Universal Hat Size Chart
Universal adult hat size chart: match head circumference in inches or cm to US fitted fractions (7 1/4), UK, EU, and letter sizes.
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| US Alpha | US Fitted | UK Fitted | EU | Head (in) | Head (cm) |
|---|---|---|---|---|---|
| XS | 6 1/2 | 6 3/8 | 52 | 20.5" | 52 |
| XS | 6 5/8 | 6 1/2 | 53 | 20.875" | 53 |
| S | 6 3/4 | 6 5/8 | 54 | 21.25" | 54 |
| S | 6 7/8 | 6 3/4 | 55 | 21.625" | 55 |
| M | 7 | 6 7/8 | 56 | 22" | 56 |
| M | 7 1/8 | 7 | 57 | 22.375" | 57 |
| L | 7 1/4 | 7 1/8 | 58 | 22.75" | 58 |
| L | 7 3/8 | 7 1/4 | 59 | 23.125" | 59 |
| XL | 7 1/2 | 7 3/8 | 60 | 23.5" | 60 |
| XL | 7 5/8 | 7 1/2 | 61 | 23.875" | 61 |
| XXL | 7 3/4 | 7 5/8 | 62 | 24.25" | 62 |
| XXL | 7 7/8 | 7 3/4 | 63 | 24.625" | 63 |
| XXXL | 8 | 7 7/8 | 64 | 25" | 64 |
How to use this generic hat sizes chart
- Measure your head about 1/8" above the ears; note inches or cm.
- Find the circumference in the Head (in) or Head (cm) column.
- Read across for US fitted, UK, EU, and letter size on the same row.
- Between sizes? Size up for rigid fitted and cowboy hats.
How to read this chart
US Fitted: Fraction sizes (e.g. 7 1/4) matched to head circumference in inches—common on fitted baseball caps.
UK Fitted / EU: Parallel systems; EU often tracks cm closely.
Head (in/cm): Your measured circumference—the most reliable input for hat size conversion.