Hat Size Converter
Convert head circumference in centimeters or inches to US, UK, EU, and alpha hat sizes. Use it before ordering a fitted cap, cowboy hat, fedora, helmet-style liner, or any hat that needs a snug measurement.
Convert your hat size
Enter the measurement you know. The nearest hat sizes update instantly.
A 58 cm head circumference is closest to US/UK 7 1/4 and usually falls around Medium to Large, depending on the brand.
How to measure your head for a hat
- Use a soft tape measure around the widest part of your head.
- Keep the tape about 1/2 inch above your eyebrows and ears, where the hat will sit.
- Measure in centimeters if possible, then compare to the nearest size.
- If you are between sizes, choose the larger size for fitted hats that do not stretch.
Quick hat size chart
| CM | Inches | US/UK | Alpha |
|---|
Hat size conversion FAQ
What does a 58 cm hat size convert to?
A 58 cm hat is about 22.8 inches around the head and is usually closest to US/UK size 7 1/4. Many brands place it near Medium or Large.
How do alpha hat sizes like S, M, and L work?
Alpha sizes are ranges, not exact measurements. A Medium might cover about 56–57 cm at one brand and 57–58 cm at another, so use the exact chart when you can.
Can I convert inches to fitted hat size?
Yes. Enter your head circumference in inches and the converter estimates the closest fitted hat size, plus centimeters and EU size.