Find your hat size by measuring the circumference of your head. Wrap a soft tape measure around the widest part, about a finger width above your ears and eyebrows, keeping it level all the way around. Enter that measurement in centimeters or inches and this tool returns your fitted US hat size, the UK size, the European size in centimeters and a simple small to extra large alpha size. Fitted hats use the US scale where the size is the head circumference in inches divided by pi, while European makers just label the centimeter measurement directly, which is why the numbers look so different. If you land between two sizes, choose the larger and use a sizing band for a snug fit. The calculation runs entirely in your browser with nothing sent anywhere, and the sizes update instantly as you adjust the measurement.
Find your hat size by measuring the circumference of your head. Wrap a soft tape measure around the widest part, about a finger width above your ears and eyebrows, keeping it level all the way around.
Yes. Hat Size Calculator is completely free, with no sign-up and no usage limits.
Yes. Hat Size Calculator runs in any modern web browser. There is nothing to download or install.
Yes. Hat Size Calculator runs entirely on your device in your browser, so nothing you enter is uploaded to a server.