Is On true to size?

On true to size for most buyers: 72% report a true fit, 12% find it small, and 16% find it large (confidence 70%). Model-level fit can differ — this is the brand-level aggregate from our sourced data.

Best fit recommendation for On

For a 271 mm foot, On fits true to size. Best fit: US 10 (likely US 9–11), UK 9, EU 41, 27 cm — confidence 70%.

Recommended size for a 271 mm foot on On (best fit + range, not a guarantee)
Best fit Likely range UK EU CM Confidence
US 10 US 9–11 9 41 27 70%

Evidence: 2 sources · no lab measurement in this record

See how we calculate for the methodology. Sizes vary by model and foot shape; this is an estimate, not a guarantee.

What size should I start with in On?

Start by checking your usual US size in On for a typical fit. See the full On sizing guide or size chart.

Reference sizes at 271 mm foot length
US Men UK EU CM
10 9 41 27

Does On run small or large?

Our fit offset for On is 0 size steps (negative = runs small). Compare with all brands ranked by fit.