How to Measure Your Head for a Motorcycle Helmet
Five minutes with a tape measure beats three returns to the retailer.
The method
- Get a flexible tape measure — cloth or plastic, not a metal construction tape. A string or cable works too (mark it, then measure the string against a ruler).
- Position it about one inch (2.5 cm) above your eyebrows — right where a helmet's brow line will sit.
- Wrap level around the widest part of the back of your head — over the occipital bump, not up near the crown. You're after the largest circumference, which is roughly forehead-to-back-of-skull.
- Snug, not tight. The tape should lie flat without compressing your skin or your hair more than a helmet would.
- Take three measurements and keep the largest. Tape position drifts; the largest reading is the honest one.
- Write down centimeters AND inches. Brand charts use cm; US retailers often list inches. 58 cm ≈ 22.8 in.
Mistakes that get people the wrong size
- Measuring the forehead only. A loop just around the front of the head undershoots by 1–2 cm and you end up a size too small.
- Measuring over a thick hairstyle or beanie. Compress hair the way a snug helmet will. Long hair adds half a size of phantom measurement.
- Using the smallest reading. People instinctively trust the smallest number. Use the largest — a too-small helmet gives you a headache; a correctly snug one doesn't.
- Measuring once. Tape angle shifts. Three readings, largest wins.
Got your number?
Plug it into the helmet size finder, then run through the fit checklist when the helmet arrives.
Gear to buy it right: Soft measuring tape
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