Hat Size Calculator

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Calculates your hat size based on your head circumference, providing results in international, American, and British sizing systems.

How To Use

How to use this calculator

Start with your values, or try a preset.

Step 1

Enter Head Circumference in the units shown.

Step 2

Read British Hat Size, American Hat Size, and International Hat Size in the results panel. Results update as you change the inputs.

Step 3

Choose a preset to load an example, then adjust the values for your situation.

Worked Examples

See the inputs and their calculated results.

Head Circumference: 50 cm

British Hat Size: 157 inches; American Hat Size: 19.56 inches; International Hat Size: 50 cm

Head Circumference: 55 cm

British Hat Size: 173 inches; American Hat Size: 21.53 inches; International Hat Size: 55 cm

Head Circumference: 60 cm

British Hat Size: 189 inches; American Hat Size: 23.5 inches; International Hat Size: 60 cm

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