
January 15, 2025
Determining your head circumference according to helmet size is an essential step in choosing a helmet that fits you properly and comfortably. The main purpose of a helmet is to protect your head, so you need to choose a helmet that fits your head in order to keep yourself safe. In this article, let's join Bigbike to learn how to determine your helmet size as accurately as possible.
Head circumference and helmet size
A helmet is considered an inseparable item for anyone traveling by two-wheeled or three-wheeled vehicles. Wearing a helmet that fits snugly around your head helps keep us safe and reduces the risk of injury should an accident occur.
How to measure your head circumference to choose the right helmet size
To choose a helmet in the correct size, you need to know your exact head circumference. Below is a detailed step-by-step guide to help you determine your head circumference:
- Step 1. Prepare a measuring tool: Use a tape measure to measure your head circumference. If you don't have a tape measure, you can use a piece of string and then measure it with a regular ruler.
- Step 2. Determine the measuring position: Place the tape measure around your head, about 2-3 cm above your eyebrows and around the back of your head, where the circumference is largest.
- Step 3. Measure your head circumference: Read the measurement on the tape measure; this is your head circumference.
Typically, an adult's head circumference ranges from 54 cm to 62 cm. However, this figure may vary depending on each person's head size.

How to measure head circumference and helmet size
Common helmet size chart
Manufacturers usually make helmets in sizes ranging from large to small: size S, size M, size L and size XL. These are the most common helmet sizes on the market today.
Size S helmet
A size S helmet usually fits those with a head circumference of 55-56 cm.
What head circumference is a size M helmet for?
Size M is usually suitable for a head circumference of 57 - 58 cm. This is a common size, suitable for both men and women.
How many cm is a size L helmet?
Size L is for people with a head circumference of 59 - 60 cm. This is a common size for men.
What head circumference is a size XL helmet for?
How many cm is a size XL helmet? A size XL helmet usually has a head circumference of 61 - 62 cm, for people with a larger-than-average head.
Choosing the right helmet for each head circumference
When choosing a helmet, picking the right size is extremely important. Below are some tips for choosing a helmet:
- Try the helmet on before buying: Always try the helmet on in person to make sure it fits your head.
- Adjust the chin strap: Make sure the strap is properly adjusted, neither too tight nor too loose.
- Check for comfort: Wear the helmet for a few minutes to check whether it feels uncomfortable or causes a headache.

How to choose a helmet that fits well?
Notes when choosing a helmet size by head circumference
When choosing a helmet, there are a few things you should keep in mind so that the helmet you buy can deliver its maximum effectiveness:
- Check the size periodically: Your head circumference can change over time, especially when you get a new hairstyle or wear additional accessories.
- Try the helmet on again after a while: A helmet may stretch out after a period of use. Check it and replace it if necessary.
- Don't choose a helmet that is too loose: Many people tend to choose a loose helmet so it doesn't feel hot or flatten their hair. A helmet that is too loose won't stay in place, creating danger in the event of a strong impact.
Frequently asked questions about helmet sizes
When choosing a helmet, customers often share a few common questions. Below are some answers to popular questions, which we hope can make your choice easier.
What size is a 60 cm head circumference?
With a head circumference of 60 cm, you should choose size L. This is a common size that is easy to find on the market.

Choosing the right helmet size helps keep yourself safe
How many cm is a size 7 helmet?
Size 7 is equivalent to a head circumference of about 56 cm, suitable for size S or M depending on the helmet style.
How many cm is a size 58 helmet?
Size 58 corresponds to a head circumference of 57 - 58 cm, suitable for size M.
What is a size L head? Defining size by head circumference
What is a size L head? A size L head usually falls within a circumference range of 59 - 60 cm. This is a common size, often seen in adults, especially men.
Choosing the correct helmet size not only provides comfort but also ensures maximum safety for the user. Measure your head circumference accurately and consult the size chart before deciding to buy a helmet. Don't forget to try the helmet on in person to make sure it fits and protects you best on every road.



