Barefoot size guide

Measure the foot, not the shoe

The measurements in this chart refer to the foot, never to the insole or the outsole of the shoe. Here you take two measurements: length and width.

It takes two minutes and you only need things you already have at home: a sheet of paper, a pencil and a ruler.

  • Put the sheet of paper on the floor, right up against a wall.
  • Place the foot on it, with the heel touching the wall and the foot completely flat. It's best done standing up, with the weight spread evenly across both feet.
  • Length. Mark on the paper where the longest toe ends (it isn't always the big toe), take the foot away and measure from the edge of the paper to the mark.
  • Width. With the foot back in place, measure the widest part of the foot, across the metatarsals, just before the toes begin.
  • Take both measurements on the other foot too and go by the larger ones.

Measure at the end of the day, when the foot is at its largest, and with bare feet.

Size chart · barefoot line
Foot length EU Foot width
11.5 - 12.1 cm 19 5.1 cm
12.2 - 12.7 cm 20 5.2 cm
12.8 - 13.4 cm 21 5.4 cm
13.5 - 14.1 cm 22 5.5 cm
14.2 - 14.7 cm 23 5.6 cm
14.8 - 15.4 cm 24 5.7 cm
15.5 - 16.1 cm 25 5.8 cm
16.2 - 16.7 cm 26 6.0 cm
16.8 - 17.4 cm 27 6.1 cm
17.5 - 18.0 cm 28 6.3 cm
18.1 - 18.7 cm 29 6.5 cm
18.8 - 19.4 cm 30 6.6 cm
19.5 - 20.1 cm 31 6.8 cm
20.2 - 20.7 cm 32 7.0 cm
20.8 - 21.4 cm 33 7.1 cm
21.5 - 22.1 cm 34 7.2 cm
22.2 - 22.9 cm 35 7.3 cm
23.0 - 23.7 cm 36 7.4 cm

How to read the chart

Length sets the size. Find the centimetre range in the first column that your length measurement falls into: the size is the one in the EU column of the same row. The ranges don't overlap, so each measurement falls into one row only.

Width is the check. The third column is the foot width that corresponds to each size. Compare it with the one you've measured: it tells you whether that size is roomy or snug across the forefoot, which is what people ask about most in this line.

This chart is only for models in the barefoot line. For the rest of the children's footwear, use the children's size guide, which has its own centimetre ranges.

The guide starts at size 19 and ends at 36. If you need a larger size, the adult size guide starts at 36: it's a different last and a different chart, so compare the foot measurement against that one again.

Questions about choosing a size

Why does this guide also measure width?

Because in this line the forefoot is the measurement people ask about most. The size is always chosen by foot length; the width in the chart tells you which forefoot measurement corresponds to that size, so you can compare it with the one you've taken.
I've measured the width and it doesn't match the one in my row. What should I do?

Length sets the size. If the width you've measured is quite far from the value in your row, email us at info@biomecanics.com with both measurements and the model you're interested in, and we'll look at it with you before you buy.
What about UK and US equivalents?

In this line the size is taken from the foot measurement in centimetres, which is the most reliable reference. If you need the equivalent in another system, email us at info@biomecanics.com or call us on (+34) 966 633 941 and we'll confirm it for that particular model.
Can I use this chart for the rest of the children's footwear?

No. Children's footwear on the standard last has its own guide, and its centimetre ranges aren't identical to these. Always check the guide for the line of the model you're interested in.
Which sizes does this guide cover?

Sizes 19 to 36. The adult size guide starts at 36, with a different last and a different chart.
Do I measure the foot or the insole of the shoe?

The bare foot. Neither the insole nor the outsole is a reliable reference: both are larger than the foot that goes inside, and measuring them leads to a size bigger than the one needed.