Hat Sizes| Size | Inches | Centimeters | Letter code |
|---|---|---|---|
| 6 | 193/8 | 483 | |
| 61/8 | 193/4 | 492 | |
| 61/4 | 201/8 | 502 | |
| 63/8 | 201/2 | 511 | |
| 61/2 | 207/8 | 521 | XS |
| 65/8 | 211/4 | 530 | |
| 63/4 | 215/8 | 540 | S |
| 67/8 | 22 | 549 | |
| 7 | 223/8 | 559 | M |
| 71/8 | 223/4 | 568 | |
| 71/4 | 231/8 | 578 | L |
| 73/8 | 231/2 | 587 | |
| 71/2 | 237/8 | 597 | XL |
| 75/8 | 241/4 | 606 | |
| 73/4 | 245/8 | 616 | XXL |
| 77/8 | 25 | 625 | |
| 8 | 253/8 | 635 | XXXL |
| 81/8 | 253/4 | 645 | |
| 81/4 | 251/8 | 654 | XXXXL |
| 83/8 | 261/2 | 664 | |
| 81/2 | 267/8 | 673 | XXXXXL |
Childrens hats may display similar letter codes. These are unreliable and will not match adult letter code sizes.
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