Do you want your curls to look better than they are? The problem may lie with your curling iron barrel. Not all barrels are created equal, and finding the perfect size for your hair type and desired style is essential.

If you’re searching for the perfect curling iron, one essential factor to consider is the barrel size. The barrel size determines the type of curls you can achieve, whether you desire loose waves or tight ringlets. But how do you measure the curling iron barrel accurately?
In this guide on how to measure curling iron barrel, we will walk you through the steps to measure the barrel size of a curling iron, empowering you to make an informed choice when selecting the ideal tool for your desired hairstyle. Let’s dive in and unravel the mysteries of curling iron barrel measurement.
What Are the Benefits of Measuring Curling Iron Barrel?
Measuring the curling iron barrel has several benefits, including:
- Achieving Desired Curls: As mentioned earlier, the barrel size is crucial in determining the type of curls you can achieve. By accurately measuring the curling iron barrel, you can select one that best suits your hair type and desired style.
- Avoiding Damage to Hair: Using a curling iron with an incorrect barrel size can cause heat damage to your hair. By measuring the barrel size beforehand, you can ensure it’s suitable for your hair and minimize potential damage.
- Saving Time and Money: Buying a curling iron with an unsuitable barrel size may result in less-than-desired results, leading to frustration and needing a different curling iron. By measuring the barrel size accurately, you can avoid wasting time and money on unsuitable tools.
What Will You Need?
To measure the curling iron barrel, you will need:
- A ruler
- Measuring tape
- Curling iron (obviously)
Once these items are ready, follow the steps below to accurately measure your curling iron barrel.

8 Easy Steps on How to Measure Curling Iron Barrel
Step 1: Gather Your Tools
Before you begin measuring the curling iron barrel, ensure you have all the necessary tools. Here’s what you’ll need:
- Ruler: A ruler helps you accurately measure the curling iron barrel’s diameter or circumference. Choose a ruler with clear markings for precise measurements.
- Measuring Tape: If your curling iron has an irregular shape or a tapered barrel, a measuring tape can help obtain accurate measurements.
- Curling Iron: Of course, you’ll need the curling iron itself. Ensure it’s clean and free from hair products or residue before measuring.
Having these tools ready will enable you to effectively measure your curling iron barrel, ensuring that you select the right size for your desired curls or waves.
Step 2: Determine the Barrel Diameter
To determine the diameter of your curling iron barrel, you have a few options:
- Measure Across the Opening: Place your ruler or measuring tape across the opening of the curling iron barrel. Measure from one edge of the barrel’s opening to the opposite edge, keeping the measuring tool straight and level. This measurement will give you the diameter of the barrel.
- Measure the Circumference and Divide: If you have already measured the circumference of the barrel in step 3 (using a measuring tape or math formula), you can divide that measurement by π (pi = approximately 3.14) to calculate the diameter. The formula is: diameter = circumference / π.
Once you have determined the diameter of your curling iron barrel, you will have a crucial measurement that will help you select the right size for achieving your desired curls or waves.
Step 3: Calculate Barrel Circumference
To calculate the circumference of your curling iron barrel, you can use either a measuring tape or a math formula:
- Measuring Tape: Wrap a measuring tape around the thickest part of your curling iron barrel and note where it meets again. This measurement is the circumference of your barrel.
- Math Formula: If you know the barrel’s diameter (calculated in step 2), you can use this formula to calculate the circumference: circumference = diameter x π.
Knowing the circumference of your curling iron barrel will give you an accurate measurement that can help determine which size is best for achieving your desired curls or waves.
Step 4: Identify Barrel Shape
Identifying the shape of your curling iron barrel is crucial as it determines the type of curls or waves you can achieve. There are typically three common barrel shapes:

- Cylinder Barrel: This is the most common barrel shape, providing versatile styling options for creating tight curls and loose waves. It delivers uniform heat distribution and consistent results.
- Conical Barrel: A conical barrel is narrower at one end and wider at the other, resembling a cone shape. This design allows for more versatility in creating different curl sizes, from tight curls at the narrow end to looser waves at the wider end.
- Reverse Conical Barrel: The reverse conical barrel has a broader base and narrows towards the top. This shape is ideal for creating voluminous curls at the roots and looser waves towards the ends, giving a more natural-looking result.
Understanding the shape of your curling iron barrel will help you select the right tool to achieve the specific curl or wave style you desire. Experimenting with different barrel shapes can offer various styling options to suit your preferences and create stunning hairstyles.
Step 5: Measure the Length of the Barrel
The length of the barrel is another essential measurement to consider when selecting a curling iron. It determines how much hair you can curl at one time and plays a significant role in achieving your desired style.
To measure the length of your curling iron barrel, follow these steps:
- Place Your Ruler: Place your ruler on top of the barrel, starting from where it meets the handle.
- Measure to Tip: Measure to the tip of the barrel, noting where it ends. This measurement will give you an accurate length for your curling iron barrel.
Knowing the length of your curling iron barrel will help you determine how much hair you can curl at once, allowing you to achieve your desired style more efficiently.
Step 6: Determine the Width of the Barrel
The width of the barrel also plays a crucial role in achieving your desired style. It determines how tightly or loosely your curls will be formed and how much volume they will have.

