Helmet Size

While helmet safety is regulated (DOT or SNELL), helmet size is far from standard and varies from brand to brand. The charts below are provided from each manufacturer as a reference when purchasing a helmet. Use the provided measuring tape or use a string to obtain an accurate measurement of your head before selecting a helmet size.

Shoei | HJC | Vega | Bikers Choice | KBC | Nolan | Novelties

Shoei
Head Circumference Helmet Size
Hat Size Inches Centimeters
6 1/4 – 6 1/2 19 3/4 – 20 1/8 50-52 CHILDS S/M
6 5/8 – 6 3/4 21 1/4 53-54 CHILDS L/XL
6 3/8 – 6 1/2 21 1/8 51-52 XXSmall
6 5/8 – 6 3/4 21 1/4 53-54 XSmall
6 7/8 – 7 21 5/8 55-56 Small
7 1/8 – 7 1/4 22 3/8 57-58 Medium
7 3/8 – 7 1/2 23 1/8 59-60 Large
7 5/8 – 7 3/4 23 1/2 61-62 XLarge
7 7/8 – 8 24 1/4 63-64 XXLarge
8 3/8 – 8 1/2 24 5/8 65-66 XXXLarge
HJC Adult
Head Circumference Helmet Size
Hat Size Inches Centimeters
6 3/8-6 1/2 20 1/4-20 1/2 51-52 XXSmall
6 5/8-6 3/4 20 7/8-21 1/4 53-54 XSmall
6 7/8-7 21 5/8-22 55-56 Small
7 1/8-7 1/4 22 3/8-22 3/4 57-58 Medium
7 3/8-7 1/2 23 1/8-23 1/2 59-60 Large
7 5/8-7 3/4 24-24 3/8 61-62 XLarge
7 7/8-8 24 3/4-25 1/8 63-64 XXLarge
8 1/8-8 1/4 25 1/2-26 65-66 XXXLarge
Vega

Head Circumference

Helmet Size

Hat Size

Inches

Centimeters

6 5/8 – 6 3/4 20.87 – 21.26 53 – 54 X Small
6 7/8 – 7 21.65 – 22.05 55 – 56 Small
7 1/8 – 7 1/4 22.44 – 22.83 57 – 58 Medium
7 3/8 – 7 1/2 23.23 – 23.62 59 – 60 Large
7 5/8 – 7 3/4 24.02 – 24.41 61 – 62 X Large
7 7/8 – 8 24.80 – 25.20 63 – 64 XX Large
8 1/8 – 8 1/4 25.60 – 26.00 65 – 66 XXXLarge
Bikers Choice
Head Circumference Helmet Size
Hat Size Inches Centimeters
6 5/8-6 3/4 20 7/8-21 1/4 53-54 XSmall
6 7/8-7 21 5/8-22 55-56 Small
7 1/8-7 1/4 22 3/8-22 3/4 57-58 Medium
7 3/8-7 1/2 23 1/8-23 1/2 59-60 Large
7 5/8-7 3/4 24-24 3/8 61-62 XLarge
7 7/8-8 24 3/4-25 1/8 63-64 XXLarge
KBC
Head Circumference Helmet Size
Hat Size Inches Centimeters
6 3/8-6 1/2 20 1/4-20 1/2 51-52 XXSmall
6 5/8-6 3/4 20 7/8-21 1/4 53-54 XSmall
6 7/8-7 21 5/8-22 55-56 Small
7 1/8-7 1/4 22 3/8-22 3/4 57-58 Medium
7 3/8-7 1/2 23 1/8-23 1/2 59-60 Large
7 5/8-7 3/4 24-24 3/8 61-62 XLarge
7 7/8-8 24 3/4-25 1/8 63-64 XXLarge
Nolan
Head Circumference Helmet Size
Hat Size Inches Centimeters
6 5/8-6 3/4 20 7/8-21 1/4 53-54 XSmall
6 7/8-7 21 5/8-22 55-56 Small
7 1/8-7 1/4 22 3/8-22 3/4 57-58 Medium
7 3/8-7 1/2 23 1/8-23 1/2 59-60 Large
7 5/8-7 3/4 24-24 3/8 61-62 XLarge
7 7/8-8 24 3/4 63 XXLarge
Novelties – Big German, Jockey and Kaiser

Head Circumference

Helmet Size

Hat Size

Inches

Centimeters

7 – 7 1/8 21 3/4 – 22 3/8 55 – 57 Small
7 1/4 – 7 1/2 22 1/2 – 23 1/8 57 – 59 Medium
7 5/8 – 7 3/4 23 1/4 – 24 60 – 60 Large
7 7/8 – 8 24 1/8 – 24 7/8 61 – 63 X Large
Novelties – Eagle, Smokey and Turtle.

Head Circumference

Helmet Size

Hat Size

Inches

Centimeters

6 1/2 – 6 5/8 20 1/4 – 20 7/8 51 – 53 X Small
6 3/4 – 6 7/8 21 – 21 5/8 53 – 55 Small
7 – 7 1/8 21 3/4 – 22 3/8 55 – 57 Medium
7 1/4 – 7 1/2 22 1/2 – 23 1/8 57 – 59 Large
7 5/8 – 7 3/4 23 1/4 – 24 60 – 60 X Large
7 7/8 – 8 24 1/8 – 24 7/8 61 – 63 XX Large
Novelties – Duck Tail, EZ Rider, Little German and Gladiator.

Head Circumference

Helmet Size

Hat Size

Inches

Centimeters

6 1/4 – 6 1/2 19 1/2 – 20 1/8 48 – 51 X Small
6 1/2 – 6 5/8 20 1/4 – 20 7/8 51 – 52 Small
6 3/4 – 6 7/8 21 – 21 5/8 52 – 55 Medium
6 7/8 – 7 1/8 21 3/4 – 22 3/8 55 – 56 Large
7 1/8 – 7 3/8 22 1/2 – 23 1/8 57 – 58 X Large
7 3/8 – 7 5/8 23 1/4 – 24 59 – 60 XX Large