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ASICS to On Shoe Size Conversion
Switching from ASICS to On? ASICS runs true to size and On runs true to size, so the size you order changes. Here's the full chart.
Because ASICS and On share the same fit tendency, your size carries straight across: a ASICS 9 is a On 9.
ASICS and On run the same
Order the same number — a ASICS 9 is a On 9.
Find your ASICS size on the left, read across for On:
| ASICS size | On size | UK | EU | Foot (cm) |
|---|---|---|---|---|
| 6.5 | 6.5 | 5.5 | 37 | 23.5 |
| 7 | 7 | 6 | 38 | 24.3 |
| 7.5 | 7.5 | 6.5 | 38.5 | 24.7 |
| 8 | 8 | 7 | 39.5 | 25.1 |
| 8.5 | 8.5 | 7.5 | 41 | 25.9 |
| 9 | 9 | 8 | 41.5 | 26.3 |
| 9.5 | 9.5 | 8.5 | 42.5 | 26.7 |
| 10 | 10 | 9 | 43 | 27.1 |
| 10.5 | 10.5 | 9.5 | 43.5 | 27.5 |
| 11 | 11 | 10 | 44 | 27.9 |
| 11.5 | 11.5 | 10.5 | 44.5 | 28.3 |
| 12 | 12 | 11 | 45.5 | 28.7 |
| 12.5 | 12.5 | 11.5 | 46 | 29.1 |
| 13 | 13 | 12 | 47 | 29.5 |
| 13.5 | 13.5 | 12.5 | 47.5 | 29.9 |
| 14 | 14 | 13 | 48 | 30.3 |
| 14.5 | 14.5 | 13.5 | 49 | 31.1 |
| 15 | 15 | 14 | 49.5 | 31.5 |
⚠️ Fit varies by model. ASICS runs true to size with a roomy toe box; wide fittings are widely available. On (On Running) runs true to size for most, with a snug, performance fit.
On to ASICS → · ASICS chart · On chart · Brand finder
What is a ASICS 9 in On?
A ASICS 9 is about a On 9 — they share a foot length of roughly 26.3 cm (UK 8, EU 41.5).
Do ASICS and On fit the same?
Roughly, yes — both run true to size, so the same number fits.
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