adidas Stock, how to run a conversion in under a minute, and the places where charts quietly fail.
Retailers with purely domestic inventory memorize two or three conversions and move on. That shortcut collapses the moment you buy from a European distributor or quote a US buyer on a pair tagged EU 43 1/3. A chart is a starting point. The judgment stays with you.
The Four Scales Printed on Most Cartons
Footwear boxes usually carry four numbers: US men's, UK, EU, and CM, the last sometimes printed as JP or Mondo. Moving between them is simple arithmetic once you know which scale you are reading.
US and UK men's sizes sit one full size apart, so a US 10 matches a UK 9, and that gap flips when you cross into youth sizing. EU numbers climb in steps of roughly 1.5 and track last length rather than foot length, which is why they never divide evenly. CM is the most honest of the four because it describes the foot itself.
Men's Size Cross-Reference
The table below is a working reference for adult men's footwear. Expect small disagreements between brands, and confirm anything you print on a listing against the manufacturer's own chart. All figures are approximate; verify with your supplier before you commit to a size run.
| US Men's | UK | EU | Foot Length (CM) | Typical JP Label |
|---|---|---|---|---|
| 8 | 7 | 41 | 25.5–26.0 | 26 |
| 9 | 8 | 42.5 | 26.5–27.0 | 27 |
| 10 | 9 | 44 | 27.5–28.0 | 28 |
| 11 | 10 | 45 | 28.5–29.0 | 29 |
| 12 | 11 | 46 | 29.5–30.0 | 30 |
Start with the CM column and work outward. If a customer measures 27.5 cm, the US 10 to EU 44 line is your anchor, and the brand chart decides whether that pair lands as a comfortable 10 or a snug one.
Running a Conversion in Under a Minute
Measurement beats guesswork every time, and it costs about two minutes of floor time. Anyone on staff can run a mens shoe size converter in under a minute once the steps are written down and posted.
- Measure the foot heel to longest toe, standing, late in the day, both feet, in centimeters.
- Take the longer foot and find that CM value on the chart.
- Cross-check the US result against the brand's published sizing for that exact model.
- Adjust for width, sock thickness, and whether the buyer wears insoles.
- Write the result on the listing or invoice, for example: measures 27.5 cm, fits like US 10 in this model.
Keep a Brannock device or a printed CM scale near the register and use it for returns as well as sales. When a pair comes back, measure the insole and log the model with the customer's stated size. After thirty or forty entries you have a store-specific reference that beats any generic table.
Where Charts Quietly Fail
Nike, Adidas, and Jordan each build around their own lasts, and a last is a shape, not a number. The same EU 44 on an Adidas box and a Nike box does not guarantee the same fit. Jordan retros follow Nike sizing on paper, yet buyer feedback on individual models can drift by half a size.
Half sizes are where the arithmetic breaks down. Nike sells US half steps; Adidas often uses EU thirds like 42 2/3 and 43 1/3, which have no clean US equivalent. Width makes it worse, because US widths (D, E, EE) have no EU counterpart, so a wide-footed buyer converting from an EU label gets no width signal at all.
Youth and women's scales add another trap. A women's US 10.5 sits close to a men's US 9, and kids' UK sizes stop lining up with adult UK sizes at the top of the range. On unisex or youth stock, read the box label rather than the listing title.
Treat a mens shoe size converter as a first pass and the brand chart as the final word. That order keeps return rates down and keeps customer conversations short.
Stocking Decisions That Depend on Size Accuracy
Size accuracy is a purchasing problem before it is a customer service problem. Approving a bulk order means committing to a size distribution, and a bad conversion at that stage strands inventory you cannot move at full price.
Ask each supplier for the size breakdown per carton in writing before you sign off, and confirm which scale the cartons are labeled in. Mixed cases are common in closeout and liquidation lots, and a case listed as a "size run" may skip the middle sizes that sell fastest. Ratio and minimums vary widely by supplier, so confirm both rather than assuming.
- Request the exact size run and per-carton breakdown in writing.
- Confirm whether cartons are labeled US, UK, EU, or CM only.
- Ask which size chart the factory used for that model.
- Measure a sample pair's insole and compare it to the tagged size.
- Record the chart source and the date for every SKU you list.
Relabeling carries its own risk. Consumer labeling rules and customs paperwork differ by market, so check with your broker or compliance contact before you add or replace size stickers on imported stock. Having a mens shoe size converter pinned at the packing table helps, but the real control is the written size run on the purchase order.
Questions Buyers Ask Most
Is a mens shoe size converter accurate across brands?
Only for the scales themselves. The US-to-EU math stays consistent, but lasts, width, and upper materials do not. Nike, Adidas, and Jordan each publish their own charts, and those override any generic table you find online. Use a converter to narrow the range, then confirm on the brand's page before you quote a size to a customer.
Do UK and US men's sizes differ by one full size?
For adult men, usually yes: US 10 corresponds to UK 9. The relation is not universal at the edges, though. Youth sizing, some British work boots, and a handful of European brands label differently. Check the box or the brand chart whenever the size falls below US 7 or above US 13.
Is EU 44 the same as US 10?
Roughly, and the "roughly" is the point. EU 44 usually lands near US 10 with a foot length around 27.5 cm, but the same EU number can feel different from one brand to the next. If your buyer is a steady US 10, order a single sample in EU 44 and measure the insole first.
Why does CM sizing look different from US sizing?
CM, also printed as JP or Mondo, measures foot length in centimeters instead of a step on a numbered scale. That makes it the easiest figure to verify with a ruler. Compare a measured foot to the CM value on the box, allow about 0.5 cm of toe room, then convert the result to US.
What about wide feet?
Conversion charts assume a standard width, so a wide-footed buyer often needs a half size up or a different model entirely. Ask for insole width measurements when a supplier can provide them, and flag wide fits in your listings. A returned pair costs more than a careful sizing note.
Next Step
Send over the size run you are working with, including the labels printed on the cartons, and we will walk it through a mens shoe size converter with you before you place the order. Getting the mapping right at the quote stage is cheaper than fixing it after the pallets land.