| American | Nearest 1/8 inch | Metric | Size Code |
| 6 5/8 | 20 1/4 | 53 | X-Small |
| 6 3/4 | 21 1/8 | 54 | Small |
| 6 7/8 | 21 1/2 | 55 | Small |
| 7 | 21 7/8 | 56 | Medium |
| 7 1/8 | 22 1/4 | 57 | Medium |
| 7 1/4 | 22 5/8 | 58 | Large |
| 7 3/8 | 23 | 59 | Large |
| 7 1/2 | 23 1/2 | 60 | X-Large |
| 7 5/8 | 23 7/8 | 61 | X-Large |
| 7 3/4 | 24 1/4 | 62 | XX-Large |
| 7 7/8 | 24 5/8 | 63 | XX-Large |
| 8 | 25 | 64 |
* The above information comes from "The 1996 Hat Life Directory" published by Hat Life Publications.
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This page last modified:04/09/00