OnceHesap

Hat Size Calculator

Find your hat size from one head measurement.

How to use

  1. Enter your values in the fields above.
  2. Press Calculate to see your result instantly.
  3. Use the Share button to copy a link to your result.

About this calculator

Hat sizing is based on head circumference measured around the widest part of the head (above the ears and eyebrows), but different regions express that measurement differently — the US traditionally uses a size derived by dividing the circumference in inches by pi (roughly matching sizes like 7 or 7 1/8), while UK and EU sizing is often given directly in centimeters or as S/M/L/XL bands.

This calculator converts a single head circumference measurement into the equivalent US and EU hat sizes, so you can shop confidently across brands that use different sizing systems.

Was this helpful?

Comments (0)

  • Be the first to comment.

Popular calculators

Loan Calculator

Monthly payment, total interest and full amortization schedule.

Percentage Calculator

Percent change, percent of, and ratio calculations.

Discount Calculator

Calculate final price, savings, and discount amount.

BMI Calculator

Body mass index from height and weight (metric or imperial).

Age Calculator

Compute your exact age in years, months and days from a birth date.

Compound Interest Calculator

Calculate the final amount and interest earned with compounding.

All Calculators