How To Measure A Bike Helmet Fit The Right Way

How To Measure A Bike Helmet Fit The Right Way

Bike helmets are essential when doing any kind of riding. While a helmet should always be worn when riding, this doesn’t mean that just any helmet type or size is going to work. In some cases, if the helmet doesn’t fit right, you may as well not even bother wearing one.

Proper fit is crucial in not only making the helmet comfortable, but effective. However, in order for the helmet to fit correctly, you’ll need to first learn how to determine your size by measuring your head.

After that, you can consult a helmet sizing chart to know which one to get.

Measuring your head is a little different than measuring things like arm length and inseam. This quick guide will tell you how to measure your own head, giving you an accurate number you can use to find the right helmet, providing a safe, secure fit.


Measuring your head takes just a few seconds, and requires just a few things.

You’ll need soft measuring tape and a pen, and that’s it.

  • 1. To start, take the measuring tape and wrap it around your head, approximately one inch above your eyebrows and ears. Keep the tape as tight as you can, and mark off on the tape where the two ends meet after forming a circle
  • 2. Most size charts go off of centimeters, so measure the size using them. If your tape only shows inches, convert to centimeters using 1 inch = 2.54 cm.  To be sure, take a few measurements and average them out for a more accurate size
  • 3. If you don’t have measuring tape, but do have a ruler, simply take a piece of string, wrap it around your head using the method above, and then measure the string with your ruler. You’re now ready to consult the size chart, and order the correct helmet


When your new helmet arrives, you’ll need to double check to make sure it fits right

The helmet should be sitting level when on your head, with the front one inch or so above your eyebrows, properly protecting your forehead.

Man with a bike helmet.

You can adjust the fit using the helmet’s retention system until it feels snug. Be mindful of your head’s pressure points too: if it’s uncomfortable in these areas, it may actually be too small. Whether it’s too big or too small, you’ll need to send it back for the right size.


Measuring your head for a proper helmet fit takes just seconds, so there’s no excuse not to. After getting an accurate measurement, you can be confident your new helmet will fit right, making it both comfortable, and safe.

This post was last updated on June 5th, 2018 at 02:10 pm

About the Author Max Shumpert

Over the last few years, I’ve taken my love of the outdoors, hiking, skiing, trekking and exploring to the next level by starting this site. I started a bike shop in Denver, CO, and have seen amazing growth over the last few years. Getting paid to do what I love has been a dream come true for me. That’s also what led me to start In my shop, I spend a large amount of time helping people find the perfect bike for them and the style of biking they’re going to be doing. It only made sense that I expanded my reach and got online, making it possible for me to help people all over the world. If biking and staying fit is your priority, too, you’ve come to the right place.

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