How to Measure Bike Helmet Size – Simple Skills That You Can Also Learn


Bicyclists who enjoy riding their bikes know that there are no greater joys than riding them. There is nothing better than riding your bike on a broad road with the wind in your hair and feeling the freedom in your chest. You will crash until you fall. Please don’t deny it! Even the most skilled bicyclists have experienced it. It’s why it is so important to have a fitting helmet. Safety should be your top priority, regardless of your level of skill. A helmet can also improve your riding comfort. Are you having trouble finding the right fit? Don’t worry; we have a detailed guide on how to measure bike helmet size to help you measure your bike helmet to ensure you find the perfect fit. Other pressing questions have been answered. Let’s get started!

How to measure bike helmet size

A tailor’s tape measure or seamstress tape measurement is the best way to measure a bike helmet size. Another way to measure your head is to use a non-elastic string/cord to wrap around it and then lay the line alongside a builder’s tape measure. Two fingers widths above your eyebrows is the best place to measure helmet size. This is directly above your ears and the area around the back of the head. To avoid applying pressure, don’t create pressure on the measuring tape. The feeling of wearing a snug baseball hat but not too fast can be a good guide.

  • Extra-small: below 20″ (51cm)
  • Small: 20″–21.75″ (51cm–55cm)
  • Medium: 21.75″–23.25″ (55cm–59cm)
  • Large: 23.25″–24.75″ (59cm–63cm)
  • Extra-large: above 24.75 (63cm)
  • Men (One size fits all helmets): 21.25″–24″ (54cm–61cm)
  • Women (One size fits all helmets): 19.75″–22.5″ (50cm–57cm)
  • Kids (One size fits all helmets): 18″–22.5″ (46cm–57cm)

The head shape

Typhoon motorcycle, snowmobile, and ATV helmets are made to fit oval heads and accommodate long oval and round head shapes.

  • Intermediate OvalThis shape is slightly longer back-to-front than the side-to-side. It measures from the forehead to where the most significant part of the skull is. This is the most popular head shape.
  • Long OvalThis head shape, similar to an intermediate oval, is shorter front-to-back than the side-to-side. However, it typically measures 1/2″ longer than medium oval shapes.
  • Round Oval– Measurements from front to back are more accurate than side-to-side.

Typhoon helmet sizes

Every helmet line has its own sizing guide. Typhoon snowmobile helmets are slightly larger than those on the road. Before purchasing, make sure you measure accurately. It is best to choose the larger size if your measurements are between two sizes. It is better not to wear the helmet too tight.

How to measure head for a bike helmet 

Sizes of bike helmets are measured in millimeters. To determine the correct size bike helmet, measure your head around the eyebrows. This is important? Studies have shown that a properly fitted bike helmet can reduce the risk of head injuries by up to 50%. Have a quick discussion on how to measure your head before purchasing a bike helmet.

Use a fabric measuring tool

  1. The fabric measuring tape should be wrapped around your head, about one inch above your eyebrows.
  2. Mark the distance from the head in cms.

A ruler and a piece of string are all you need

You can use a piece of string to measure fabric if you don’t own a measuring tape.

  1. The string should be wrapped around your head, approximately one inch above your eyebrows.
  2. Mark the distance of the series.
  3. To determine the length of the series in centimetres, place the line on a ruler or tape measure.

How to adjust a bicycle helmet

These 5 simple steps will ensure that your helmet fits correctly once you have selected the correct size helmet. Be careful that the helmet might work on your head, so it doesn’t slip off and is comfortable.

  1. Adjust the straps properly so that the helmet doesn’t slip around on the head.
  2. Adjust the internal sizing of the fit ringThis helps to keep the helmet securely on your head.
  3. You can move the helmet forwards and backwards as well as from side to side. The helmet should not move. Continue to adjust until the helmet fits snugly.
  4. Put the chin strap on. It should feel snug but not too tight. It shouldn’t feel too tight or uncomfortable.
  5. You must ensure that youPlace two fingers between your eyebrows and the helmet. If it doesn’t, then the helmet may be too small or not snug enough to the head.
  6. Finally, think about just the internal padding for a more comfortable fit Extra pads may be available to adjust your helmet’s fit.

Read more: How to wear a bike helmet

How to choose a perfect bike helmet

We present our step-by-step guide below to help you find the fitting bike helmet.

Measure your head 

Measurement of your head is the first step to finding the fitting helmet. We mean your head circumference. How do you measure the head circumference of a helmet? With the help of a flexible tape measure (this video is helpful)! Measure one inch from the point where your eyebrows and ears meet. You can get a tape measure for as low as $5 if you don’t have one. You don’t need one. Mark the points with a piece of string. Next, measure the distance with a yardstick.

Don’t forget the helmet

It’s pretty standard stuff, right. Yes, the helmet must fit properly. How does a bike helmet work properly? These are the signs of a properly fitting bike helmet. The helmet should be positioned at a low spot on your forehead, but it shouldn’t block your vision. Remember when you measured for your helmet size earlier? A distance of not more than one to two fingers should be between the top of your eyebrows and your ears. If you look up, the helmet’s front should be visible on your head. The straps of the helmet should be connected in a “Y-shaped” configuration just below your ears.

Tight the chain strap

Once you have secured your helmet over your head, tighten the chin strap. The helmet’s belts should be in a V shape under each ear, as mentioned earlier. Adjust each buckle until they do. If it is not designed to protect you, why wear a helmet on a bicycle?

Shake your head 

We are not insane! This will allow you to be sure that your helmet is properly on. You should feel the helmet pressing against your crown. There should not be any looseness. Keep tightening and adjusting until the fit is perfect. Uncomfortable tightness is also a concern. You don’t want your head to restrict circulation or be restricted in movement.

Enjoy your ride 

You’re done! Your heart will take control, and your mind will relax on the path, road, or trail. We are wishing you a safe and enjoyable ride, no matter where you are biking. It would help if you always ride safely. Wear a helmet and take every precaution. Ultimately it will help you prevent injury. Easy enough? You now know how to measure your head for the correct size helmet. Read the full guide on how to choose a bike helmet.

Different types of helmets 

All helmets are not created equal. Some helmets are better suited to athletic activities, while others are better for everyday commutes. Which one is best for you? Before you buy a bike helmet, have a quick look at three main types of helmets.

How to measure bike helmet size

Helmets for recreational use 

A recreational helmet is the best option if you are on a tight budget. Recreational helmets are perfect for casual riding and are ideal for amateur and casual riders.

Road bike helmets 

Do you enjoy trail biking? Or are you looking to do more serious, competitive athletic biking? A road bike helmet is designed to allow for more movement and has an aerodynamic design. These helmets are more breathable and ventilated to make sweaty rides more enjoyable.

Mountain bike helmets 

Mountain biking helmets are well ventilated and have a focus on the back of your head. A mountain bike helmet is an excellent option if you are often on dangerous trails.


We are confident that you will be satisfied with this article if you were trying to learn how to measure bike helmet size. It should fit comfortably if it is not too high on your forehead or more than two fingers below the chin strap. Have fun and stay safe!

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