Adidas Kids Shoe Size Chart & Review Of The UltraBoost 21 Kids And UltraBoost DNA


In this article, we have the Adidas kids size chart for shoes.

Because each shoe brand model and style are based on different standards of measurement, it’s wise to use specific sizing charts for the brand of shoes that you’re buying.

The only issue is that sometimes each model will fit differently even under the same brand.

We all know that it’s not easy for parents to choose the perfect size kid shoes. For this reason, right below the size charts, we’re providing you with some information to help you get the right shoe size. 

Without further ado, let’s dive right into the kids’ size charts…


Adidas Kids Size Chart

Babies & Toddlers Adidas Shoe Size Conversion Chart

Babies & Toddlers
0 – 3 yrs US Size
Heel – Toe
in Inches
Heel – Toe
in cm
Adidas UK
Adidas EU
1K3.2″8.1 cm016
2K3.5″9.0 cm1K17
3K3.9″9.8 cm2K18
4K4.2″10.6 cm3K19
5K4.5″11.5 cm4K20
5.5K4.8″12.3 cm5K21
6K5.0″12.8 cm5.5K22
6.5K5.2″13.2 cm6K23
7K5.4″13.6 cm6.5K23.5
7.5K5.5″14.0 cm7K24
8K5.7″14.5 cm7.5K25
8.5K5.9″14.9 cm8K25.5
9K6.0″15.3 cm8.5K26
9.5K6.2″15.7 cm9K26.5
10K6.3″16.1 cm9.5K27

Related: Adidas Yeezy QNTM Size Chart & Review

Adidas Little & Big Kids Size Chart

Children Adidas
4 – 7 yrs US Size
Heel – Toe
in Inches
Heel – Toe
in cm
Adidas UK
Adidas EU
10.5K6.5″16.6 cm10K28
11K6.7″17.0 cm10.5K28.5
11.5K6.9″17.4 cm11K29
12K7.0″17.8 cm11.5K30
12.5K7.2″18.3 cm12K30.5
13K7.4″18.7 cm12.5K31
13.5K7.5″19.1 cm13K31.5
17.7″19.5 cm13.5K32
1.57.9″20.0 cm133
28.0″20.4 cm1.533.5
2.58.2″20.8 cm234
38.3″21.2 cm2.535

Related: Adidas Foam Runner Size Chart & Review

Youth & Teens Adidas Size Chart

Youth & Teens Adidas
8 – 16 yrs US Size
Heel – Toe
in Inches
Heel – Toe
in cm
Adidas UK
Adidas EU
3.58.5″21.6 cm335.5
48.7″22.1 cm3.536
4.58.9″22.5 cm436 2/3 *
59.0″22.9 cm4.537 1/3 *
5.59.2″23.3 cm538
69.4″23.8 cm5.538 2/3 *
6.59.5″24.2 cm639 1/3 *
79.7″24.6 cm6.540
7.59.8″25.0 cm740 2/3

Related: Adidas 380 Size Chart & Review

How To Measure Your Kids’ Feet For The Right Adidas Kids’ Shoe Size 

Most brands have printable size charts, but in case you can’t find one, you can always improvise.

Here are the simple steps to measure your kids feet without using a sizing chart. You’ll need a pen, a ruler and, an A4 size piece of paper to follow these.

Step 1


Place the paper on the floor. You can tape the paper to the ground temporarily using paper tape.

Step 2

Let the kids stand on the paper and press the kids foot gently on the paper so that it’s flat.

Related: Converse Size Chart + Fitting Technique

Step 3


Draw a line behind the heel and another one just in front of the longest toe. Measure the distance between the lines that you’ve drawn preferably in inches.


Step 4

Repeat the steps for the other foot and record the measurements.

Related: Alexander McQueen Size Chart

Tips For Proper Sizing Of Shoes

Add a tolerance of about 1/4″ to the measurements which you’ve recorded previously. The additional space allows for toe flexing in some level of growth.

Endeavor to measure both feet. If one foot is longer, use IT to select the shoe size. Every time you want to buy shoes for your kids, measure their feet because their feet grow rapidly.

