Help & Advice

Back to results

Finding the Right Size Kids Helmet

Image for Finding the Right Size Kids Helmet article

This handy guide to children's helmets will help you to make sure that your child's head is properly protected when they're out on their bike, scooter, or skateboard.

Finding the Right Size Kids' Helmet

Ensuring your little one wears a helmet whilst out on their bike, scooter, or skateboard is incredibly important, but a helmet that doesn't fit right offers much less protection than it should. We've put together this guide to fitting kids' helmets to make sure that your child is as safe as can be when out on their bike.

Getting the right size kids' helmet

Helmets that are too big or small will be uncomfortable to wear and, more importantly, don't offer as much protection from bumps as they should. It might be tempting to buy a larger one for your child to grow into, but it's really important to have a helmet that's the right size.

How to measure for a kids' helmet

Usually, helmets are advertised with a size in centimetres. This size directly relates to the circumference of the head.

To measure your child's head, just follow these steps:

  1. Take a fabric measuring tape and wrap it around the head about an inch above the eyebrows.
  2. Measure from here, making sure the tape is level all the way round.
  3. Don't have a measuring tape? Use some string instead! Mark or cut the string and then straighten it out next to a tape measure or ruler to get the circumference.

How to tell if it fits properly

After measuring your child's head circumference, you'll have a rough starting point for helmet sizes. Pop into store with your little one and try some helmets out, looking at how it sits on the head. It should be level, with a gap of about an inch or two fingers between the eyebrow and the helmet. Make sure that all the straps and adjustments are firm but not too tight.



Bell Interval Bike Helmet
Bell Interval Bike Helmet

Too big

If the helmet can move around a lot, it's probably too big. Double check that the straps and adjusters are tight, and if so, try a smaller size.

Too small

If the helmet sits high on top of the head or leaves a visible line on the skin, it's probably too small. Your child should be able to put on glasses with the helmet.

Straps and adjusters

Kids' helmets come with all sorts of different ways of adjusting the fit, but the most common are either different sized foam pads or a clicky dial at the rear to adjust the size of the helmet. This means that they can fit a range of different sizes and can grow a little bit with your child.

The chin strap should not hang loose, but also should allow your child to open their mouth easily, before going comfortably around the ears. Straps can normally be adjusted in these places, so this is an easy area to fit.

Different kinds of melon!

While measuring can give you a good starting point for what size helmet you might need, and helmets are adjustable, there's no getting away from the fact that heads come in a lot of different shapes and sizes.

There's no substitute for trying a helmet on, so we recommend that if you're not sure of which you'll need, it's best to pop into store. Here at Halfords we can also help you measure your child's head and recommend helmets for you, giving you that little extra bit of peace of mind.


Shop all kids' helmets