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On has gone from running brand to streetwear staple in a short time, and its sizing gives away its origins. In terms of length, On fits true to size — confirmed by the brand itself and thousands of reviews. But on the UK scale, every row differs from the standard conversion.
- The UK column is the tricky part
- Their Japanese column is the measurement in centimeters
- Fit
- The full size chart
- Frequently asked questions
The UK column is the tricky part
All sixteen men’s sizes and all fourteen women’s sizes have a different UK value than a generic size chart would predict. The difference is smaller for EU sizes: seven of the sixteen men’s sizes and four of the fourteen women’s sizes differ.
In short: order by EU size or centimeters, not by a UK size converted from memory.
Their Japanese column is the measurement in centimeters
On publishes a JP column that is actually the foot length in centimeters. The brand confirms this itself, and three independent retailers use the same figures.
We have included those values as centimeters, so the cm column below shows On’s own foot-length measurements. For a running brand, that is immediately the most reliable way to choose your size.
Fit
On fits true to size: take your usual size. What you may read online about “On running narrow” does not apply across the entire brand — it varies by model, and the differences are significant. We only comment on this once we have investigated it for each individual model.
The On size chart
Men
| EU | UK | US | CM |
|---|---|---|---|
| 40 | 6.5 | 7 | 25 |
| 40.5 | 7 | 7.5 | 25.5 |
| 41 | 7.5 | 8 | 26 |
| 42 | 8 | 8.5 | 26.5 |
| 42.5 | 8.5 | 9 | 27 |
| 43 | 9 | 9.5 | 27.5 |
| 44 | 9.5 | 10 | 28 |
| 44.5 | 10 | 10.5 | 28.5 |
| 45 | 10.5 | 11 | 29 |
| 46 | 11 | 11.5 | 29.5 |
| 47 | 11.5 | 12 | 30 |
| 47.5 | 12 | 12.5 | 30.5 |
| 48 | 12.5 | 13 | 31 |
| 48.5 | 13 | 13.5 | 31.5 |
| 49 | 13.5 | 14 | 32 |
| 50 | 14.5 | 15 | 33 |
Women
| EU | UK | US | CM |
|---|---|---|---|
| 36 | 3 | 5 | 22 |
| 36.5 | 3.5 | 5.5 | 22.5 |
| 37 | 4 | 6 | 23 |
| 37.5 | 4.5 | 6.5 | 23.5 |
| 38 | 5 | 7 | 24 |
| 38.5 | 5.5 | 7.5 | 24.5 |
| 39 | 6 | 8 | 25 |
| 40 | 6.5 | 8.5 | 25.5 |
| 40.5 | 7 | 9 | 26 |
| 41 | 7.5 | 9.5 | 26.5 |
| 42 | 8 | 10 | 27 |
| 42.5 | 8.5 | 10.5 | 27.5 |
| 43 | 9 | 11 | 28 |
| 44 | 10 | 12 | 29 |
Still unsure?
Measure your foot from heel to longest toe and compare that length with the cm column. Do this while standing, at the end of the day, and measure both feet. The larger foot determines your size.
Once you know your size, you’re only two clicks away. Enter it in the filter and you’ll see only the shops that have your size in stock, starting with the cheapest. No more keeping multiple tabs open to compare prices, and no guesswork at checkout.
Frequently asked questions about On sizes
Does On run large or small?
On fits true to size. Both the brand itself and a large number of reviews point to the same conclusion: take your usual size.
Is my UK size correct for On?
No. All sixteen men’s sizes and fourteen women’s sizes have a different UK value than the standard conversion. Use the chart on this page to convert your size.
What does the JP column mean for On?
It is the foot length in centimeters. On confirms this itself, and several independent sources use the same values. That is why we show these figures in the cm column.