On sizing chart updates
(3 total)- 2026-10-30 — Added carousel for other dynamic sizing converters
- 2026-10-30 — Added toggle to switch between chart and converter modes
- 2026-10-30 — Published ON sizing chart/conversion guide
Select your sizing tool
Use the toggle to select between traditional (default view) ON shoe sizing charts, and our custom-calibrated universal sizing convertor. Our universal size convertor allows you to convert a particular ON size into another size from a dozen brands, including ON-to-ON conversions across US/UK/EU/CM sizes. At the bottom of this page, you’ll find links to our complete set of dynamic sizing convertors. Learn more about how we designed our advanced sizing calculators.
Unlike adidas and Nike, ON maintains separate charts for men’s and women’s sizes. That’s because ON uses a different translation standard between US, EU, and CM sizes for men and women. Because of this discrepancy, we recommend you use our dynamic sizing converters for better accuracy. The official ON sizing charts also contain MX (Mexico) and BR (Brazil sizes). Since the MX sizing standard is identical to CM sizing, we have excluded these duplicate entries. We have excluded BR sizing runs from the chart and converter because of its limited worldwide usage. Brazilian sizing follows a different (Portuguese) standard, where it is 1.5 to 2 sizes smaller than a typical EU size. For example, a ON BR size 39 translates into EU 40.5, and a BR 40 is equal to EU 42.
ON MEN’S SHOE SIZE CHART
| US - Men | UK | EU | CM/JP |
|---|---|---|---|
| 3.5 | 3 | 35.5 | 21.5 |
| 4 | 3.5 | 36 | 22 |
| 4.5 | 4 | 37 | 22.5 |
| 5 | 4.5 | 37.5 | 23 |
| 5.5 | 5 | 38 | 23.5 |
| 6 | 5.5 | 38.5 | 24 |
| 6.5 | 6 | 39.5 | 24.5 |
| 7 | 6.5 | 40 | 25 |
| 7.5 | 7 | 40.5 | 25.5 |
| 8 | 7.5 | 41 | 26 |
| 8.5 | 8 | 42 | 26.5 |
| 9 | 8.5 | 42.5 | 27 |
| 9.5 | 9 | 43 | 27.5 |
| 10 | 9.5 | 44 | 28 |
| 10.5 | 10 | 44.5 | 28.5 |
| 11 | 10.5 | 45 | 29 |
| 11.5 | 11 | 46 | 29.5 |
| 12 | 11.5 | 47 | 30 |
| 12.5 | 12 | 47.5 | 30.5 |
| 13 | 12.5 | 48 | 31 |
| 13.5 | 13 | 48.5 | 31.5 |
| 14 | 13.5 | 49 | 32 |
| 15 | 14.5 | 50 | 33 |
ON WOMEN’S SHOE SIZE CHART
| US - Women | UK | EU | CM/JP |
|---|---|---|---|
| 5 | 3 | 36 | 22 |
| 5.5 | 3.5 | 36.5 | 22.5 |
| 6 | 4 | 37 | 23 |
| 6.5 | 4.5 | 37.5 | 23.5 |
| 7 | 5 | 38 | 24 |
| 7.5 | 5.5 | 38.5 | 24.5 |
| 8 | 6 | 39 | 25 |
| 8.5 | 6.5 | 40 | 25.5 |
| 9 | 7 | 40.5 | 26 |
| 9.5 | 7.5 | 41 | 26.5 |
| 10 | 8 | 42 | 27 |
| 10.5 | 8.5 | 42.5 | 27.5 |
| 11 | 9 | 43 | 28 |
| 12 | 10 | 44 | 29 |
Try our other sizing tools.
HOW TO MEASURE YOUR FEET
Place your larger foot on the ruler so that the longest tip of the foot lines up with the ruler markings. Record the CM measurement, with a +- 2 mm variance allowance. The heel should not be pressed hard against the wall; use a light touch. Enter the recorded CM value into our conversion tool.
We recommend getting a brand-name ruler (like Staedtler) from your neighborhood Staples for accurate measurements.
To find out your foot size (we recommend centimeters), place the flat end of a larger ruler against a wall. Wear your running socks, and place the foot over the scale. Add a margin of 2-3 mm, and find the next full or half CM size. In this example, the foot is placed at 27.7 CM marker, so the next full size is 28 CM. That’s the value that select in our tool. For accurate results, do not press your heel against the wall but maintain just the lightest contact. If your left or right foot is larger than the other, use the larger of the two to measure your size.