On Shoe Size Chart
On's own published size chart, matched to real measured foot length. Measure your foot once and read your On size directly from the table below — or use the shoe size calculator to do it for you and compare against 34 other brands.
On men's size chart
| Foot length (cm) | US | UK | EU | JP |
|---|---|---|---|---|
| 22 | 4 | 3.5 | 36 | 22 |
| 22.5 | 4.5 | 4 | 36.67 | 22.5 |
| 23 | 5 | 4.5 | 37.33 | 23 |
| 23.5 | 5.5 | 5 | 38 | 23.5 |
| 24 | 6 | 5.5 | 38.67 | 24 |
| 24.5 | 6.5 | 6 | 39.33 | 24.5 |
| 25 | 7 | 6.5 | 40 | 25 |
| 25.5 | 7.5 | 7 | 40.67 | 25.5 |
| 26 | 8 | 7.5 | 41.33 | 26 |
| 26.5 | 8.5 | 8 | 42 | 26.5 |
| 27 | 9 | 8.5 | 42.67 | 27 |
| 27.5 | 9.5 | 9 | 43.33 | 27.5 |
| 28 | 10 | 9.5 | 44 | 28 |
| 28.5 | 10.5 | 10 | 44.67 | 28.5 |
| 29 | 11 | 10.5 | 45.33 | 29 |
| 29.5 | 11.5 | 11 | 46 | 29.5 |
| 30 | 12 | 11.5 | 46.67 | 30 |
| 30.5 | 12.5 | 12 | 47.33 | 30.5 |
| 31 | 13 | 12.5 | 48 | 31 |
| 31.5 | 13.5 | 13 | 48.67 | 31.5 |
| 32 | 14 | 13.5 | 49.33 | 32 |
On women's size chart
| Foot length (cm) | US | UK | EU | JP |
|---|---|---|---|---|
| 22 | 5.5 | 5 | 36 | 22 |
| 22.5 | 6 | 5.5 | 36.67 | 22.5 |
| 23 | 6.5 | 6 | 37.33 | 23 |
| 23.5 | 7 | 6.5 | 38 | 23.5 |
| 24 | 7.5 | 7 | 38.67 | 24 |
| 24.5 | 8 | 7.5 | 39.33 | 24.5 |
| 25 | 8.5 | 8 | 40 | 25 |
| 25.5 | 9 | 8.5 | 40.67 | 25.5 |
| 26 | 9.5 | 9 | 41.33 | 26 |
| 26.5 | 10 | 9.5 | 42 | 26.5 |
| 27 | 10.5 | 10 | 42.67 | 27 |
| 27.5 | 11 | 10.5 | 43.33 | 27.5 |
| 28 | 11.5 | 11 | 44 | 28 |
| 28.5 | 12 | 11.5 | 44.67 | 28.5 |
| 29 | 12.5 | 12 | 45.33 | 29 |
| 29.5 | 13 | 12.5 | 46 | 29.5 |
| 30 | 13.5 | 13 | 46.67 | 30 |
| 30.5 | 14 | 13.5 | 47.33 | 30.5 |
| 31 | 14.5 | 14 | 48 | 31 |
| 31.5 | 15 | 14.5 | 48.67 | 31.5 |
| 32 | 15.5 | 15 | 49.33 | 32 |
On kids' sizing
On does not publish a children's chart distinct from the standard youth scale, so we show the general children's progression rather than presenting it as On-specific. See the international shoe size chart for that scale.
How to measure for On
On uses a Mondopoint-based system where each full US size corresponds to about 1cm of foot length; measure heel-to-toe standing, using the longer foot.
On fit guidance
On running shoes generally run true to size; if between sizes, On recommends sizing up. Note: some retailers report On's UK women's sizing is mislabeled identically to men's UK sizing on certain size charts -- use the US or CM columns for the most reliable fit. On does make children's shoes — a Junior band around UK 10 to 2.5 and a Youth band around UK 3 to 5.5, including Cloud Sky, Cloudsurfer Youth and Cloudswift Kids. On does not publish a children's foot-length chart, though, and the third-party charts that do disagree with each other, so the figures shown here are the standard youth scale rather than On's own. On's own advice is to measure the longer foot and size up if between sizes, since children's feet grow quickly.
Where this data comes from
- On official size guide
- On size chart, numeric table (Comfort One Shoes)
- On sizing detail incl. known UK labeling quirk (Absolute-Snow)
Sizing information reviewed September 2026. Manufacturers revise their charts from time to time — always confirm against the specific model before buying.
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