This helmet size chart has been compiled from helmet manufacturers’ literature, sizing charts and years of experience assisting customers with helmet purchases.
Not all helmets are
created equal. Just because you wear a medium Shoei doesn’t mean a medium Arai or Bell will fit.
Measure Your Head
Even if you say you know your size, a good salesperson will still measure your head. Due to different shapes, heads that are apparently the same size when measured with a tape may not necessarily fit the same size helmet.
Measure the circumference (all the way around) of the head at a point approximately one half to one inch above the eyebrows, and at a point on the back of the head that results in the largest possible measurement. Take several measurements, to make sure you have the largest one. Use that one to determine your size. The standard procedure is measure your head to get your size, put the helmet on & shake your head a little, see how it feels. Have you ever gotten your head stuck in a helmet that was On the other end of the spectrum when people start way too large, the helmet goes on easily then they shake their head and the helmet goes bouncing down the aisle. When you shake your head the helmet should not move more than 1/4″. If the lid shifts on your head just shaking it a little, imagine what it will do on the bike at 65mph. The wind can get under it and it starts to lift or roll back farther on your head. Regardless of DOT or Snell rating, an ill fitting helmet will not offer the maximum protection in a crash. You can live without a leg or an arm. How many dudes do you know who have no head? If you want to purchase from an online discount motorcycle helmet retailer, Craigslist or an ebay auction to save money, go for it. Just make sure that before you order it you try on the same, or a similar model from the same manufacturer, first. Never substitute a really great ad and sizing chart for actually trying it on. Go to a dealer and try on a new helmet. Do not try your buddy’s Even if you are pretty certain of what you want, make sure the retailer has a decent return or exchange policy, in case you change your mind. |
Try
Using the helmet size and conversion charts below you may notice that the inches and centimeter measurements will not be equal nor exact.
One centimeter is approximately 0.393700787402 inches. Some manufacturers do not carry the number out 12 decimal places so 21 inches is 53cm to some and 55 to others.
Helmet Size Conversion Chart
Brand | Helmet Size |
Head – Inches |
Head – cm | Hat Size |
Answer | X-Small Small Medium Large X-Large |
20″ – 20 1/2″ 21 1/2″ – 22″ 22 1/2″ – 22 3/4″ 23 1/4″ – 23 1/2″ 24″ – 24 1/2″ |
6 5/8″ – 6 3/4″ 6 7/8″ – 7″ 7 1/8″ – 7 1/4″ 7 3/8″ – 7 1/2″ 7 5/8″ – 7 3/4″ |
|
Arai | XXX-Small XX-Small X-Small Small Medium Large X-Large XX-Large XXX-Large |
19 1/4″ – 19 5/8″ 20″ – 20 3/8″ 20 1/4″ – 20 7/8″ 21″ – 21 5/8″ 21 3/4″ – 22 3/8″ 22 1/2″ – 23 1/8″ 23 1/4″ – 24″ 24 1/8″ – 24 7/8″ 25″ – 25 5/8″ |
49-50cm 51-52cm 53-54cm 55-56cm 57-58cm 59-60cm 61-62cm 63-64cm 65-66cm |
