If you wear a US 9 in Nike, what size should you get in Adidas, Asics, or New Balance? Our Universal Brand Shoe Size Converter compares the sizing charts of 12 footwear brands to find your closest equivalent size.
Choose the brand and size you currently wear, then select the brand you’re switching to.
The converter covers Nike, Adidas, New Balance, Asics, Hoka, Puma, Brooks, Saucony, On, Salomon, Altra, and Mizuno.
Universal Brand Shoe Size Converter
How to Convert Shoe Sizes Between Brands
Under Your Current Shoe, choose the brand you wear now. Select men’s or women’s sizing, then enter your size in US, UK, EU/FR, or JP.
Under Shoe You Want, choose the brand you’re thinking of buying.
Look at the Convert To results. You’ll see the corresponding sizes from the selected brand’s chart in US Men’s, US Women’s, UK, EU/FR, and JP.
Why Shoe Sizes Differ Between Brands
You’d think a US men’s 9 would have the same UK or European equivalent regardless of the brand. Check Nike and Adidas, though, and you’ll find something different.
According to their official size charts:
- Nike’s official size chart: US men’s 9 = UK 8 / EU 42.5
- Adidas’ official size chart: US men’s 9 = UK 8.5 / EU 42⅔
A US 9 on both boxes, but two different conversions.
Adidas also uses EU sizes like 42⅔ and 43⅓, which you won’t find on Nike’s chart. Nike sticks to whole and half EU sizes.
My advice: If you wear a UK 8 in Nike, don’t automatically order a UK 8 in Adidas. Start with the size you already know fits, then use the converter to find its equivalent on Adidas’ chart. That’s a better starting point than matching the number on the box.
Popular Shoe Brand Size Comparisons
I’ve compared quite a few sneakers from different brands, and sometimes I wear the same size in both. Other times, I need to go up or down half a size. Here are three comparisons from my own rotation.
Nike vs Adidas: Nike Dunk vs Adidas Samba sizing. I wear a US 9 in the Dunk Low and a 9.5 in the Samba. The Samba fits narrower through the forefoot, and going up half a size gives me the room I need.
Nike vs New Balance: New Balance 2002R sizing guide. I wear a US 9 in the 2002R, Nike Air Max 90, and Vomero 5, but they don’t all feel the same on my feet. I’ve included the fit differences in the guide.
Nike vs Asics: Nike Vomero 5 vs Asics Gel-Kayano 14 sizing. I wear a US 9 in both, but they fit differently enough that I wouldn’t choose between them based on the size chart alone.
Does the Same Shoe Size Fit the Same Across Brands?
Not necessarily. I wear a US 9 in both the Nike Dunk Low and the Air Jordan 1, but the Dunk has a little more width and height in the toe box. The Jordan 1 fits closer through the midfoot, and I prefer how securely it holds my heel.
I also wear a US 9 in the Asics Gel-Kayano 14 and Nike Vomero 5. The Kayano wraps more closely around my slightly wide forefoot and midfoot. The pressure around the ball of my foot eased after a few wears, although the Vomero 5 still leaves me noticeably more room across the toes.
If I’m buying a sneaker from a brand I haven’t worn before, I’ll use the converter to narrow down the size. Before ordering, though, I still want to know how that particular model fits, especially around the forefoot.
For another reference, you can check New Balance’s official size guide to see how the brand lists its US, UK, and EU sizes.
More Shoe Size Calculators and Sizing Guides
Shoe Size Charts & Calculator: Convert between US, UK, EU, centimeters, and inches. I’ve also included kids’ size charts and printable measuring tools.
How to Measure Your Feet at Home: I walk through measuring both feet on paper, finding the widest part of your forefoot, and checking your measurements against a size chart.
What Do D, E, EE, and 2E Mean in Shoe Size?: A closer look at shoe width letters, including why a men’s D is considered standard width while a women’s D is wide.
Final Thoughts
When I’m buying from a different brand, I use the size of a pair I already own as my starting point.
I’d rather compare the manufacturers’ charts than assume my usual US, UK, or EU size means the same thing everywhere.
The Universal Brand Shoe Size Converter makes that comparison easier, but I’d still check the fit of the specific sneaker before ordering. I’ve worn plenty of shoes in a US 9, and some have needed more room around my forefoot than others.
Give the converter a try, and let me know in the comments which two brands you’re comparing. I’d also be interested to hear if you’ve had to change sizes when switching brands.