UK 8.5 to US shoe size
A UK 8.5 shoe is a US men's 9 or a women's 10.5, which is a foot length of 26.7 cm.
UK 8.5 in every system
| US Men | US Women | UK | EU | Foot (cm) |
|---|---|---|---|---|
| 9 | 10.5 | 8.5 | 42.5 | 26.7 |
UK sizes near 8.5
| UK | US Men | US Women | Foot (cm) |
|---|---|---|---|
| 7.5 | 8 | 9.5 | 25.8 |
| 8 | 8.5 | 10 | 26.2 |
| 8.5 | 9 | 10.5 | 26.7 |
| 9 | 9.5 | 11 | 27.1 |
| 9.5 | 10 | 11.5 | 27.5 |
The reverse conversion
Going the other way, US men's 9 or women's 10.5 comes back to UK 8.5, the same shoe with a different label on the box. See US women's 10.5 to UK for that direction in full.
Why the numbers differ
Every size on this page describes the same physical foot length, 26.7 cm. Europe measures in Paris points, where one size is two thirds of a centimetre, which is why EU numbers climb faster than UK and US numbers. The UK and the US both use the barleycorn system, a third of an inch per size, but they start counting from different points, and the US then splits again into separate men's and women's scales about 1.5 sizes apart. None of that changes the shoe, only the number printed inside it.
Brands still cut a given size generously or tightly, so treat the converted number as the starting point and the 26.7 cm foot length as the check. If a retailer publishes an internal length or an insole length, compare that to your own measurement rather than trusting the size label alone. To measure properly, see how to measure shoe size. For every other size in this direction, see the full UK to US shoe size chart.
Common questions
What is UK 8.5 in US shoe size?
A UK 8.5 shoe is a US men's 9 or a women's 10.5, which is a foot length of 26.7 cm.
Does UK 8.5 differ for men and women?
No. UK uses one number for both, so UK 8.5 is the same length either way: 26.7 cm. On the US side that single length splits into a men's 9 and a women's 10.5.
What is UK 8.5 in centimetres?
UK 8.5 is a foot length of 26.7 cm. That figure is the anchor for the whole chart, so it is also UK 8.5, EU 42.5 and a US women's 10.5.
What if I am between two sizes?
Size up. A shoe that is slightly long stays wearable with a thicker sock or an insole, while a shoe that is too short cannot be fixed. Foot length also increases through the day, so measure in the afternoon.
Last reviewed and updated on July 25, 2026. Conversion tables are checked against published international sizing standards.