n/a n/a XS 6 1/2″ – 6 5/8″ S 6 3/4″ – 6 7/8″ M 7″ – 7 1/8″ L 7 1/4″ – 7 3/8″ XL 7 1/2″ – 7 5/8″ XXL 7 3/4″ – 7 7/8″ XXXL 8″ – 8 1/8″ |
Shoei | XX-Small X-Small Small Medium Large X-Large XX-Large XXX-Large |
20 1/8″ – 20 1/4″ 20 7/8″ – 21 1/4″ 21 5/8″ – 22″ 22 1/2″ – 22 7/8″ 23 1/4″ – 23 5/8″ 24″ – 24 3/8″ 24 3/4″ – 25 1/8″ 25 5/8″ – 26″ |
51-52cm 53-54cm 55-56cm 57-58cm 59-60cm 61-62cm 63-64cm 65-66cm |
n/a 6 5/8″ – 6 3/4″ 6 7/8″ – 7″ 7 1/8″ – 7 1/4″ 7 3/8″ – 7 1/2″ 7 5/8″ – 7 3/4″ 7 7/8″ – 8″ 8 1/8″ – 8 1/4″ |
Cyber | X-Small Small Medium Large X-Large XX-Large XXX-Large |
20 1/2″ 21″ – 21 5/8″ 21 3/4″ – 22 3/8″ 22 1/2″ – 23 1/8″ 23 1/4″ – 24″ 24 1/4″ – 25″ 25 1/4″ – 25 5/8″ |
53cm 55cm 57cm 59cm 61cm 63cm 65cm |
XS 6 1/2″ S 6 3/4″ – 6 7/8″ M 7″ – 7 1/8″ L 7 1/4″ – 7 3/8″ XL 7 1/2″ – 7 5/8″ XXL 7 3/4″ – 7 7/8″ XXXL 8″ – 8 1/8″ |
Fox Racing | Youth KS KM KL Adult X-Small Small Medium Large X-Large XX-Large |
18 6/8″ – 19 5/8″ 19 1/4″ – 20″ 20 1/8″ – 21″ 20 1/2″ – 21 1/16″ |
XS XS |
|
Suomy | X-Small Small Medium Large X-Large XX-Large XXX-Large |
20 1/2″ – 20 7/8″ 21 1/4″ – 21 5/8″ 22″ – 22 1/2″ 22 7/8″ – 23 1/4″ 23 5/8″ – 24″ 24 1/2″ – 24 7/8″ 25 1/4″ – 25 5/8″ |
53-54cm 55-56cm 57-58cm 59-60cm 61-62cm 63-64cm 65-66cm |
XS 6 1/2″ – 6 5/8″ S 6 3/4″ – 6 7/8″ M 7″ – 7 1/8″ L 7 1/4″ – 7 3/8″ XL 7 1/2″ – 7 5/8″ XXL 7 3/4″ – 7 7/8″ XXXL 8″ – 8 1/2″ |
HJC | Youth S/M Youth L/XL XXX-Small XX-Small X-Small Small Medium Large X-Large XX-Large XXX-Large |
19 3/4″ – 20 1/8″ 20 1/2″ – 21 1/4″ 19 1/4″ – 19 3/4″ 20″ – 20 1/2″ 20 7/8″ – 21 1/4″ 21 3/8″ – 22″ 22 1/6″ – 22 7/8″ 23 1/4″ – 23 5/8″ 24″ – 24 1/2″ 24 3/4″ – 25 1/4″ 25 1/8″ – 26″ |
50-52cm 53-54cm 49-50cm 51-52cm 53-54cm 55-56cm 57-58cm 59-60cm 61-62cm 63-64cm 65-66cm |
n/a XS 6 5/8″ – 6 3/4″ n/a XS 6 3/8″ – 6 1/2″ XS/S 6 5/8″ – 6 3/4″ S/M 6 7/8″ – 7″ M/L 7 1/8″ 7 1/4″ L/XL 7 3/8″ – 7 1/2″ XL/XXL 7 5/8″ – 7 3/4″ XXL/XXXL 7 7/8″ – 8″ XXXL 8 1/8″ – 8 1/4″ |
Thor | XX-Small X-Small Small Medium Large X-Large XX-Large |
20 1/2″ 20 7/8″ – 21 1/4″ 21 5/8″ – 22″ 22 3/8″ 22 3/4″ – 23 1/8″ 23 1/2″ – 24 24 3/4″ – 25 1/8″ |
52-53cm 53-54cm 55-56cm 57-58cm 59-60cm 61-62cm 63-64cm |
XS 6 1/2″ XS/S 6 5/8″ – 6 3/4″ S/M 6 7/8″ – 7″ M/L 7 1/8″ 7 1/4″ L/XL 7 3/8″ – 7 1/2″ XL/XXL 7 5/8″ – 7 3/4″ XXXL 7 7/8″ – 8 1/8″ |
Bell | Youth Small Youth Medium Youth Large X-Small Small Medium Large X-Large XX-Large |
19 1/2″ – 20″ 20″ – 20 1/2″ 20 1/2″ – 21″ 20 7/8″ – 21 1/4″ 21 5/8″ – 22″ 22 3/8″ – 22 3/4″ 23 1/4″ – 23 5/8″ 24″ – 24 3/8″ 24 3/4″ – 25 1/4″ |
50-51cm 51-52cm 52-53cm 53-54cm 55-56cm 57-58cm 59-60cm 61-62cm 63-64cm |
5 7/8″ – 6 1/8″ XS 6 1/8″ – 6 3/8″ XS 6 3/8″ – 6 5/8″ XS/S 6 5/8″ – 6 3/4″ S/M 6 7/8″ – 7″ M/L 7 1/8″ – 7 1/4″ L/XL 7 3/8″ – 7 1/2″ XXL 7 5/8″ – 7 3/4″ XXL/XXXL 7 7/8″ – 8″ |
While the helmet size chart may be the same, street helmet fitment often differs from offroad helmets from the same manufacturer. If you wear an XL street helmet you may only wear a L off-road style. This page will give you a head start and save you from trying on a half dozen helmets before you find your size.
