How to Pick the Right Curling Iron Size for Your Curl Goals

While you can grab just about any flat iron or blow dryer and achieve similar results when styling your hair, curling irons require a much more intentional process. Curling irons come in a range of sizes with each achieving a different sort of effect—from big, voluminous, barely-there waves to micro-curls that can enhance naturally curly or coily texture. Our curling iron size guide is here to help you figure out which size (or sizes) you should keep on deck. 

How to Choose a Curling Iron Size 

The size of your curling iron barrel definitely makes a difference in the way your hair is styled. Different barrel sizes create different looks and are beneficial for various hair lengths and textures. 

“For instance, if you have naturally curly hair or shorter hair and want to create smooth, textured curls or waves, I typically recommend a smaller barrel. Its smaller size enhances your natural curl or wave pattern, and it’s easier for those with shorter hair to wrap their hair around evenly,” explains Sarah Potempa, celebrity stylist and founder of the Beachwaver Co. This would be anywhere from a ⅜ to ¾-inch barrel. 

On the other hand, a large barrel curling iron—anywhere from a 1 to 2-inch circumference—is ideal for creating curls for those with medium to long hair. 

Another factor to keep in mind is how well your hair holds a curl. If you have fine or straight hair that struggles to hold a curl, you may want to go with a slightly smaller barrel than you think, as tighter curls will loosen over time. 

A Universally Flattering Curling Iron Size

When in doubt, a 1-inch curling iron provides the most versatility. “You can use it on both short and long hair by manipulating the hair differently,” explains Eddie M Parra, senior stylist at Benjamin Salon in New York City. “For example, on shorter hair you should take smaller sections to have more control over the curl pattern. Longer hair you can take smaller sections for tighter curls or bigger sections for looser curls.” 

Curling Iron Size Guide  

Following the above advice will help get you in the right ballpark on what size curling iron is best for your hair needs. For more help, refer to this curling iron size guide provided by Parra and Potempa. 

• 3/8 inch: This size iron is best for shorter hair with a result of super tight curls and/or kinky spiral curls, Parra says. This iron is best used by wrapping the hair around the rod.   
• 1/2 inch: Choose this curling iron size if you have short to medium hair and want a result of tight curls or kinky curls. This iron is best used by wrapping the hair around the rod. 
• 5/8 inch: This small curling iron size is also ideal for short to medium hair lengths, and it creates smooth soft curls. “You have flexibility on how you use this iron whether you wrap the hair around it or for a unified curl,” says Parra. 
• 3/4 inch: This is still on the smaller size, though we’re getting into more “medium” territory. Potempa says, “This barrel is excellent for enhancing natural curl patterns and creating a more textured, tousled look. It’s great for anyone looking to add definition and volume to their natural curl or wave.” 
• 1 inch: This size iron is best for all hair lengths and creates full curls and defined waves. You can either wrap the hair around it or use the clamp and a twisting motion.
• 1-¼ inch: “Ideal for glam waves, this barrel creates smooth, uniform, bouncy waves with a polished finish,” Potempa says. It’s perfect for those with medium to long hair looking for a more refined, voluminous wave. 
• 1-1/2 inch: This size iron is best for longer hair lengths and creates large, loose waves. It’s perfect for those looking for a more refined, voluminous style. 
• 2-inch: This size is best for longer hair lengths. Potempa says, “Great for a blowout look, this size creates loose, bouncy waves that give your hair volume and texture. For an even bouncier finish, I recommend pinning the curls and letting them set before styling.”