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