On size chart
On’s own size charts cover men’s 7–15, women’s 5–12, unisex W5 / M3.5–W15.5 / M14, toddler 4–10, little kid 10.5K–3K, big kid 3.5Y–6.5Y.
On gives foot lengths on 3 of its 6 charts; the others match through their printed US, UK and EU sizes.
On’s charts at a glance
Does On run big or small?
On doesn’t publish foot lengths for its adult sizes, so its chart can’t say whether it runs big or small: its sizes match by the US, UK and EU sizes it prints. Size from your foot length, then check the brand’s own chart.
On men’s size chart
| US | UK | EU | JP | MX | BR |
|---|---|---|---|---|---|
| 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 |
As printed on On’s chart on on.com (checked 2026-10-21).
On women’s size chart
| US | UK | EU | JP | MX | BR |
|---|---|---|---|---|---|
| 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 |
As printed on On’s chart on on.com (checked 2026-10-21).
On unisex size chart
| US | UK | EU | JP | MX | BR |
|---|---|---|---|---|---|
| W5 / M3.5 | 3 | 36 | W22 | W22 | — |
| W5.5 / M4 | 3.5 | 36.5 | W22.5 | W22.5 | W34 / M33 |
| W6 / M4.5 | 4 | 37 | W23 | W23 | W34.5 / M33.5 |
| W6.5 / M5 | 4.5 | 37.5 | W23.5 | W23.5 | W35 / M34.5 |
| W7 / M5.5 | 5 | 38 | W24 | W24 | W36 / M35 |
| W7.5 / M6 | 5.5 | 38.5 | W24.5 | W24.5 | W37 / M36 |
| W8 / M6.5 | 6 | 39 | W25 | W25 | W37.5 / M36.5 |
| W8.5 / M7 | 6.5 | 40 | M25 / W25.5 | M25 / W25.5 | W38 / M37 |
| W9 / M7.5 | 7 | 40.5 | M25.5 / W26 | M25.5 / W26 | W39 / M38 |
| W9.5 / M8 | 7.5 | 41 | M26 / W26.5 | M26 / W26.5 | W39.5 / M39 |
| W10 / M8.5 | 8 | 42 | M26.5 / W27 | M26.5 / W27 | W40 / M39.5 |
| W10.5 / M9 | 8.5 | 42.5 | M27 / W27.5 | M27 / W27.5 | W41 / M40 |
| W11 / M9.5 | 9 | 43 | M27.5 / W28 | M27.5 / W28 | W42 / M41 |
| W11.5 / M10 | 9.5 | 44 | M28 | M28 | W42.5 / M41.5 |
| W12 / M10.5 | 10 | 44.5 | M28.5 | M28.5 | W43 / M42 |
| W12.5 / M11 | 10.5 | 45 | M29 | M29 | W43.5 / M42.5 |
| W13 / M11.5 | 11 | 46 | M29.5 | M29.5 | W44 / M43 |
| W13.5 / M12 | 11.5 | 47 | M30 | M30 | W45 / M44 |
| W14 / M12.5 | 12 | 47.5 | M30.5 | M30.5 | W46 / M45 |
| W14.5 / M13 | 12.5 | 48 | M31 | M31 | W47 / M46 |
| W15.5 / M14 | 13.5 | 49 | M31.5 | M31.5 | W48 / M47 |
As printed on On’s chart on on.com (checked 2026-10-21).
