Nike to ASICS men's shoe size
The short answer
Nike 3.5 is ASICS 4 by the two brands' own charts. 5 of 27 Nike sizes land on a different label at ASICS.
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.
| Nike | Nike builds it for | ASICS, by chart | Same label | ASICS builds it for | ASICS also prints |
|---|---|---|---|---|---|
| 3.5 | not published | 4 | not published | not published | US women's 5.5 · UK 3 · EU 36 · CM / JP 22.5 |
| 4 | not published | 4 | not published | not published | US women's 5.5 · UK 3 · EU 36 · CM / JP 22.5 |
| 4.5 | not published | 4 or 5 | not published | not published | US women's 5.5 · UK 3 · EU 36 · CM / JP 22.5 |
| 5 | not published | 5 | not published | not published | US women's 6.5 · UK 4 · EU 37.5 · CM / JP 23.5 |
| 5.5 | not published | 5.5 | not published | not published | US women's 7 · UK 4.5 · EU 38 · CM / JP 24 |
| 6 | not published | 6 | not published | not published | US women's 7.5 · UK 5 · EU 39 · CM / JP 24.5 |
| 6.5 | not published | 6.5 | not published | not published | US women's 8 · UK 5.5 · EU 39.5 · CM / JP 25 |
| 7 | not published | 7 | not published | not published | US women's 8.5 · UK 6 · EU 40 · CM / JP 25.5 |
| 7.5 | not published | 7.5 | not published | not published | US women's 9 · UK 6.5 · EU 40.5 · CM / JP 25.75 |
| 8 | not published | 8 | not published | not published | US women's 9.5 · UK 7 · EU 41.5 · CM / JP 26 |
| 8.5 | not published | 8.5 | not published | not published | US women's 10 · UK 7.5 · EU 42 · CM / JP 26.5 |
| 9 | not published | 9 | not published | not published | US women's 10.5 · UK 8 · EU 42.5 · CM / JP 27 |
| 9.5 | not published | 9.5 | not published | not published | US women's 11 · UK 8.5 · EU 43.5 · CM / JP 27.5 |
| 10 | not published | 10 | not published | not published | US women's 11.5 · UK 9 · EU 44 · CM / JP 28 |
| 10.5 | not published | 10.5 | not published | not published | US women's 12 · UK 9.5 · EU 44.5 · CM / JP 28.25 |
| 11 | not published | 11 | not published | not published | US women's 12.5 · UK 10 · EU 45 · CM / JP 28.5 |
| 11.5 | not published | 11.5 | not published | not published | US women's 13 · UK 10.5 · EU 46 · CM / JP 29 |
| 12 | not published | 12 | not published | not published | US women's 13.5 · UK 11 · EU 46.5 · CM / JP 29.5 |
| 12.5 | not published | 12.5 | not published | not published | US women's 14 · UK 11.5 · EU 47 · CM / JP 30 |
| 13 | not published | 13 | not published | not published | US women's 14.5 · UK 12 · EU 48 · CM / JP 30.5 |
| 13.5 | not published | 13.5 | not published | not published | US women's 15 · UK 12.5 · EU 48.5 · CM / JP 30.75 |
| 14 | not published | 14 | not published | not published | US women's 15.5 · UK 13 · EU 49 · CM / JP 31 |
| 14.5 | not published | 14 or 15 | not published | not published | US women's 15.5 · UK 13 · EU 49 · CM / JP 31 |
| 15 | not published | 15 | not published | not published | US women's 16.5 · UK 14 · EU 50.5 · CM / JP 32 |
| 15.5 | not published | 15 or 16 | not published | not published | US women's 16.5 · UK 14 · EU 50.5 · CM / JP 32 |
| 16 | not published | 16 | not published | not published | US women's 17.5 · UK 15 · EU 51.5 · CM / JP 33 |
| 16.5 | not published | 16 | not published | not published | US women's 17.5 · UK 15 · EU 51.5 · CM / JP 33 |
| 17 | not published | not made | not published | not published | not published |
| 17.5 | not published | not made | not published | not published | not published |
| 18 | not published | not made | not published | not published | not published |
| 18.5 | not published | not made | not published | not published | not published |
| 19 | not published | not made | not published | not published | not published |
| 19.5 | not published | not made | not published | not published | not published |
| 20 | not published | not made | not published | not published | not published |
| 20.5 | not published | not made | not published | not published | not published |
| 21 | not published | not made | not published | not published | not published |
| 21.5 | not published | not made | not published | not published | not published |
| 22 | not published | not made | not published | not published | not published |
What wearers say
Charts describe a garment, not a fit. We do not collect fit reports for this category yet, so this table is the two brands' own claims and nothing more.
Sources
- Nike size guide, read on 2026-09-18. Nike on TrueToSize
- ASICS size guide, read on 2026-09-18. ASICS on TrueToSize