Kids Barefoot Shoe Size Chart by Age (2026)
A size-by-age reference table for barefoot shoes, with foot length in millimeters, EU, US and UK sizes, and the growth-room math that keeps it accurate.
Use age only as a starting point. Find your child's age band in the chart for a size range, then measure the foot heel to longest toe in millimeters and add 10 to 12mm of growth room. Foot length, not age, gives the real size, because healthy kids vary by two to three sizes at any age.
Every parent has done the same thing at least once: typed their kid's age into a search bar hoping a size will pop out. It does not work that way, and the chart below tells you why. Two kids the same age can be three sizes apart. So treat this as a starting point, then confirm with a real measurement.
Kids barefoot shoe size chart by age (2026)
This table maps a child's age to the typical foot length, then to the EU, US and UK shoe sizes most barefoot brands print on their boxes. The "foot length" column is what actually matters. The age column is the loose guide everyone wants and nobody should trust on its own.
| Age | Typical foot length | EU size | US toddler/youth | UK | Re-measure every |
|---|---|---|---|---|---|
| 12-18 months | 110-120mm | 20-21 | 5-5.5T | 4-4.5 | 8 weeks |
| 18-24 months | 120-130mm | 21-22 | 5.5-6T | 4.5-5 | 8 weeks |
| 2 years | 130-140mm | 23-24 | 7-8T | 6-7 | 8-10 weeks |
| 3 years | 140-150mm | 24-26 | 8-9 | 7-8 | 10 weeks |
| 4 years | 150-160mm | 25-27 | 9-10 | 8-9 | 12 weeks |
| 5 years | 160-170mm | 27-28 | 10-11 | 9-10 | 12 weeks |
| 6 years | 165-180mm | 28-30 | 11-12 | 10-11 | 12 weeks |
| 7 years | 175-190mm | 30-31 | 12-13 | 11-12 | 14 weeks |
| 8 years | 185-200mm | 31-33 | 13-1Y | 12-13 | 14 weeks |
Ranges are pooled from published pediatric foot-growth data (Mauch 2008, Mickle 2008) and the inner-length specs barefoot brands publish. Your child can sit a full size outside their age band and still be completely normal.
Why "size by age" is the wrong question
Foot length at a given age varies by 15 to 20mm across healthy kids. That is two to three shoe sizes. Birth weight, walking onset, genetics and growth spurts all move the number. A 3-year-old can wear anything from an EU 22 to an EU 25 and be perfectly typical. If you buy off age alone you will be wrong roughly half the time, and wrong usually means too small.
The fix takes four minutes. Trace the foot, measure heel to longest toe in millimeters, then read the size off the brand's inner-length spec. Full walkthrough here: how to measure toddler feet at home.
How to use the chart: the growth-room math
Once you have a foot length in millimeters, do not buy a shoe with that exact inner length. Add room. A growing foot needs space at the front so the toes can splay and so you are not re-buying in three weeks.
The simple rule
- Add 10 to 12mm between the longest toe and the inside front of the shoe.
- Under 8mm of room and the shoe is already too small for a growth phase.
- Over 15mm and the kid trips, because the toe of the shoe lands before the foot does.
So a foot that measures 135mm wants a shoe with roughly 145 to 147mm of inner length. That is usually an EU 23 in most barefoot lines, but it is never guaranteed, which is the whole reason brands size differently.
Reading EU, US and UK sizes off the same foot
The three systems do not line up cleanly. EU sizes step in roughly 6.6mm increments, US sizes in about 8.5mm, and the toddler-to-youth US relabel resets the numbers entirely at around age 5. That is why your kid can be a "US 10 toddler" and a "US 10 youth" at two different sizes. If you are shopping across brands or across regions, work from the foot length and the inner-length spec, and treat the printed size as a label, not a fact. We break the cross-brand differences down in detail in the barefoot shoe size conversion guide.
When to re-measure (the right-hand column)
The last column of the chart is the one parents skip and regret. Toddler feet grow about half a size every two to four months. The window between "fits great" and "too tight" can be as short as four weeks during a spurt. Set a recurring phone reminder on the cadence in the table. For the full replacement logic and the thumb check, see when to size up and replace kids barefoot shoes.
Where Joyo kids sizes land on this chart
Joyo bakes about 10mm of growth room into its kids sizing, so once you have a foot measurement you size to the foot, not above it. The Joyo First Walker (TinyToes) covers the early-walker bands, and the Joyo Everyday Sneaker (KidStride) runs up through the youth sizes. Wide-footed kids should start at the First Walker Wide (LittleSteps) or read the wide-feet fit research first. To see how Joyo stacks against Vivobarefoot, Xero and the rest by inner length, the Kids Barefoot Shoe Index compares them side by side.
For the bigger picture on choosing kids barefoot shoes, the parents' complete guide is the place to start.
Frequently asked
What size shoe is a 2 year old?
Most 2-year-olds wear an EU 22 to 23, roughly a US 7 to 8 toddler, with a foot length around 130 to 140mm. But a 15 to 20mm spread is normal at this age, so measure the foot in millimeters before buying. Age alone gets the size wrong about half the time.
What is the shoe size chart for kids by age?
As a guide: 18-24 months is EU 21-22, age 2 is EU 22-23, age 3 is EU 23-25, age 4 is EU 25-27, age 5 is EU 27-28, age 6 is EU 28-30. Foot length matters more than age, so confirm by measuring heel to longest toe and adding 10 to 12mm of growth room.
How much bigger should I buy kids shoes?
Add 10 to 12mm between the longest toe and the front of the shoe. That is about a thumb's width on a younger child and gives roughly 8 to 12 weeks before the shoe gets tight. Less than 8mm is already too small for a growing foot. More than 15mm causes tripping.
Why does my kid's shoe size not match their age?
Because foot length at any age varies by two to three sizes across healthy kids. Genetics, walking onset and growth spurts all move it. A child sitting a full size above or below their age band is completely normal. Buy off the measured foot, not the birthday.
Do barefoot shoes use the same size chart as regular shoes?
No. Barefoot shoes are wider through the toe box and each brand uses a different last and a different growth-room convention. A child who is an EU 24 in a conventional shoe might be an EU 23 in one barefoot brand and an EU 25 in another. Always compare your kid's foot length in mm to each brand's inner-length spec.
How often should the size chart be rechecked?
Re-measure every 8 weeks for kids under 3, every 10 to 12 weeks for ages 3 to 5, and every 14 weeks for ages 6 and up. Toddlers grow about half a size every two to four months, and a spurt can take a good-fitting shoe to too-tight in as little as four weeks.
