Wearing a properly fitted helmet is essential for safety when riding a motorcycle, bicycle, or participating in sports activities like football, hockey, rock climbing and more. Understanding your correct helmet size and how to measure for it properly ensures maximum protection. This comprehensive guide will walk through the step-by-step process for measuring helmet size using a tape measure or string.
Measuring Helmet Size with a Tape Measure
Using a flexible sewing measuring tape is one of the easiest and most accurate ways to determine your ideal helmet size. Follow these instructions:
Step 1: Locate Measuring Points on Head
- Have someone assist you or use a mirror for visibility
- Place the tape measure across your head about 1 inch above your eyebrows and ears
This will go horizontally all the way around the widest part of your head from front to back.
Step 2: Read Circumference Measurement
- Ensure tape is snug but not too tight
- Note the head circumference measurement in either inches or centimeters
This number will be used to identify helmet size. Write it down for easy reference.
Step 3: Convert Circumference to Helmet Size
Use the helmet sizing conversion chart below to find your approximate helmet size based on your head circumference measurement:
| Head Circumference | Helmet Size |
|---|---|
| 50–52 cm | S |
| 52–54 cm | M |
| 54–58 cm | L |
| 58–62 cm | XL |
Measure a few times to be sure of accuracy. Consult individual helmet brand sizing guides as well for their specific size charts.
Measuring Helmet Size with String
If you don’t have a measuring tape, using a length of non-stretch string or cord can also work for determining helmet size. Follow these instructions:
Step 1: Wrap String Around Head
- Have someone assist or use a mirror to see
- Wrap the string horizontally around head, about 1 inch above eyebrows and ears
- Ensure it’s snug but not too tight
Step 2: Mark String at Meeting Point
- Note where the two ends of the string meet in the back
- Make a small mark on the string at this meeting point
This is the head circumference length.
Step 3: Measure String Length
- Lay the marked string flat next to a tape measure or ruler
- Measure from one end to the head circumference mark
Write down this length measurement for the next step.
Step 4: Convert Length to Helmet Size
Use the conversion chart below to identify your approximate helmet size based on the string length measurement:
| String Length | Helmet Size |
|---|---|
| 19–20 inches | S |
| 20–21 inches | M |
| 21–22 inches | L |
| 22–24 inches | XL |
As before, double check accuracy and consult specific brand sizing charts too.
Tips for Getting Precise Helmet Size Measurement
Follow these tips for the most accurate sizing when measuring your helmet size:
- For adults, measure the widest part of your head above ears and eyebrows
- For kids, measure about 1 inch above eyebrows all around
- Keep measuring tape snug but not too tight
- Wear same hairstyle as when wearing helmet during measurement
- Measure a few times and average the results
- Consult individual manufacturer or brand sizing guides too
- Try on helmets in person for fit if possible
Getting an accurate measurement and properly fitted helmet can optimize protection and comfort.
Common Helmet Sizing Systems
There are a few different helmet sizing scales and systems used by different manufacturers:
Small/Medium/Large/Extra Large
The most common and simple sizing scale uses S/M/L/XL based on head circumference. Easy to determine based on measurement and chart conversion.
Inches or Centimeters
Some brands size helmets based on the numeric head circumference measurement in inches or centimeters. For example, “55 cm” helmet.
Numeric Size Ranges
Other systems use an incremental numeric range like 48-54 or 64-72 as the helmet sizes. Brand-specific conversion charts align these to measurements.
Fit Systems
Specialized or adjustable helmets use proprietary “fit systems” for getting the right custom size helmet rather than standard sizing.
While sizing scales vary, the fundamental head circumference measurement method remains the same. Check the brand’s specific sizing approach when selecting a helmet.
Special Considerations for Different Helmet Types
The helmet sizing measurement process may vary slightly by the helmet type or intended use:
Bike Helmets
- Measure about 1 inch above eyebrows around forehead for circumference
- Ensure tape measure or string stays level from front to back
- Helmet should sit low on head for maximum coverage
Football Helmets
- Measure approximately 1 inch above eyebrows as well
- But ensure tape or string follows contour over top of head from front to back
Rock Climbing Helmets
- Position tape/string about 1/2 inch higher on head than for other helmets
- This provides extra room for movement when looking up or down
While the general process stays the same, these nuances matter for safety and comfort across different helmet types.
Frequently Asked Questions About Measuring Helmet Size
How can I measure my head size if I have a lot of hair?
- Pull hair back into a ponytail or bun if possible while measuring
- Otherwise, press hair down towards scalp to get the tape or string as close to the actual head as possible
- Measure closer to the top of head near eyebrows versus lower down for less hair interference
What’s the best way to measure kids’ heads for helmet sizing?
For children, measure head circumference about 1 inch above the eyebrows all the way around for best accuracy. Use a flexible cloth measuring tape pulled snug but not overly tight. Distracting them or making it a game can help keep them still.
Is there a conversion between hat sizes and helmet sizes?
Not reliably. Hat sizes often use S/M/L sizing or numerical sizes that size the crown height rather than the head circumference at the widest point. Helmet fit is too important for safety to depend on hat sizing conversions.
Can I use online helmet sizing calculators instead of measuring myself?
Online calculators can provide an estimate but taking an actual measurement with tape, string or using a professional fitting is more accurate. Sizing calculators are good for getting in the ballpark if unable to measure head directly.
Should I measure my head before buying a new helmet online?
Definitely. Due to significant sizing variations between brands and models, getting your actual head measurement first is highly recommended for safely buying helmets online. Use this number to reference the brand’s specific sizing chart.
Conclusion
Finding your optimal helmet size involves carefully measuring your head circumference using a flexible tape measure or length of string. Position the measuring tool approximately 1 inch above the eyebrows while keeping it straight and snug all around your head. Convert this measurement to the standard helmet sizing scale like S/M/L/XL using the conversion charts provided. Consider nuances of different helmet types and manufacturers as well when selecting and fitting a helmet. Follow these tips and steps to safely obtain the ideal size helmet for protection and comfort.
Frequently Asked Questions
What is the main purpose of measuring your head to determine helmet size?
Measuring your head circumference helps determine the optimal helmet size that will fit snugly and provide maximal protection. An accurate and comfortable fit is essential for safety.
Where exactly should you position the tape measure or string when measuring for helmet size?
For most helmet types, the tape or string should be placed horizontally around the widest part of the head – about 1 inch above the eyebrows and ears all the way around.
How tight should the tape measure or string be when measuring head size?
It should feel snug and take into account any hair thickness, but not be uncomfortably tight. The goal is to get as close to the actual head size as possible.
What are some tips for getting an accurate helmet size measurement?
Tips include: measure a few times and average results, have someone assist you, pull hair back, use the same hairstyle as when wearing the helmet, and consult brand sizing guides.
If my head measures 22 inches in circumference, what helmet size should I get?
Based on a 22 inch circumference, you would typically need a size large (L) helmet according to most standard sizing conversion charts. But always confirm with the manufacturer’s specific sizing as well.