To determine the width of your curling iron barrel, follow these steps:
- Place Your Ruler: Place your ruler across the broadest part of the barrel (usually near the middle).
- Measure Across: Measure across to the opposite side, noting where it meets. This measurement will give you an accurate width for your curling iron barrel.
Knowing the width of your curling iron barrel will help you select the right size to achieve your desired curl or wave style and create a stunning hairstyle.
Step 7: Experiment and Have Fun
Now that you have learned the essentials of curling your hair with a curling iron, it’s time to embrace your creativity and have fun with different styles. Take the opportunity to experiment with various techniques, such as curling different sections of your hair in different directions or trying out different curling patterns.
Don’t hesitate to step out of your comfort zone and try new hairstyles. Remember, hairstyling is an art, and it’s all about expressing your unique personality and style. So, grab your curling iron, let your imagination run wild, and have a blast creating stunning looks that make you feel confident and beautiful.
Step 8: Explore Different Curling Techniques
Aside from the traditional method of wrapping your hair around the curling iron, there are other techniques you can try to achieve different types of curls or waves. Some popular methods include:
- Twisting: Instead of wrapping your hair flat around the barrel, twist small sections before wrapping them around for a more textured and beachy look.
- Clipping: Use butterfly clips to clip each curl after removing it from the curling iron. This will help set the shape and create bouncier curls.
- Braiding: Braid sections of damp hair and use a blow dryer or flat iron to heat the braids before unbraiding them for loose waves.
Experimenting with different curling techniques can give you various looks and help you discover your favorite methods for achieving your desired style.
Following these steps, you can confidently select the perfect curling iron size and shape for your hair type and desired style.

5 Things You Should Avoid
Here are five things you should avoid:
- Estimating with the Naked Eye: Relying on visual estimation alone can lead to inaccurate measurements. It’s essential to use precise measuring tools, such as a ruler or tape, to get the most accurate results.
- Neglecting to Account for Tapered Barrels: Tapered barrels are wider at the base and narrower at the tip. When measuring a tapered curling iron barrel, it’s essential to measure the widest part for consistency and accuracy.
- Ignoring the Measurement Unit: Different regions may use different measurement units, such as inches or millimeters. Use the appropriate unit consistently to avoid confusion and ensure consistent measurements.
- Failing to Account for Heat-Resistant Materials: Some curling irons have heat-resistant materials, like silicone, coating the barrel. When measuring, measure the actual metal barrel and exclude any additional heat-resistant materials.
- Overlooking Barrel Shape: Curling iron barrels come in various shapes, including cylindrical, conical, and oval. Pay attention to the specific shape of the barrel when measuring to capture the size and dimensions accurately.
By avoiding these common mistakes, you can confidently measure curling iron barrels and make informed choices when selecting the right tool for your styling needs.

Conclusion
Curling your hair with a curling iron is a versatile and effective way to achieve beautiful curls or waves. By understanding the essential barrel size, length, and width measurements, you can select the perfect tool for your desired style. Experiment with different techniques and have fun creating stunning hairstyles that showcase your unique personality and style. Just remember to avoid common measurement mistakes for accurate results.
Hopefully, the article on how to measure curling iron barrel size has provided you with the information and tips you need to confidently select and use a curling iron for your styling needs.
Now go grab your curling iron and get ready to turn heads with your gorgeous curls! So why wait? Try out these tips today and unleash your inner hairstyling pro! Happy styling!
About the Author
Jane Hubbard is a passionate beauty expert with a wealth of experience in makeup, hair, and overall beauty techniques. After years of working as a hairdresser specialist, she followed her entrepreneurial spirit and started her own consultancy business.
Jane has always been driven by her desire to help others feel confident in their own skin, and she does this by sharing her knowledge, experiences, and practical beauty tips. Through her consultancy, she empowers individuals to embrace their unique beauty, offering tailored guidance that boosts both self-esteem and personal style.
Professional Focus
- Specializes in makeup, hairstyling, and beauty consulting.
- Provides personalized beauty advice, tips, and techniques to help individuals feel confident in their appearance.
- Dedicated to staying up-to-date with the latest industry trends and developments.
- Passionate about creating a comfortable and empowering experience for every client.
Education History
- University of Craft and Design – Bachelor of Fine Arts (BFA) in Woodworking and Furniture Design
- Woodworking Apprenticeships – Extensive hands-on training with skilled craftsmen to refine carpentry and furniture making techniques
- Online Courses & Masterclasses – Continued education in advanced woodworking techniques, design principles, and specialized tools
Expertise:
- Makeup artistry, hairstyling, and beauty consulting.
- Personalized beauty techniques to enhance confidence and self-expression.
- Educating clients on how to maintain their beauty routines at home.