If you intend to buy shoes worn with socks, do the measurements with the socks worn by the child.

Related: Adidas vs Puma

Kids vs women’s vs men’s sizing

In this section, we have a little bit of a comparison between the men’s sizes, the women’s sizes, and the GS sizes or the kids’ sizes.

I think a lot of people don’t really know the difference between a men’s, women’s, and kids as well as the sizing between them and which ones you should go with.

Let’s take the kids UltraBoost Uncaged for example. The kids’, women’s, and men’s are basically the exact same thing.

The kid sizes are $160, the men’s and women’s are $180. SO, why are the Kids UltraBoost $20 less?

I think that it’s just a kind of a subliminal thing that they throw out there because they don’t give you all the stats for the shoe.

With Adidas kids, they’re not really clear as to what you’re getting. For example, it says durable knit upper for breathability for the kids, and on the men’s and women’s, it says Primeknit.

However, if you hold the UltraBoosts up close, you aren’t going to be able to tell the difference between which is the men’s and which is the GS’s. It’s literally the same stuff.

So, I think they left the fancy words off on the kids’ version on purpose literally because I guess they want to trick you into getting the more expensive women’s version if you are a women’s foot size.

If you’re smart and savvy enough to not do that and buy the kids version, you will see that it’s, again, pretty much the exact same thing.

  • The build is exactly the same.
  • The back construction is exactly the same.
  • The laces and the lace tips are exactly the same.
  • The collar is exactly the same.
  • The Continental rubber and traction is exactly the same.
  • The torsion system is exactly the same.

However, I find the collar to be a little bit thicker on the men’s than the women’s and the kids.

I also find the Boost midsole to bit a little bit more squishy and more pliable on the GS than the men’s and I’m not sure why.

Overall, it’s pretty much the same thing. So, for $20 less, you can get the kids’ size and it’s fundamentally the same exact thing as the women’s.

I know there’s a stigma like “oh, you’re buying a woman’s shoe”, but they’re literally the same exact shoe. The only main difference is the sizing is a little bit different on the men’s versus women’s.


If you’re 6.5 women’s, go down 1.5 sizes in the kids and I think you should be just fine with the 5.

Hopefully, that debunks any myths that you might have had out there that the GS sizes and the women’s sizes are less of a product than the men’s size. They’re all pretty much the same thing.

So, again, for $20 savings, it’s worth doing.

Related: Best Adidas Running Shoes

Adidas Kids UltraBoost 21


Related: Adidas NMD vs UltraBoost

Your kid will have the freshest kicks in class with the Adidas UltraBoost 21. The Primeknit upper is made with PrimeBlue which utilizes Parley Ocean plastic for awesome sustainable components to this style.

The soft knit will hug your foot like a sock and the lace-up closure will give you a customizable fit.

The stretchy collar has cushioning at the heel for Achilles support and the removable insole adds an extra layer of comfort.

The Boost midsole has been designed to deliver 6% more Boost throughout the foot.


Underneath, there’s a Continental rubber outsole with Adidas’ new LEP torsion system which has been engineered for a more responsive run and energizing feel.

Related: Adidas UltraBoost Size Chart & Review

Adidas Kids UltraBoost DNA


The for a totally out-of-this-world style.

The shoe has a removable insole with the NASA logo on the heel and this fun graphic of the moon landing. The inside has a soft textile lining with padding around the heel for a super comfy fit.

This pair has functional laces on the top for a secure fit and the upper is their Primeknit material that is soft and breathable with a bootie-like construction that will hug the foot nicely.

These sneakers also have the Adidas Boost midsole for underfoot cushioning and shock absorption.

Underneath, there’s a flexible stretch web Continental rubber outsole which makes the UltraBoost 20 DNA feel like they can fly to the moon.

I guess that’s pretty much it. Hopefully, you found this Adidas Kids size chart and comparison between the men’s women’s, and kids helpful.

About Eric Barber

Eric Barber is a happy father of two little angels, a husband, and a runner. He eats, sleeps, and dreams anything foot related: running shoes, walking shoes, sneakers, you name it. It all started when Eric was a shoe store specialist watching and fitting people's feet day in and day out.

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