Online Tool Store
Hat Size Converter
Convert a head measurement between centimeters, inches, US fitted, UK, and international hat sizes with a clear size guide in your browser.
🔒 This tool runs entirely in your browser. Your files are never uploaded to a server.
Head measurement
Find your hat size
Measure around the widest part of your head, roughly one finger above the eyebrows and ears.
Fit tip
If you are between sizes, check the brand's own sizing guide or choose the adjustable option when available.
Centimeters
57 cm
Inches
22.4 in
US fitted size
7 ⅛
International
M
How to convert a hat size
- Measure your head circumference in centimeters or inches.
- Enter the measurement and review the equivalent fitted size.
- Compare it with the retailer's brand-specific fit chart before ordering.
FAQ
How do I measure my head for a hat?
Use a flexible tape around the widest part of your head, above the eyebrows and ears. Keep it level and comfortably snug.
Why might a brand size differ?
Hat makers use different blocks, materials, and fit preferences, so treat the conversion as a helpful starting point and check the specific brand chart.
Does the measurement leave my browser?
No. This conversion is calculated entirely in the current browser tab.
How we compare
| Feature | Online Tool Store | Retailer size chart | In-store fitting |
|---|---|---|---|
| Multiple size systems | Shown together | Usually one system | Label-dependent |
| Instant calculation | Yes | Manual lookup | Try on |
| Brand-specific fit | General guide | Often included | Best option |
Use this tool to translate a measurement quickly, then prioritize a brand's own size chart for the final purchase decision.