Shoe Size Conversion Guide: US, UK, EU + Width Sizing Explained
US, UK, and EU men's shoe sizes don't line up on a single scale. A US size 10 is typically a UK 9 and an EU 43 to 44, but the exact match can shift by about half a size depending on the brand and the last it's built on. Use the chart below as a reliable starting point, then confirm with an actual foot measurement before you buy, especially if you're ordering across sizing systems for the first time.
US to UK to EU Size Conversion Chart (Men's)
| US | UK | EU |
|---|---|---|
| 7 | 6 | 40 |
| 7.5 | 6.5 | 40.5 |
| 8 | 7 | 41 |
| 8.5 | 7.5 | 42 |
| 9 | 8 | 42.5 |
| 9.5 | 8.5 | 43 |
| 10 | 9 | 43.5–44 |
| 10.5 | 9.5 | 44 |
| 11 | 10 | 44.5–45 |
| 11.5 | 10.5 | 45 |
| 12 | 11 | 46 |
| 13 | 12 | 47 |
Use this as a rule of thumb, not a guarantee. Two shoes labeled the same US size from two different brands can differ by close to a full size, because "size 10" is measured against each brand's own last, not a single universal standard. If you're buying a style for the first time, checking your actual foot length against a brand's specific size chart beats relying on the conversion alone.
Why the Size on the Box Isn't the Whole Story
A size number only tells you the length the shoe was built for; it says nothing about volume across the top of your foot or width at the ball, which is where most fit complaints come from. Two people who both wear a US 10 can need completely different shoes if one has a narrow, low-volume foot and the other has a wide forefoot. That's what width sizing exists to solve, and it's a separate measurement from length entirely.
If you've never measured your feet against a size chart rather than going by memory, our step-by-step guide to measuring at home takes about ten minutes and is worth doing before any size-conversion purchase, especially online.
What D, EE, and EEE Widths Actually Mean
Width sizing runs on its own scale, separate from length:
- D — Standard width. The default width most off-the-shelf dress shoes use. Comfortable for the majority of feet.
- EE — Extra wide. Noticeably wider across the ball of the foot than standard D, built for feet that feel pinched or leave a red mark across the widest part after a normal day in D-width shoes.
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EEE — Triple wide. The widest option, meaningfully roomier than EE and noticeably wider than D for feet that need real space across the forefoot without sizing up in length just to get it.
Most standard retail shoes only come in D. If you've measured and consistently land in EE or EEE, made-to-order is usually the more reliable route than sizing up a half-size in standard width and hoping the extra length compensates for a lack of width; it usually doesn't, and it just adds heel slip instead. 
Our wide-feet buyer's guide walks through how to tell which width you actually need, and HolloShoe's made-to-order Bespoke collection builds to D, EE, or EEE specifically. Lacing style matters here too. Derbies generally give wide feet more room than Oxfords even before you factor in width sizing, since the open-laced construction itself adjusts more.
FAQ
Are men's shoe sizes the same in every country?
No. The US, UK, and EU each use a different sizing scale, and the same numeric size can mean a slightly different actual length depending on the system. Use a conversion chart as a starting point, and check the brand's specific size guide when you can.
What is US size 10 in UK sizes?
A US men's size 10 is typically a UK size 9 and roughly an EU 43.5 to 44, though this shifts slightly by brand.
How do I know if I need a wide shoe?
If your feet regularly feel pinched across the widest part after a few hours in standard-width (D) shoes, or you see a visible red line across the top of your foot at the end of the day, that's usually a sign you need EE or EEE width rather than a longer standard shoe.
Do all shoe brands size the same?
No. Sizing varies by brand because each brand builds on its own last (the foot-shaped mold shoes are built around). The same labeled size can fit differently between two brands, which is why measuring your actual foot is more reliable than assuming your size carries over.