Adidas vs Nike Sizing | How Do They Compare in Size?

For many, Adidas and Nike are the go-to brands for sportswear apparel and footwear. Although American-founded Nike is the higher earner of the two, German brand Adidas is a close second. Both are beloved by athletes and casual shoe wearers across the globe.

Our guide explores Adidas vs. Nike sizing. If you’re considering switching from one to the other, you’re likely already sold on design and quality. Sizing is a vital concern as well, and it can be tricky when you’re dealing with international conversions.

We’ll discuss Nike to Adidas shoe size conversion, general fitting tips, and sizing advice for both manufacturers to help you get a snug, comfy fit.

Sizing of Adidas vs. Nike shoes includes:

  • What are the differences?
  • Nike to Adidas shoe conversion.
  • Adidas runs bigger.
  • Company-specific size chart.


Nike to Adidas Shoe Size Conversion

Before we discuss calculating the Nike to Adidas shoe size conversion, remember that this isn’t the only route you can take to determine your size.

compare Adidas vs Nike Sizing

For an even more accurate fit, use the brand-specific sizing chart and follow the advice we outline below.

We’ll start with the similarities. Nike and Adidas both provide generic size charts for men, women, and juniors. The two offer conversions from inches and centimeters into US shoe sizes.

Now, let’s talk about the differences. The Adidas size chart shows the UK, EU, and JP (centimeter) sizes for adults, whereas Nike only lists US sizes.

Adidas runs bigger than Nike by up to 5 millimeters. For example, if you’re a women’s size 8 for Adidas, your foot is 9.7-inches long. The same size on Nike tallies up to 9.62 inches, about a millimeter smaller.

The disparity is more evident with half sizes. A women’s 6.5 translates to 9.12 inches on Nike and 9.2 inches on Adidas, which is a fairly big gap.

You can find the Adidas adult sizes here, and kids’ sizes here. For Nike, men can take a look at their sizes here, women here, and juniors here.


Our Tricks to Get the Perfect Fit

which different between Adidas vs Nike Sizing

Shoe sizing seems deceptively simple, but it can require more thought than you think. Try our techniques to lower the chances of getting a bad fit:

  • Never assume or guess what size you are. Measure your feet from the heel to your longest toe. You can do this by tracing your foot on a piece of paper. Make sure you place your heel against the wall and try to be precise if you’re by yourself. Watch this video for more measuring techniques.

  • Even if you’re buying the exact same brand and style of shoes you already own, size yourself. Your footwear can loosen with age, and your feet can change over time with age, illness, or after pregnancy.
  • Remember to consult the size chart of the brand you’re buying from. Don’t risk converting the sizes wrong and having to return your footwear.
  • If you wear insoles to support your feet at work or while you play your favorite sport, don’t forget to try them in your shoes. Your pair might fit perfectly but turn out to be too tight once you slip your inserts in.
  • Socks can be a game-changer for how your footwear fits. Athletes, in particular, should wear their socks of choice with their new shoes. Your everyday socks aren’t the same as lightweight runner’s socks.
  • If your shoes are uncomfortably tight or your feet are slipping out, that means you may need to go up or down a half size or more. Poorly-sized shoes heighten your chances of falls, foot deformities, and pain.
  • Take the time to read the reviews about your shoes before you buy them. Are customers complaining that they’re too narrow or loose? Do many people complain that they’re receiving a size too large or too small?


Pro Tips

  • Measure your feet after a typical day or training session. Your feet will swell throughout the day, particularly if your job or sport puts a lot of pressure on them.
  • For the same reason, try on your new shoes at a similar time. A looser fit first thing in the morning might not correspond to your true size, before your feet swell.
  • Don’t be afraid to test out your footwear thoroughly. Both Adidas and Nike have 30-day return policies. Walk, run, and jump in your new shoes to see if they’re comfortable. Do this indoors on clean or carpeted floors, as you don’t want to void the return policy with damage or dirt.


Additional Sizing Tips for Nike Shoes

how to compare between Adidas vs Nike Sizing

If your new footwear is going to be from Nike, bear in mind these suggestions:

  • Nike has a mobile app to make things easier for prospective buyers. Download Nike Fit, and it will calculate your size for any model of shoe based on a photo of your feet. For greater accuracy, you can head to a Nike store and stand on a Nike Fit mat.
  • The inches version of the size chart may be too math-heavy for some. If you’re not willing to convert one-eighths and three-quarters into fractions, you might want to measure your feet in centimeters.


Additional Sizing Tips for Adidas Shoes

asking about Adidas vs Nike Sizing

Are you choosing a pair of Adidas to add to your collection? Here are a few tips for the brand:

  • If you’re buying shoes for your infant or child, they’ll come with adiFIT You can compare your little one’s feet to the inserts to ensure they fall within the appropriate size range.
  • Adidas recommends going one size up or one size down if you’re between sizes and want a looser or tighter fit, respectively.
  • Although Adidas shoes usually fit true to size, the Ultraboost line is an exception. For Ultraboost 1.0 and 2.0, the company suggests choosing half a size larger if you have wide feet.
  • On that note, Cloudfoam shoes for women may run bigger. Although many buyers are satisfied with their regular sizes, some have found the shoes too large by at least half a size. Read our article on how Adidas shoes fit here to learn more.


Frequently Asked Questions

Do Adidas Run Bigger or Smaller Than Nike?

Yes, Adidas runs bigger than Nike, anywhere from 1 to 5 millimeters. That’s why you should rely on the company-specific size chart rather than size conversions.


Do Adidas and Nike Fit the Same?

No, and you shouldn’t think they do. Although some sizes may be similar, they’re not going to be identical. Every shoe is different, and it isn’t wise to presume one brand will fit the same as the other.


Adidas vs Nike Which Is Better?

The two rival companies have plenty to offer customers in the way of footwear. Both sell athletic and casual shoes from slides to sneakers in varying designs.

As to which one is better, that’s up to you. If you own a pair of each, you’ll be the final judge.


Enjoy Your New Adidas or Nikes

Now you have the lowdown on Adidas vs. Nike sizing. It isn’t our place to say which brand is best, but we can say that Adidas shoes run bigger than Nikes.

There are plenty of benefits of a perfectly-fitted shoe, not least of which is your comfort. For sports like soccer, your shoes can impact performance for the worse if they aren’t a good fit.

We hope that our guide has been informative. If you know anyone curious about Adidas and Nike sizing, please share our article with them. We want to hear your opinion of the two in the comments.


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