Onitsuka Tiger to Birkenstock shoe size
The short answer
Onitsuka Tiger 22.5 is Birkenstock 36 by the two brands' own charts.
At least one of the two brands publishes no foot length, so the rows line up the US size both charts print. Treat it as the label conversion, not a fit.
| Onitsuka Tiger | Onitsuka Tiger builds it for | Birkenstock, by chart | Same label | Birkenstock builds it for | Birkenstock also prints |
|---|---|---|---|---|---|
| 22 | not published | 35 | not published | not published | not published |
| 22.5 | not published | 36 | not published | not published | not published |
| 23 | not published | 37 | not published | not published | not published |
| 23.5 | not published | 37 | not published | not published | not published |
| 24 | not published | 38 | not published | not published | not published |
| 24.5 | not published | 38 | not published | not published | not published |
| 25 | not published | 39 | not published | not published | not published |
| 25.5 | not published | 40 | not published | not published | not published |
| 26 | not published | 40 | not published | not published | not published |
| 26.5 | not published | 41 | not published | not published | not published |
| 27 | not published | 41 | not published | not published | not published |
| 27.5 | not published | 42 | not published | not published | not published |
| 28 | not published | 42 | not published | not published | not published |
| 28.5 | not published | 43 | not published | not published | not published |
| 29 | not published | 44 | not published | not published | not published |
| 29.5 | not published | 44 | not published | not published | not published |
| 30 | not published | 44 or 48 | not published | not published | not published |
| 30.5 | not published | 48 or 44 | not published | not published | not published |
What wearers say
Charts describe a garment. People who own both brands describe a fit, and their answer ranks above this table once five of them stand behind it. Pick your size in the converter to see whether there are enough yet.
Sources
- Onitsuka Tiger size guide, read on 2026-09-18. Onitsuka Tiger on TrueToSize
- Birkenstock size guide, read on 2026-09-18.