Child Helmet Size Chart Age | All Explained

  • By: Kevinsmak
  • Date: September 15, 2022
  • Time to read: 7 min.
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Helmets are important safety gear for kids riding bicycles, skateboards, and scooters. Although it is not required by law in every state, the use of helmets can reduce the risk of head injuries by as much as 85 percent.

Do you have a child that needs a helmet? If so, do you know what size to get them? It can be confusing trying to figure out the right size, especially since there are different sizes for different ages.

To buy a kids’ helmet, you must know the child’s head circumference. This is because all helmets have an internal sizing ring that needs to fit snugly around the head. Helmet sizes are not solely based on age. However, sometimes you can approximate the circumference of your child’s head.

Child Helmet Size Chart

You can use the chart below to get a general idea of what size helmet your child will need. Please note that this is just a guide and that head circumferences can vary greatly from child to child.

The best way to determine the correct size for your child is to measure their head circumference and then compare it to the sizes listed below.

Age(yrs.)Head Circumference(cm)
12 months46

When in doubt, always err on the side of buying a larger helmet. You can always pad a larger helmet with thin cotton pads to make it fit better.

A helmet that is too small will be uncomfortable and could potentially be dangerous.

How To Get a Perfect Helmet for Your Child

The following steps will help you get the perfect helmet for your child:

Measure Your Child’s Head

It is very important to measure your child’s head before you buy a helmet. You can do this by wrapping a flexible tape measure around their head, just above the eyebrows.

Ensure the tape measure is level all the way around and that you measure at the largest point of their head.

Check The Size Chart

Once you have the measurement of your child’s head, you can compare it to the size chart above. As a general rule, you should always buy a helmet at least one size larger than your child’s head circumference.

Try The Helmet On

Before you buy the helmet, make sure you try it on your child. The helmet should fit snugly but not be too tight. It should also sit level on their head, not tilted back or forward.

The straps should be adjusted, so they are tight enough that the helmet does not move around on their head but not so tight that it is uncomfortable.

Adjust the Side Straps

The side straps of the helmet should form a “Y” shape just below your child’s ear. The straps should be tight enough that you can only fit two fingers between the strap and their chin.

Buckle The Chin Strap

The chin strap should be buckled so it is snug against your child’s chin. You should not be able to fit more than one finger between the strap and the chin.

Keep Checking Regularly

Even after you have found the perfect helmet for your child, it is important to keep checking it regularly. Their head circumference will change as your child grows, and they may need a different size helmet.

Additionally, the straps may loosen over time and need to be adjusted.

Kids Helmet Buying Guide

When it comes to buying a helmet for your child, there are a few things you need to keep in mind.

Helmets Are Not One Size Fits All

Helmets are not one size fits all. Just because your child is a certain age does not mean they will need the same size helmet as other kids their age.

It is important to measure their head circumference and then check the size chart to find the right helmet for them.

You Can’t Always Judge by Age

The sizes of helmets are not always based on age. In fact, many helmets are sized by head circumference. This means that a child with a larger head may need a bigger helmet than an older child with a smaller head.

Multiple Impact Protection System

MIPS is an extra safety feature that is available on a number of expensive helmets. No matter which way the collision is coming from, the Multi-directional Impact Protection System, or MIPS, enables the energy from the crash impact to be absorbed by the helmet.

MIPS can reduce brain damage by 30%. The system consists of a non-obtrusive inner plastic cage that is attached to the foam core with flexible rubber anchors.

The foam core might spin around the child’s head due to the anchors stretching after impact. The spinning movement dissipates the crash’s energy before reaching the brain.

MIPS helmets are more expensive than regular helmets, but they offer extra protection for your child. If you can afford it, we recommend buying a helmet with MIPS.

Look for the Safety Certification Label

All helmets must have a safety certification label. This label will tell you if the helmet meets the safety standards set by the CPSC.

The label will also tell you what size the helmet is. Make sure you check the helmet size against your child’s head circumference before buying it.

Internal Adjustability Is Key

When trying on helmets, look for one with internal adjustability. This means that the helmet has a dial or some other mechanism that you can use to tighten or loosen the helmet’s fit.

This is important because it allows you to get a perfect fit and makes it easy to adjust the helmet as your child’s head size changes.

Check the Strap Length

The straps on the helmet should be long enough to go under your child’s chin and then buckle in the front. They should also be adjustable, so you can tighten or loosen them as needed.

In-Mold vs. Hard Shell Construction

Most helmets on the market today are made with either in-mold or hard-shell construction. In-mold construction means the helmet’s inner foam liner is bonded to the outer shell. This makes for a lighter-weight helmet that still provides good protection.

Hard shell helmets have a separate inner liner and outer shell. They tend to be heavier than in-mold helmets but are often less expensive.

Visors-Son and Facial Protection

Most helmets come with a visor to help protect your child’s eyes from the sun and other elements. If you are looking for additional protection, you can find helmets with face guards or full-face coverage.


When it comes to ventilation, more is usually better. Look for a helmet with plenty of vents to help keep your child’s head cool.

Find a Helmet Your Child Will Actually Wear

The most important thing to remember when buying a helmet for your child is that they need to actually wear it. This means finding a helmet that they like and that fits well.

It can be tricky, but it’s worth it to find a helmet that your child will actually wear.

Helmet Size FAQs

How often should I replace my child’s helmet?

Ideally, you should replace your child’s helmet every three to five years. However, if the helmet is damaged, it needs to be replaced immediately.

What is the best type of helmet for my child?

The best type of helmet for your child depends on their individual needs. For example, if they are particularly active, you might want to look for a helmet with extra protection.

You’ll want to find a well-ventilated helmet if they are sensitive to heat.

What is the best way to clean my child’s helmet?

You can use a mild soap and water solution to clean the helmet. Avoid using harsh chemicals, which can damage the helmet.

How do I know if my child’s helmet fits properly?

A good fit is important for a helmet to be effective. The helmets should sit level on your child’s head and cover their forehead.

The straps should be adjusted so the helmet is snug but not too tight. You should also be able to fit two fingers between the strap and your child’s chin.

Should a helmet cover the forehead of my child?

Most helmets extend down to cover the forehead. This provides additional protection in the event of a fall.

My child says their helmet is uncomfortable; what can I do?

If your child complains that their helmet is uncomfortable, try adjusting the straps or the internal adjusters. You can also add padding to the inside of the helmet to make it more comfortable.

Final Thoughts

Your child’s age, head size, and activity level are all important factors to consider when choosing a helmet. You’ll also want to ensure the helmet is comfortable and that your child will wear it.

With so many different helmets on the market, you’re sure to find one that’s perfect for your child with the help of the size chart and tips in this article. Happy shopping.

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