How to Measure for ATV Helmet Size? | Get the Right Fit

A helmet that doesn’t fit right won’t protect you the way it should. Whether you ride a full-size ATV or a youth model, getting the measurement correct is the single most important step before buying. The process takes about two minutes and requires only a flexible tape measure or a piece of string and a ruler.

How to Measure Your Head for an ATV Helmet

Wrap the tape measure around the widest part of your head. That’s usually about one inch above your eyebrows, just over the ears, and around the fullest point at the back of your skull. Keep the tape snug — tight enough to stay in place, but not so tight it compresses the skin. Take two or three measurements and use the largest number. If you plan to ride with a thin balaclava or skull cap, wear it while measuring.

What to Do With Your Measurement

Every helmet brand uses its own size chart. A measurement of 58 centimeters might be a Medium in one brand and a Large in another. Bell Racing’s size guide, Fox Racing’s helmet fit guide, and Ride Icon’s size chart all list head circumference ranges matched to specific shell sizes. Always check the chart for the exact model you want rather than assuming your hat size or a previous brand’s sizing carries over. If you land between two sizes, most manufacturers recommend choosing the smaller size for a snug fit — the padding compresses slightly over time.

How a Properly Fitted Helmet Should Feel

A helmet that fits correctly should feel snug all around your head without any single pressure point. When you shake your head side to side, the helmet should stay in place rather than sliding or wobbling. Your cheeks should feel padded but not painful, and you should be able to breathe and speak normally. If you can fit more than one finger between your temple and the padding, the helmet is too large. A quick real-world check: with the chin strap fastened, try rolling the helmet forward off your head — if you can pull it off easily, it’s too loose.

For women riders especially, getting the right fit matters because many standard helmet shapes are designed around average male head proportions. If you’re in the market, our tested roundup of the best women’s ATV helmets covers models that fit different head shapes and riding styles.

Common Measuring Mistakes That Ruin the Fit

Most fit problems come from a handful of avoidable errors. Measuring across your face or the forehead alone gives a reading that’s too small. Placing the tape too high on the crown or too low near the neck produces an unreliable number. Pulling the tape too tight or reading it too loosely both distort the result. Using a single measurement without repeating it once or twice can miss the real circumference. The most common mistake people make is assuming all brands size the same way — that assumption leads directly to ordering the wrong shell size and having to return it. Never guess your helmet size; measure it fresh each time you buy.