As with all racing safety equipment, helmet fitment is critically important, and the helmet user can increase the risk of injury if they are not fitted properly. Please refer to the general helmet sizing chart below for proper helmet fitment.  This chart is for ADULT helmet sizing only unless certain manufacturers include YOUTH/JUNIOR sizes in their chart.  Otherwise, all YOUTH and JUNIOR helmet sizes will be shown below in a completely separate chart.

Properly Measuring Helmet Fitment For RaceQuip® Safety Helmets

  • Please first refer to your hat size.  

  • If you do not know your hat size, use a cloth tape measure and measure around the circumference of your head, just above your brow line.  

  • Measure the head approximately one inch above the eyebrows across a point at the back of the head that gives the largest measurement.

  • IMPORTANT NOTE: All helmets will 'Break-In' when first used. It is VERY important that the helmet fits as tight as one can comfortably withstand to wear.

RaceQuip® Safety - Helmet Sizing and Fitment Chart***
  Factory Published Helmet Size
Head Measurement
English Units - Inches (in)
Head Measurement
Metric Units - Centimeters (cm)
  Youth++ (see note below)
6-3/8 to 6-5/8
20 to 20-7/8
51 / 53
  Size XX-Small (Double Extra Small)
6-3/8 to 6-1/2
20 to 20-1/2
51 / 52
  Size X-Small (Extra Small)
6-5/8 to 6-3/4
20-7/8 to 21-1/4
53 / 54
  Size Small
6-7/8 to 7
21-5/8 to 22-1/16
55 / 56
  Size Medium
7-1/8 to 7-1/4
22-7/16 to 22-7/8
57 / 58
  Size Large
7-3/8 to 7-1/2
23-1/4 to 23-5/8 
59 / 60
  Size X-Large (Extra Large)
7-5/8 to 7-3/4
24 to 24-3/8
61 / 62
  Size 2X-Large (Double Extra Large)
7-7/8 to 8
24-13/16 to 25-3/16
63 / 64
  Size XXX-Large (Triple Extra Large)

++ YOUTH HELMETS - IMPORTANT NOTE - Youth SFI® Helmets have a smaller, lighter shell and are designed for lower speed youth racing.  

Racecar Engineering™ Has All of Your Helmet Accessories

Please remember that Racecar Engineering™ carries a full assortment of helmet accessories for the entire RaceQuip® Safety brand. We have in stock and ready to ship, replacement helmet shields, radio ear pieces, tear-offs, helmet storage bags and much, much more.

Feel free to browse our wide selection of RaceQuip® Safety products and buy online today.  If you have questions about choosing the right racing helmet for your respective motorsports segment, please contact one of our Technical Sales Associates for assistance.

At Racecar Engineering™ we work very hard to be every racer's 'One-Stop Racing Safety Shop'.

Return To:  Main Technical Center Page  |  Racing Helmet Info/Sizing Chart Page - All Brands

Related Tech Safety Topics:  Racing Suits | Driving Gloves | Driving Shoes | Head and Neck Restraints | Racing Seats

*** HELMET SIZING/FITMENT CHART DISCLAIMER: This helmet sizing/fitment chart has been created by Racecar Engineering™ for our customer's reference and ease-of-use using the latest fitment information available from the factory.  Please always refer to the factory website, factory printed materials and factory personnel advice for the latest helmet information about their brand of safety product.  The RaceQuip® Safety factory website can be accessed directly at (link opens new page) - Racecar Engineering™ is not responsible for any typographical errors contained in this helmet sizing chart/fitment material or the end-user's failure to verify & follow factory fitment specifications.