On toddler size chart
| US | UK | EU | JP | CM | MX | BR | Foot |
|---|---|---|---|---|---|---|---|
| 4 | 3.5 | 19.5 | 11.4 | 11.4 | 11.4 | 18.5 | 11.4 cm4.5 in |
| 5 | 4.5 | 21 | 12.3 | 12.3 | 12.3 | 20 | 12.3 cm4.8 in |
| 6 | 5.5 | 22 | 13.1 | 13.1 | 13.1 | 21 | 13.1 cm5.2 in |
| 7 | 6.5 | 23.5 | 14 | 14 | 14 | 22.5 | 14.0 cm5.5 in |
| 8 | 7.5 | 25 | 14.8 | 14.8 | 14.8 | 24 | 14.8 cm5.8 in |
| 9 | 8.5 | 26 | 15.4 | 15.4 | 15.4 | 25 | 15.4 cm6.1 in |
| 10 | 9.5 | 27 | 16.3 | 16.3 | 16.3 | 25.5 | 16.3 cm6.4 in |
As printed on On’s chart on on.com (checked 2026-10-21). Foot is the foot length the brand gives for the size (the top of the range where it prints one).
On little kid size chart
| US | UK | EU | JP | CM | MX | BR | Foot |
|---|---|---|---|---|---|---|---|
| 10.5K | 10K | 27.5 | 16.7 | 16.7 | 16.7 | 25.5 | 16.7 cm6.6 in |
| 11K | 10.5K | 28.5 | 17.1 | 17.1 | 17.1 | 26.5 | 17.1 cm6.7 in |
| 11.5K | 11K | 29 | 17.6 | 17.6 | 17.6 | 27 | 17.6 cm6.9 in |
| 12K | 11.5K | 29.5 | 18 | 18 | 18 | 27.5 | 18.0 cm7.1 in |
| 12.5K | 12K | 30 | 18.4 | 18.4 | 18.4 | 28 | 18.4 cm7.2 in |
| 13K | 12.5K | 31 | 18.8 | 18.8 | 18.8 | 29 | 18.8 cm7.4 in |
| 13.5K | 13K | 31.5 | 19.2 | 19.2 | 19.2 | 29.5 | 19.2 cm7.6 in |
| 1K | 13.5K | 32 | 19.7 | 19.7 | 19.7 | 30 | 19.7 cm7.8 in |
| 1.5K | 1K | 33 | 20.1 | 20.1 | 20.1 | 31 | 20.1 cm7.9 in |
| 2K | 1.5K | 33.5 | 20.5 | 20.5 | 20.5 | 31.5 | 20.5 cm8.1 in |
| 2.5K | 2K | 34 | 20.9 | 20.9 | 20.9 | 32 | 20.9 cm8.2 in |
| 3K | 2.5K | 35 | 21.4 | 21.4 | 21.4 | 33 | 21.4 cm8.4 in |
As printed on On’s chart on on.com (checked 2026-10-21). Foot is the foot length the brand gives for the size (the top of the range where it prints one).
On big kid size chart
| US | UK | EU | JP | CM | MX | BR | Foot |
|---|---|---|---|---|---|---|---|
| 3.5Y | 3Y | 35.5 | 21.6 | 21.6 | 21.6 | 33.5 | 21.6 cm8.5 in |
| 4Y | 3.5Y | 36 | 22 | 22 | 22 | 34 | 22.0 cm8.7 in |
| 4.5Y | 4Y | 36.5 | 22.4 | 22.4 | 22.4 | 34.5 | 22.4 cm8.8 in |
| 5Y | 4.5Y | 37.5 | 22.9 | 22.9 | 22.9 | 35.5 | 22.9 cm9 in |
| 5.5Y | 5Y | 38 | 23.3 | 23.3 | 23.3 | 36 | 23.3 cm9.2 in |
| 6Y | 5.5Y | 38.5 | 23.7 | 23.7 | 23.7 | 36.5 | 23.7 cm9.3 in |
| 6.5Y | 6Y | 39 | 24.1 | 24.1 | 24.1 | 37 | 24.1 cm9.5 in |
As printed on On’s chart on on.com (checked 2026-10-21). Foot is the foot length the brand gives for the size (the top of the range where it prints one).
Find your On size from your foot length
shoesize.app is not affiliated with On. On’s name is used only to identify its own size charts, linked above. An estimate to help you choose: fit varies by model. Not medical advice.