Sizing tool
Hat Size Chart in CM
Match measured head circumference to the nearest centimeter row.
| Head circumference | Letter size (brand-dependent) | Fitted reference |
|---|---|---|
| 54.9 cm / 21.6 in | S | 6 7/8 |
| 55.8 cm / 22.0 in | S–M | 7 |
| 56.8 cm / 22.4 in | M | 7 1/8 |
| 57.7 cm / 22.7 in | M | 7 1/4 |
| 58.7 cm / 23.1 in | L | 7 3/8 |
| 59.6 cm / 23.5 in | L | 7 1/2 |
| 60.6 cm / 23.9 in | XL | 7 5/8 |
| 61.5 cm / 24.2 in | XL | 7 3/4 |
Read the chart from centimeters first
Measure head circumference in centimeters at the position where the hat will sit, then use the nearest row to read the fitted and letter-size references.
Avoid converting from an old hat label if you can measure the head directly; the circumference is the more portable value.
Method & references
How this guidance is checked
These sources support the measurement method and help check real-world variation. They are not presented as one universal brand-size table.
- New Era Fitted Caps Size Chart — New Era. Fitted-cap circumference cross-check and evidence that label CM values can differ from measured head circumference.
- Men Size Guide — H&M. Cross-check for men’s EU/US clothing, chest and waist ranges, trousers, jackets, and suit-style numeric references.
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