WITHIN · SIZES · Updated 10 October 2026
On size chart
Every On chart we could read, side by side, with its source and the day it was read.
- Charts: 2 charts, 30 sizes
- Systems: US, UK, EU, Japan, Mexico and Brazil
- Sources: On
- Read: 10 October 2026
How On fits
On's Cloudtilt and Cloudrunner 3 Max pages both say the shoe fits true to size.
Source: On (on.com, 2 pages), read 10 October 2026.
On says its women's sizes are one and a half sizes above its men's. A men's US 7 is a women's US 8.5.
Source: On (on.com), read 10 October 2026.
On says its men's shoes are made wider than its women's.
Source: On (on.com), read 10 October 2026.
On says Japan sizes are in centimetres. To check yours, stand barefoot with your heel against a wall, measure your foot, and add about 1 cm.
Source: On (on.com), read 10 October 2026.
For running, On says your shoe should be at least half a size bigger than your street shoe, since feet swell when you run.
Source: On (on.com), read 10 October 2026.
On men's shoe sizes
| US | UK | EU | Japan | Mexico | Brazil |
|---|---|---|---|---|---|
| 7 | 6.5 | 40 | 25 | 25 | 37 |
| 7.5 | 7 | 40.5 | 25.5 | 25.5 | 38 |
| 8 | 7.5 | 41 | 26 | 26 | 39 |
| 8.5 | 8 | 42 | 26.5 | 26.5 | |
| 9 | 8.5 | 42.5 | 27 | 27 | 40 |
| 9.5 | 9 | 43 | 27.5 | 27.5 | 41 |
| 10 | 9.5 | 44 | 28 | 28 | |
| 10.5 | 10 | 44.5 | 28.5 | 28.5 | 42 |
| 11 | 10.5 | 45 | 29 | 29 | |
| 11.5 | 11 | 46 | 29.5 | 29.5 | 43 |
| 12 | 11.5 | 47 | 30 | 30 | 44 |
| 12.5 | 12 | 47.5 | 30.5 | 30.5 | 45 |
| 13 | 12.5 | 48 | 31 | 31 | 46 |
| 13.5 | 13 | 48.5 | 31.5 | 31.5 | 47 |
| 14 | 13.5 | 49 | 32 | 32 | |
| 15 | 14.5 | 50 | 33 | 33 | 47 |
- On prints no foot length on this chart. Japan sizes are in centimetres.
- Blank cells: On prints no Brazil size for these US sizes.
Source: On (on.com, 2 pages), read 10 October 2026.
On women's shoe sizes
| US | UK | EU | Japan | Mexico | Brazil |
|---|---|---|---|---|---|
| 5 | 3 | 36 | 22 | 22 | 33 |
| 5.5 | 3.5 | 36.5 | 22.5 | 22.5 | 34 |
| 6 | 4 | 37 | 23 | 23 | |
| 6.5 | 4.5 | 37.5 | 23.5 | 23.5 | 35 |
| 7 | 5 | 38 | 24 | 24 | 36 |
| 7.5 | 5.5 | 38.5 | 24.5 | 24.5 | 37 |
| 8 | 6 | 39 | 25 | 25 | |
| 8.5 | 6.5 | 40 | 25.5 | 25.5 | 38 |
| 9 | 7 | 40.5 | 26 | 26 | 39 |
| 9.5 | 7.5 | 41 | 26.5 | 26.5 | |
| 10 | 8 | 42 | 27 | 27 | 40 |
| 10.5 | 8.5 | 42.5 | 27.5 | 27.5 | 41 |
| 11 | 9 | 43 | 28 | 28 | 42 |
| 12 | 10 | 44 | 29 | 29 | 43 |
- On prints no foot length on this chart. Japan sizes are in centimetres.
- Blank cells: On prints no Brazil size for these US sizes.
Source: On (on.com, 2 pages), read 10 October 2026.
Common questions
What is an On EU 42 in US sizes?
In On men's shoes, an EU 42 is a US 8.5 and a UK 8. In On women's shoes, an EU 42 is a US 10 and a UK 8.
Do On shoes run small?
On's own pages for the Cloudtilt and Cloudrunner 3 Max say true to size. For running, On says go at least half a size above your street shoe.
Shop On
Other size charts
Sources
- On: Men's shoe size guide on the Cloudtilt page: US, UK, EU, Japan, Mexico and Brazil sizes, and the fit line. on.com, read 10 October 2026.
- On: Women's shoe size guide on the Cloudrunner 3 Max page: US, UK, EU, Japan, Mexico and Brazil sizes, and the fit line. on.com, read 10 October 2026.
- On: On's sizing questions page: women's and men's sizes, width, and running shoe fit. on.com, read 10 October 2026.