Hat Size Calculator
From Inches
in
From Centimeters
cm
Formula
Fitted size = head circumference (inches) / π | Generic sizing based on circumference ranges
Frequently Asked Questions
How do I measure my hat size?
Use a flexible tape measure around the widest part of your head, about 1 inch (2.5 cm) above your eyebrows and ears. The measurement in inches divided by pi gives your fitted hat size.
What is the average hat size?
The average men's hat size is about 7 1/8 to 7 1/4 (head circumference 22.25–22.75 inches / 56.5–57.8 cm). The average women's hat size is about 7 to 7 1/8.
What do S, M, L hat sizes mean?
S (Small) ≈ 6 7/8 (21.5–21.75"), M (Medium) ≈ 7–7 1/8 (22–22.25"), L (Large) ≈ 7 1/4–7 3/8 (22.5–22.75"), XL ≈ 7 1/2–7 5/8 (23–23.25").
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