Everyday life

Hat Size Calculator

Find hat size from head circumference.

Calculated Output

US hat size 7.003

Circumference 55.88

Formula: hat size = circumference (in) ÷ π

Step-by-Step Breakdown

1. Values used:

2. Head circumference = 22

4. US hat size = 7.003

5. Circumference = 55.88

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The math behind it

hat size = head circumference (in) ÷ π (i.e. the diameter in inches).

22 in head → ~size 7.

Measure where?

Around the head about 1 inch above the ears and eyebrows.