Using a round brush to blowout hair is one of the best ways to get a smooth bouncy blowout. Using the right size round brush is important to achieve the look you want. The bigger the brush you use, the more volume you will create. The smaller the round brush you use, the more curl you can create. But what is considered a big or small size round brush for you specifically will depend on the length of your hair. For instance – for a basic blowout, a 1 ¼″ size round brush would be small for someone with hair down to their chest, but perfect for chin length hair.

When it comes time to blowout your hair think about what style you want to achieve. If you have long hair and want to have a lot of curl in your hairstyle you are going to want to you a smaller size round brush. Here is a guide to help you know what size round brush to use for your hair length to achieve the hairstyle you want.

Round Brush Size Guide

Round Brush SizeHair Length Best Round Brush
1" Pixie CutMoroccanoil 1inch round brush
1 1/4" To 1 1/2"2" To ChinOlivia Garden Round Brush 114

olivia garden round brush 112
1 3/4" Chin To Chestmoroccanoil 45mm round brush
2" Chest And Longersam villa round brush

 A good rule of thumb here is, if you want more curl go down a size from your standard size according to your length. To get a straighter, more voluminous hairstyles go up a size up from your standard size round brush for your hair length.

If you’re looking for more help on this subject, check my other posts: Best Round Brush For Blowouts, Best Hairbrush Breakdown, The Right Hairbrush For The Right Job.