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On to ASICS Shoe Size Conversion
Switching from On to ASICS? On runs true to size and ASICS runs true to size, so the size you order changes. Here's the full chart.
Because On and ASICS share the same fit tendency, your size carries straight across: a On 9 is a ASICS 9.
On and ASICS run the same
Order the same number — a On 9 is a ASICS 9.
Find your On size on the left, read across for ASICS:
| On size | ASICS 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. On (On Running) runs true to size for most, with a snug, performance fit. ASICS runs true to size with a roomy toe box; wide fittings are widely available.
ASICS to On → · On chart · ASICS chart · Brand finder
What is a On 9 in ASICS?
A On 9 is about a ASICS 9 — they share a foot length of roughly 26.3 cm (UK 8, EU 41.5).
Do On and ASICS fit the same?
Roughly, yes — both run true to size, so the same number fits.
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