Notes about Arai
|
The helmet size cross reference chart below is just to give you a quick idea of where you may fit when switching helmet brands. It is not an absolute rule that if your head measures 7″ in circumference only a Bell small will fit you. You may be better off with the Bell medium. The only way to be sure is to try both of the sizes on.
Do not assume that all brands will fit you. For instance my first helmet was a Shoei. I think it was one of the RF models. I never liked it, it never fit “right”. The size smaller, I could not get on my head. The size larger was too big. I switched to a KBC and it was better, but not perfect. Then the Shoei Duo-Tec came out. It fits really well, I absolutely love it. Also, I wear glasses and the Duo-Tec flip up design enables me to put on and take off my helmet without removing my glasses.
Everyone has a different head shape. Try on all the brands you can find until you find the one that is right for you.
Helmet to Hat Size Cross-Reference
Hat Sizes – Helmet Sizes |
|||||||||||||
Brand | 6 1/4″ | 6 1/2″ | 6 5/8″ | 6 3/4″ | 6 7/8″ | 7″ | 7 1/8″ | 7 3/8″ | 7 1/2″ | 7 5/8″ | 7 3/4″ | 8″ | 8 1/4″ |
Answer | XS | XS | SM | SM | M | L | L | XL | XL | ||||
Arai | XS | XS | SM | SM | M | M | L | XL | XL | XXL | XXXL | ||
Shoei | XS | XS | SM | SM | M | L | L | XL | XL | XXL | XXXL | ||
Cyber | XS | S | S | M | M | L | XL | XL | XXL | XXXL | |||
Suomy | XS | XS | S | S | M | M | L | XL | XL | XXL | XXXL | XXXL | |
HJC | XXS | Y-L/XL XS |
Y-L/XL XS |
S | S | M | L | L | XL | XL | XXL | XXXL | |
Thor | XXS | XS | XS | S | S | M | L | L | XL | XL | XXL | ||
Bell | YM | YL | XS | XS | S | S | M | L | L | XL | XL | XXL |
Childrens Helmet Size
Buying helmets for children can be time consuming and stressful. When trying a helmet on a child, start with a helmet size that looks too large and show them how to put it on. If you hand to the them and say put this on, they will pull it straight down over their head, bend the ears over and scream. It will hurt to pull it off & they will not want to try again.
To check for proper fitment, tell them to hold still and then you grab the helmet & try to shift it on their head. Just like the adult helmets it should not move more than 1/4″. Most children will complain that it is too tight, even when it fits correctly. Let them wear it for a few minutes. When you remove it check the child’s forehead for hot, red marks (not just pink). These are pressure points. |
DO NOT buy a helmet that is too large. You do not want them to “grow into it”. It will not protect them from head injury until it fits properly.
An ill-fitting helmet can be worse than no helmet at all. If your kid is using one hand to fix her helmet or hold it still, how is she holding on? It can shift while they are riding and block vision. It can also fly off during hard riding.
A helmet size chart, no matter how comprehensive it is, is no substitute for trying the helmet on!
We have not included any helmet size information for novelty type helmets. They do nothing more than a baseball cap to protect your head in a crash. So it really doesn’t matter if they fit well or not.
If you think you look cool in a skid lid, aka brain bucket, just think how cool you will look in your black and chrome wheelchair.
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