Measure first. Compare the exact shoe.
A useful size starts with your foot measurements and the chart for the model you want. Age, a familiar EU number or the word “barefoot” cannot tell you whether a pair will fit.
Record both feet
You need paper, a pencil and a ruler. Follow the measuring instructions supplied with the shoe’s size chart, especially when they specify socks, standing position or a printable template.
- For a standing measurement, put the paper on a firm, level surface and keep it still. Do not force a child who cannot stand comfortably to use this method.
- Mark the heel and the end of the longest toe with the pencil upright. Measure the distance between the marks.
- Repeat for the other foot and record both lengths. Note the wider foot or any difference in shape as well.
- Compare those measurements with the exact model’s instructions. Keep foot length separate from shoe or insole length.
Download the free fit-notes worksheet (PDF) or use the plain-text version. It is a notes sheet for measurements and two shoe options, not a printable ruler or a size calculator.
Check what the chart measures
There is no universal barefoot shoe size chart. Some charts list recommended foot length; others list internal shoe or insole measurements. Adding extra room to a recommendation that already includes it can lead to a poor fit.
- Recommended foot length
- Match your measurement to the model’s stated range. Read its allowance instructions before adding anything.
- Internal shoe or insole length
- Use the maker’s guidance on room for that model and intended use. An insole measurement is not automatically the usable space inside the shoe.
- EU, UK and US labels
- Labels can vary between brands and ranges. Confirm the label against the model chart rather than converting by a single universal rule.
- Width and volume
- Length is only one part of fit. Check toe shape, space over the instep and how the fastening secures the heel.
Our kids’ size-chart guide and cross-brand size-label guide explain these distinctions.
Try the fit before keeping the pair
- Check both feet with the socks or insoles intended for the shoe.
- Look for pressure at the toes, sides and instep, and whether the heel stays secure during ordinary movement.
- Do not automatically size up between sizes. A different width, shape or fastening may be more useful than extra length.
- For children, reassess if comfort or movement changes and remeasure before buying another pair. Do not rely on age alone.
If footwear causes pain or you have a diagnosed condition or prescribed footwear requirements, ask the treating clinician about the choice. This guide does not assess medical suitability.
Use your measurements to make a shortlist
Our comparisons organize published specifications; they do not guarantee fit. For JOYO products, review the return policy and contact us if model sizing is unclear. For other brands, check that retailer’s current shipping and return terms before buying.
Common fit questions
Does “wide toe box” mean the shoe will fit any wide foot?
No. Toe shape, midfoot width, instep volume and fastening also affect fit. Compare the specific model and ask the retailer about missing measurements.
Should I add the same amount of growing room to every kids’ shoe?
No. Follow the model’s sizing instructions and check whether the chart already includes an allowance. A shoe still needs to stay secure during movement.
Is the worksheet a printable measuring template?
No. It records your own measurements, model details and return notes. Use a ruler and the manufacturer’s measuring method.
Sources: Vivobarefoot measuring guide and Be Lenka sizing FAQ, reviewed September 19, 2026. Manufacturer instructions apply to their own footwear. JOYO also sells children’s shoes.