File & Format Converters · Free tool
Hat Size Converter
Hat size US fractional ↔ UK ↔ EU ↔ letter (XS-XXL). Head circumference in cm.
Use a soft tape (or wrap a string and measure on a ruler). Place it about 1 cm above your ears and just above your brow — where a hat normally sits. Hold it level and snug, not tight. Measure twice and take the larger of the two.
| US | UK | EU (cm) | Letter |
|---|---|---|---|
| 6 1/2 | 6 3/8 | 52 | XS |
| 6 5/8 | 6 1/2 | 53 | XS |
| 6 3/4 | 6 5/8 | 54 | S |
| 6 7/8 | 6 3/4 | 55 | S |
| 7 | 6 7/8 | 56 | M |
| 7 1/8 | 7 | 57 | M |
| 7 1/4 | 7 1/8 | 58 | L |
| 7 3/8 | 7 1/4 | 59 | XL |
| 7 1/2 | 7 3/8 | 60 | XL |
| 7 5/8 | 7 1/2 | 61 | XXL |
| 7 3/4 | 7 5/8 | 62 | XXL |
| 7 7/8 | 7 3/4 | 63 | 3XL |
| 8 | 7 7/8 | 64 | 3XL |
Between sizes? Wool felt hats stretch up to ~1 cm — size down. Straw hats don’t stretch — size up. Fitted caps (New Era 59FIFTY etc.) run true to US fractional sizes.
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What it does
US 7 fits a 56cm head — but is that S, M, or L? This maps all four systems with the string-and-ruler measurement technique.
Runs entirely in your browser — no upload, no account, no watermark. For more tools in this category see the full tools index.
Embed this tool on your siteShow snippetHide
Paste this snippet into any page. Loads on-demand (lazy), no tracking scripts, and sized to most dashboards. Replace the height to fit your layout.
<iframe src="https://freetoolarena.com/embed/hat-size-converter" width="100%" height="720" frameborder="0" loading="lazy" title="Hat Size Converter" style="border:1px solid #e2e8f0;border-radius:12px;max-width:720px;"></iframe>How to use it
- Measure head in cm.
- Or enter a size.
- Read all systems.
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