Every On conversion below is verified against the brand's official size chart.
On fit — the short version
True to size in a narrow-to-medium fit; wide feet may want more room. In waterproof models, go up half a size.
Men's size conversions
US 7 — women's US 8.5, EU 40, UK 6.5, Japan 25, Korea 25
US 7.5 — women's US 9, EU 40.5, UK 7, Japan 25.5, Korea 25.5
US 8 — women's US 9.5, EU 41, UK 7.5, Japan 26, Korea 26
US 8.5 — women's US 10, EU 42, UK 8, Japan 26.5, Korea 26.5
US 9 — women's US 10.5, EU 42.5, UK 8.5, Japan 27, Korea 27
US 9.5 — women's US 11, EU 43, UK 9, Japan 27.5, Korea 27.5
US 10 — women's US 11.5, EU 44, UK 9.5, Japan 28, Korea 28
US 10.5 — women's US 12, EU 44.5, UK 10, Japan 28.5, Korea 28.5
US 11 — women's US 12.5, EU 45, UK 10.5, Japan 29, Korea 29
US 11.5 — women's US 13, EU 46, UK 11, Japan 29.5, Korea 29.5
US 12 — women's US 13.5, EU 47, UK 11.5, Japan 30, Korea 30
US 12.5 — women's US 14, EU 47.5, UK 12, Japan 30.5, Korea 30.5
US 13 — women's US 14.5, EU 48, UK 12.5, Japan 31, Korea 31
US 14 — women's US 15.5, EU 49, UK 13.5, Japan 31.5, Korea 31.5
Women's size conversions
US 5 — men's US 3.5, EU 36, UK 3, Japan 22, Korea 22
US 5.5 — men's US 4, EU 36.5, UK 3.5, Japan 22.5, Korea 22.5
US 6 — men's US 4.5, EU 37, UK 4, Japan 23, Korea 23
US 6.5 — men's US 5, EU 37.5, UK 4.5, Japan 23.5, Korea 23.5
US 7 — men's US 5.5, EU 38, UK 5, Japan 24, Korea 24
US 7.5 — men's US 6, EU 38.5, UK 5.5, Japan 24.5, Korea 24.5
US 8 — men's US 6.5, EU 39, UK 6, Japan 25, Korea 25
US 8.5 — men's US 7, EU 40, UK 6.5, Japan 25.5, Korea 25.5
US 9 — men's US 7.5, EU 40.5, UK 7, Japan 26, Korea 26
US 9.5 — men's US 8, EU 41, UK 7.5, Japan 26.5, Korea 26.5
US 10 — men's US 8.5, EU 42, UK 8, Japan 27, Korea 27
US 10.5 — men's US 9, EU 42.5, UK 8.5, Japan 27.5, Korea 27.5
US 11 — men's US 9.5, EU 43, UK 9, Japan 28, Korea 28
If you normally wear another brand
Anchored on your ASICS size:
- Asics: Baseline — true to size. One of the roomier toeboxes in running; wide widths on core models.
- On: Same size. Narrow-to-medium fit; go up half in waterproof models.
- HOKA: Half size up. Runs about a half size short of Asics, with a snug, tapered toebox.
- Adidas: Same size; half up for wide feet. Race lines run long and narrow.
- Salomon: Half size up in Speedcross. European last — narrow and precise; Sense Ride fits truer.
- norda: Half size up in 001 and 005; full size up in 002 and 003. The brand's own guidance — follow it.
Common questions
Does On run true to size? Yes — On fits true to size in a narrow-to-medium fit, so keep your usual running-shoe size. Wide feet may want more room.
Should I size up in waterproof On shoes? Yes. In waterproof models, go up half a size from your usual On size.
You will also find these charts on every On product page on enroute.run, right beside the shoe you are looking at.