How to Measure for Motorcycle Helmet to Find Your Perfect Fit

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Riding a motorcycle to places is a common experience in everyone’s life. But some people do not consider a helmet to be the fairy godmother for their own safety. Even if you are riding a bike with a helmet on but of the wrong size, it is the same thing as not wearing one.

While buying a helmet always make sure that you have the correct measurements to find the perfect size that comfortably fits on your head. But very few know how to measure for motorcycle helmet when they’re trying to buy one.

We have designed a complete guide for beginners, along with tips and step-by-step directions, elucidating on how to measure for a motorcycle helmet.

Types of Motorcycle Helmet

Each motorcycle rider has their own taste and preferences when it comes to choosing a helmet for themselves. We have listed a few helmets types to help you to choose the best.

1. Full Face Helmets

As the name suggests, these helmets are designed for full-face coverage including your neck. Full-face helmets are considered to be the safest helmet for motorcycles. These helmets are versatile and can be paired with any type of motorcycle.

2. Modular Helmets

These are also known as flip-up helmets. A combination of ¾ and full-face helmets resulted in the creation of modular helmets. The chin bar and visor of these helmets can be lifted and fixed up to produce an open face helmet.

These helmets are preferred mostly by cruisers, tourers, and adventure-seeking riders due to their multitasking ability. The best modular helmets are designed for an upright head position and have wide and straight-forward eye-openings. It allows the riders to attach additional accessories like speakers or motorcycle helmet cameras.

3. ¾ or Open Face Helmets

The open face helmets will suit you best if you are riding a scooter. These helmets are preferred by the people who want to feel the air on their face while riding. Although these helmets do not protect the riders from weather and road debris, they are comparatively lighter in weight than full-face helmets.

4. Off-Road or Motocross Helmets

If you love to ride apart and afar from the streets, on the dirt roads, the off-road helmets would work wonders for you. These helmets are designed for max protection, minimal weight, and excellent ventilation while riding a motocross or dirt bike.

Although they do not offer eye protection, they are heavily preferred when it comes to preventing dust and debris intrusion from the bottom parts of the helmet for off-road extravaganzas.

How to Measure for a Motorcycle Helmet

Your head circumference plays a crucial role in determining helmet size. The first and most important step is to measure the circumference of the head to buy a properly fitting and safe motorcycle helmet.

1. Use a tailor or seamstress tape for the measurements

  • You can also use a string or cord for measuring your head. After taking the measures, lay the string next to a scale or builder’s tape to acquire the measures.

2. Place the string or tape just two-finger space above the eyebrows, directly on the ears, and wrap it around your head.

  • While taking the measure, you must ensure that the tape is as close to your skin without causing any discomfort or using forceful pressure.
  • It should feel like wearing a cap that is not too tight, stays in one place, and just feels right.

3. Jot down the measurements on a piece of paper or make a note.

4. Evaluate the measurements to determine the correct circumference and hat size for the helmet.

  • Here’s a table that shows the helmet hat size(fitted) based on circumference(in inches).
Circumference of the Head (In inches) Hat Size
21 ¼ 

21 ⅝


22 ⅜

22 ¾

23 ⅛

23 ½

23 ⅞

24 ¼

24 ⅝


6 ¾

6 ⅞


7 ⅛

7 ¼

7 ⅜

7 ½

7 ⅝

7 ¾

7 ⅞


5. You are now ready to purchase the best helmets that would ensure your comfort and safety while riding a motorcycle.

Things to Keep in Mind

1. Always keep the head shape in mind. Most helmets are designed for oval or long-oval head shapes.

2. The Motorcycle Helmet size guide,

XS < 20″ 51cm
S 20” – 21.75” 51 – 55 cm
M 21.75” – 23.25” 55 -59 cm
L 23.25” – 24.75” 59 – 63 cm
XL 24.75” 63 cm
All Size Fit This size has a highly adjustable structure and fitting system

3. If your head shape is,

  • Partially oval: start the measurements from the forehead to the largest area of the head at the back.
  • Long-oval: this face shape is longer from front-to-back, as compared to from side-to-side, and is commonly measured ½-inch longer than the partially oval head shape.
  • Rounded-oval: front-back measurements are nearer in proportion to the side-side head measurements.

4. If your head measurements lie between two sizes, always go for the larger one.
5. The helmet you purchase must fit snugly without feeling tight or uncomfortable.
6. Try the helmet to check its fitting before you purchase it.
7. The size of every helmet manufacturing brand differs slightly, so ensure that you get a correctly sized one.
8. When trying a helmet to check its fit, make sure the chin strap is tight enough so that just two fingers can fit between your chin and the strap.
9. While testing the chin straps, look downwards and try to pull up the helmet. If it is pushable to a great extent, DO NOT BUY it, as it would lack the fit-grip to save you from any mishaps.
10. When buying a helmet, make sure that the helmet has all the elements that contribute to a reasonable safety level.
11. The anatomy of a safe helmet must include:

  • A heavy-duty impact-absorbing inner liner
  • Padded inner layers for extra comfort
  • Strong chin strap/ retention system
  • High-quality face shield/ visor
  • Proper ventilationCarbon fiber, polycarbonate, or Kevlar built outer shells that assure high protection from abrasions or unwanted penetration from outside objects.


A helmet is the power-shield of protection while riding a motorcycle. It is very wise of you to consider the sizing and measurement of the helmet before purchasing it. We hope that this guide helps you to learn how to measure for motorcycle helmet and choose the best helmets that suit & fit you perfectly.

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Nathan Olvera

Nathan Olvera

Nathan was born and raised in Nevada where he spent some of his earliest days cycling around the neighborhood and gradually developed a great deal of love for motorbikes.
Nathan Olvera

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