How To Determine Your Hat Size. The average head size for women is 7 1 ⁄ 4 (u.s. Another valid method to determine hat size is to try on a hat and check the size.
Once you have assembled the hat size tape, measure your hat size. (a cloth tape measure such as a seamstress or tailor uses is ideal.) it is usually helpful to have someone help you. If you don't own a hat, then try on a random hat next time you are visiting a shop that stocks hats.
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Usually, these charts will list the measurements in centimeters and inches. How to measure your head circumference: Pull the tape tight to measure within 1/8. Although it is a matter of personal choice, a good spot to measure is the widest part of your head, as that’s where a hat often fits the best.