Merrell vs KEEN shoe size
By the length each brand lists, Merrell men's US 9 lines up with KEEN US 9. All 15 men's sizes match the same US number.
Men's sizes
15 of 15 matched men's rows are the same US size. The median length difference is 0 mm on the size in cm scale. Every matched row lists the same length, so any difference below is in the size labels.
| Merrell US | EU | UK | cm | KEEN US | EU | UK | cm | Diff |
|---|---|---|---|---|---|---|---|---|
| 7 | 40 | 6.5 | 25 | 7 | 39.5 | 6 | 25 | 0 |
| 7.5 | 41 | 7 | 25.5 | 7.5 | 40 | 6.5 | 25.5 | 0 |
| 8 | 41.5 | 7.5 | 26 | 8 | 40.5 | 7 | 26 | 0 |
| 8.5 | 42 | 8 | 26.5 | 8.5 | 41 | 7.5 | 26.5 | 0 |
| 9 | 43 | 8.5 | 27 | 9 | 42 | 8 | 27 | 0 |
| 9.5 | 43.5 | 9 | 27.5 | 9.5 | 42.5 | 8.5 | 27.5 | 0 |
| 10 | 44 | 9.5 | 28 | 10 | 43 | 9 | 28 | 0 |
| 10.5 | 44.5 | 10 | 28.5 | 10.5 | 44 | 9.5 | 28.5 | 0 |
| 11 | 45 | 10.5 | 29 | 11 | 44.5 | 10 | 29 | 0 |
| 11.5 | 46 | 11 | 29.5 | 11.5 | 45 | 10.5 | 29.5 | 0 |
| 12 | 46.5 | 11.5 | 30 | 12 | 46 | 11 | 30 | 0 |
| 13 | 48 | 12.5 | 31 | 13 | 47 | 12 | 31 | 0 |
| 14 | 49 | 13 | 32 | 14 | 47.5 | 13 | 32 | 0 |
| 15 | 50 | 14 | 33 | 15 | 48 | 14 | 33 | 0 |
| 16 | 51 | 15 | 34 | 16 | 48.5 | 15 | 34 | 0 |
Sources: Merrell, www.merrell.com (checked 2026-10-24) · KEEN, www.keenfootwear.com (checked 2026-10-24)
Women's sizes
13 of 13 matched women's rows are the same US size. The median length difference is 0 mm on the size in cm scale. Every matched row lists the same length, so any difference below is in the size labels.
| Merrell US | EU | UK | cm | KEEN US | EU | UK | cm | Diff |
|---|---|---|---|---|---|---|---|---|
| 5 | 35 | 2.5 | 22 | 5 | 35 | 2.5 | 22 | 0 |
| 5.5 | 35.5 | 3 | 22.5 | 5.5 | 35.5 | 3 | 22.5 | 0 |
| 6 | 36 | 3.5 | 23 | 6 | 36 | 3.5 | 23 | 0 |
| 6.5 | 37 | 4 | 23.5 | 6.5 | 37 | 4 | 23.5 | 0 |
| 7 | 37.5 | 4.5 | 24 | 7 | 37.5 | 4.5 | 24 | 0 |
| 7.5 | 38 | 5 | 24.5 | 7.5 | 38 | 5 | 24.5 | 0 |
| 8 | 38.5 | 5.5 | 25 | 8 | 38.5 | 5.5 | 25 | 0 |
| 8.5 | 39 | 6 | 25.5 | 8.5 | 39 | 6 | 25.5 | 0 |
| 9 | 40 | 6.5 | 26 | 9 | 39.5 | 6.5 | 26 | 0 |
| 9.5 | 40.5 | 7 | 26.5 | 9.5 | 40 | 7 | 26.5 | 0 |
| 10 | 41 | 7.5 | 27 | 10 | 40.5 | 7.5 | 27 | 0 |
| 10.5 | 42 | 8 | 27.5 | 10.5 | 41 | 8 | 27.5 | 0 |
| 11 | 42.5 | 8.5 | 28 | 11 | 42 | 8.5 | 28 | 0 |
Sources: Merrell, www.merrell.com (checked 2026-10-24) · KEEN, www.keenfootwear.com (checked 2026-10-24)
Convert your exact size
What a chart comparison cannot tell you
Both tables come from brand-wide size charts. They do not capture the shape of a particular model, its width or how it wears. Check the fit notes on the Merrell size chart and the KEEN size chart before you buy.