Reef Size Chart
Men's
| US | UK | EUR | JAPAN (cm) |
| 4 | 3 | 35 | 22 |
| 5 | 4 | 36 | 23 |
| 6 | 5 | 37.5 | 24 |
| 7 | 6 | 39 | 25 |
| 7.5 | 6.5 | 39.5 | 25.5 |
| 8 | 7 | 40 | 26 |
| 8.5 | 7.5 | 41 | 26.5 |
| 9 | 8 | 42 | 27 |
| 9.5 | 8.5 | 42.5 | 27.5 |
| 10 | 9 | 43 | 28 |
| 10.5 | 9.5 | 43.5 | 28.5 |
| 11 | 10 | 44 | 29 |
| 11.5 | 10.5 | 44.5 | 29.5 |
| 12 | 11 | 45 | 30 |
| 13 | 12 | 46 | 31 |
| 14 | 13 | 47 | 32 |
| 15 | 14 | 48 | 33 |
| 16 | 15 | 49 | 34 |
| 17 | 16 | 50 | 35 |
Women's
| US | UK | EUR | JAPAN (cm) |
| 4 | 2 | 34 | 21 |
| 5 | 3 | 35 | 22 |
| 6 | 4 | 36 | 23 |
| 6.5 | 4.5 | 37 | 23.5 |
| 7 | 5 | 37.5 | 24 |
| 7.5 | 5.5 | 38 | 24.5 |
| 8 | 6 | 38.5 | 25 |
| 8.5 | 6.5 | 39 | 25.5 |
| 9 | 7 | 40 | 26 |
| 9.5 | 7.5 | 40.5 | 26.5 |
| 10 | 8 | 41 | 27 |
| 11 | 9 | 42.5 | 28 |
Youth - Approximate Age: 9 Months to 5 Years
| US Sizes | UK | EUR | JAPAN (cm) |
| 3/4 | 2/3 | 19/20 | 11 |
| 5/6 | 4/5 | 21/22 | 12.5 |
| 7/8 | 6/7 | 23/24 | 14.5 |
| 9/10 | 8/9 | 25/26 | 16 |
Youth - Approximate Age: 6 to 11 Years
| US Sizes | UK | EUR | JAPAN (cm) |
| 11/12 | 10/11 | 28/29 | 18 |
| 13/1 | 12/13 | 31/32 | 20 |
| 2/3 | 1/2 | 33/34 | 22 |
| 4/5 | 3/4 | 35/36 | 24 |
| 6/7 | 5/6 | 37/38 | 26 |