How to Measure Your Head for a Helmet

Getting your helmet size right is more than just comfort; it's fundamental to its protective capabilities. A helmet that fits properly stays in place during impacts, ensuring it can do its job effectively. We'll show you exactly how to get the most accurate head circumference measurement, which is your key to unlocking that perfect fit.

In our research, we've found that a properly fitted helmet can significantly enhance safety. For instance, manufacturer specifications often indicate that a helmet should remain stable and not shift more than a centimeter in any direction during strenuous activity, as per testing guidelines. This level of security is only achievable with an accurate measurement.

Quick Answer

To measure your head for a helmet, use a soft measuring tape. Wrap it around the widest part of your head, about an inch above your eyebrows and ears. Keep the tape level and snug, but not tight.

Record the measurement in inches or centimeters. This figure is your head circumference, crucial for matching helmet sizes.

Why Measuring Your Head for a Helmet Is Crucial

Think of your helmet as a crucial piece of safety gear. Its primary function is to absorb impact and protect your brain, and this only works if it sits correctly on your head. If it's too loose, it can slide out of position during a fall or impact, rendering it ineffective.

On the flip side, a helmet that's too tight can cause discomfort, headaches, and even restrict blood flow, making it a chore to wear. Manufacturer sizing charts, like those found on the National Highway Traffic Safety Administration (NHTSA) website, rely on an accurate head circumference to guide you to the correct size.

What You'll Need to Get Started

You don't need a lot of fancy equipment to get your head measurement. The most important tool is a soft measuring tape. This is typically made of flexible material, like cloth or a vinyl-coated fiberglass, allowing it to conform to the curves of your head.

If you don't have a soft tape measure handy, a piece of non-stretchy string or cord works just as well. You'll also need a ruler or a standard measuring tape to measure the string once it's in place.

Step-by-Step: How to Measure Your Head for a Helmet

Getting your head measurement is a simple, three-step process. Accuracy here makes all the difference when selecting a helmet.

Finding the Widest Part

Visualize the widest point around your head. Generally, this is about an inch or roughly 2.5 cm above your eyebrows and ears, wrapping around to the back. It’s not necessarily the highest point or the front of your forehead; we're looking for the circumference that captures the broadest span.

Wrapping the Tape Measure

With your soft measuring tape or string, start at the middle of your forehead, right above your eyebrows. Gently bring the tape around the back of your head, ensuring it stays level and parallel to the ground all the way around. You want the tape to be snug against your head, feeling firm but not uncomfortably tight.

Reading and Recording Your Measurement

Once the tape measure has made its way back to your forehead and completed the circle, note where the end of the tape meets the beginning. If you used string, mark the point where it overlaps and then lay it flat against a ruler or standard measuring tape to find the length. Record this measurement, noting whether it's in inches or centimeters, as this is your head circumference.

Pro Tips for an Accurate Head Measurement

To ensure you get the most precise measurement for your helmet, keep these tips in mind. They help avoid common pitfalls and lead to a better fit.

• Consider Your Hair: If you typically wear your hair in a specific style, like a ponytail or bun, when you'll be wearing the helmet, measure over that hairstyle. A helmet needs to fit over your usual head shape with your hair in place.
• Check for the Widest Circumference: Gently feel the back of your head. Sometimes there’s a slight bump. Make sure your tape measure is going around the absolute widest part of your head, even if that means the tape dips slightly lower in the back than in the front.
• Avoid Overtightening: The goal is a snug fit, not a constriction. You should be able to comfortably slide one or two fingers between the tape measure and your head. Too much pressure can distort the measurement.
• Measure Twice: For absolute certainty, especially if it's your first time doing this, take the measurement a second time. This helps catch any slight inaccuracies and builds confidence in your reading.

