Find your perfect football helmet size in seconds. Enter your head circumference (in inches or centimeters) and get back your recommended helmet size (Small, Medium, Large, or X-Large) along with your hat size equivalent. Measure around your head about 1 inch above your eyebrows for the most accurate fit.
Recommended Helmet Size
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Hat Size Equivalent
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Head Circumference (inches)
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Head Circumference (cm)
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Wrap a flexible cloth measuring tape around the widest part of your head, approximately 1 inch (2.5 cm) above your eyebrows. Keep the tape level and snug but not tight. If you don't have a measuring tape, use a piece of string, then lay it flat and measure the length with a ruler.
Standard football helmet sizes are Small (up to 20 3/8 inches), Medium (20 3/8" – 22"), Large (22" – 23 1/2"), and X-Large (23 1/2" and above). Some brands also offer XS or XXL sizes for extreme measurements.
If your head circumference falls between two sizes, it is generally recommended to choose the smaller size. A properly fitting football helmet should feel snug without causing discomfort, and many helmets have internal padding that can be adjusted for a customized fit.
Hat size is a traditional sizing system based on head circumference divided by pi (π ≈ 3.14159), expressed in fractions of inches. It is used primarily for baseball caps, dress hats, and some helmet brands. For example, a 22-inch circumference equals approximately a size 7 hat.
Yes, head shape matters. Some people have rounder (oval) or longer (oblong) heads, which can affect fit even if the circumference measurement is the same. Always try a helmet on when possible, and look for brands or models that suit your specific head shape for the best protection.
Absolutely. Simply measure your head circumference in centimeters and use this calculator — it will convert the measurement and give you the correct helmet size. As a quick reference, 1 inch equals 2.54 centimeters.
A correctly fitted helmet should sit level on your head, about one to two finger-widths above your eyebrows. It should feel snug on all sides without pinching or causing headaches. When you shake your head, the helmet should move with your head, not slide around independently.
Yes, youth helmets are designed for smaller head circumferences (typically under 20 inches) and have their own size charts. Always check the specific manufacturer's youth sizing guide, as sizes vary by brand and model.