Of many things that make the process of buying a running shoe tricky, footwear sizing has its special place.
There are four different types of sizing – US, UK, EU and CM. Depending on the brand, the EU size might also be called FR (French), and the CM size as JP.
Not all brands follow a standard conversion across sizes. For examples, many US brands like Brooks, Saucony and Nike convert US sizes into UK sizes with a whole size (US 11 = UK 10), while brands such as adidas, Hoka One One and New Balance apply a half-size conversion. (US 10 = UK 10.5). And here is where it gets complicated; for smaller sizes such as US 6 and US 6.5, Nike applies a half-size conversion.
All this can make anyone’s head spin, so here’s an easy trick.
Out of the four, only the CM (short for centimeter) represents the actual length of the foot which is likely to fit in the shoe. When in doubt, always use the CM or JP size as your north star.
For example, if you know the size of your non-Nike running shoe, say a Mizuno, then see what the CM/JP size for that shoe is. Of course, the heel-to-toe length isn’t the only factor which determines the fit.
The actual fit depends on how the shoe is designed, including what kind of last (the fit profile) used. But the CM or JP is a reliable sizing guide, because it stands for actual length.
Here’s the Nike shoe size chart. If you’re swapping your existing Nike shoe for a Nike, then you’ll probably fit in the same size.If you’re switching brands, then sticking to the same JP or CM size is a good place to start.
For example, if you’re a CM 25 in an adidas, then reference the CM 25 row in the Nike sizing chart.
Nike size conversion chart – Men’s shoes
|US size||UK Size||EU/FR Size||CM/JP Size|