What to Do With Your Head Measurement: Matching to Helmet Sizes

Your head circumference is the primary key to unlocking the correct helmet size. Helmet manufacturers provide sizing charts that translate these measurements into their specific size designations, which often come in small (S), medium (M), large (L), and extra-large (XL), or sometimes more precise numerical ranges. For example, a common size range you might see is that a medium helmet fits heads between 21.5 and 23 inches (or 55-58 cm) in circumference.

Always consult the specific brand's sizing chart, as these can vary slightly between manufacturers.

When you look at a helmet's sizing guide, you'll typically see something like this:

Note: These are typical ranges and actual sizes may vary by brand.

Common Mistakes When Measuring Your Head

Even with straightforward steps, some common errors can lead to an inaccurate head measurement, resulting in a poorly fitting helmet. Being aware of these potential pitfalls can help you avoid them.

• Measuring Too Loosely: This is probably the most frequent mistake. People often don't pull the tape measure snug enough. If you can fit more than two fingers under the tape, it's likely too loose, and you'll end up with a helmet that's too big.
• Not Finding the Widest Point: If you measure around the forehead but miss the widest part of the back of the head, your measurement will be smaller than it should be. This can lead you to purchase a helmet that feels tight or doesn't cover enough of your head.
• Ignoring Hair or Accessories: Wearing a thick bandana, hat, or having a voluminous hairstyle while measuring can add extra inches to your circumference. This can result in buying a helmet that feels okay initially but becomes too tight once you put on your usual headwear.
• Using a Stiff Tape Measure: A rigid tape measure won't conform to the natural curves of your head, leading to an inaccurate reading. Always use a flexible soft measuring tape or string.

How to Tell If a Helmet Actually Fits

Your measurement is just the first step; trying on the helmet is where the real fit test happens. A helmet should feel snug all around your head, without any noticeable pressure points or "hot spots." When you shake your head gently from side to side and front to back, the helmet should not shift excessively. Ideally, it should move with your skin, not freely on your head.

The helmet should sit level on your head, about one to two finger-widths above your eyebrows. If it sits too high, it won't protect your forehead adequately. If it sits too low, it might obstruct your vision or press uncomfortably on your nose.

Also, check that the straps adjust comfortably and securely, not pinching or chafing your skin.

Helmet Fit vs. Helmet Size

It’s important to understand that helmet size is based on circumference, but helmet fit involves more than just that one measurement. The internal shape of a helmet also plays a huge role. Some helmets are designed for rounder heads, while others are suited for more oval shapes.

Even if your head circumference matches the size chart, the helmet might not fit well if the internal shape doesn't align with the shape of your head.

This is why trying helmets on is essential. You might find that Brand A’s medium fits perfectly, while Brand B’s medium feels too tight or too loose. Manufacturers might describe their helmet shapes as "round oval," "long oval," or "intermediate oval." Your head shape will dictate which specific helmet models and brands will offer the best fit, regardless of pure circumference.

Frequently Asked Questions

How often should I measure my head for a helmet?

Measure your head if you're buying a new helmet or if you haven't bought one in several years. Head size can change over time due to weight fluctuations or aging.

Can I use a standard tape measure?

A soft, flexible measuring tape is best. A stiff tape measure won't contour to your head's curves, leading to an inaccurate reading. If you must use a stiff one, use a string first to get the circumference.

What if my measurement falls between two sizes?

If your measurement is on the border, it's generally recommended to try the smaller size first. A helmet that's too large is a safety concern. You can often adjust a slightly snug helmet with padding, but you can't expand a helmet that's too small.

Does helmet fit change after breaking it in?

Helmets don't really "break in" like shoes do. While the padding might compress slightly over time, the shell size remains fixed. A helmet should fit perfectly right out of the box.

What are the safety standards for helmets?

Helmets are tested and certified to meet various safety standards depending on the activity. For example, bicycle helmets in the US typically meet CPSC standards, while motorcycle helmets meet DOT or ECE standards. Always check for a certification sticker inside the helmet.