Hats are measured by the inside circumference at the bottom of the hat's crown (the sweatband) and most often measured in centimeters. While hats may be sized according to their measurement, it is fairly common for women's hats to be sized based on average women's head sizes.

What is the Average Hat Size for Women?

Women's hat sizes are fairly intuitive. Since the average women's head size measures 57cm, a small to medium hat would be made to fit 57cm and then can be adjusted down to 55cm. A large hat size will coordinate with larger head sizes that measure up to 59cm, so a medium to large size hat would be made to fit a 59cm head size and then can be adjusted down to 57cm.

Rhada hats sizes are as follows:

XS/S (55cm) S/M (57cm) M/L (59cm)

What is the Most Common Hat Size?

The most common hat size is a S/M (57cm). While this is the most common hat size, remember that properly sizing your Rhada hat will ensure the best fit.


You will need a string or cloth measuring tape. The goal is to measure where you would usually have a hat sit.


Looking in a mirror, start at the center of your forehead an inch above your eyebrows. Gently wrap the string or cloth tape around your head, a finger width distance above your ears, to the most prominent point in the back of your head. Meet at the starting location in the center of your forehead.


Mark the joint. If you are using a string, measure the start and endpoints. Hat sizing is in cm. If you are in-between sizes, we suggest sizing up and adjusting your hat accordingly.


We recommend measuring three times for accuracy.

For other sizing questions, please visit our FAQ.