* Curl Size: Tighter curls (like spiral perms) will make hair appear significantly shorter than looser waves.
* Hair Length: Shorter hair will experience a more dramatic change in length than longer hair. For example, a few inches of curls on shoulder-length hair can make a big difference, while the same curls on hair that reaches your waist might only seem a little shorter.
* Hair Texture: Fine hair tends to shrink more with a perm than coarse hair.
* Perm Type: Different perms create different levels of curl tightness.
* Technique and Application: The way the perm is applied and the rods used can affect the final length.
General Guidelines:
* Loose Waves: May not change the length much, perhaps 0-2 inches.
* Medium Curls: Can shorten hair by 2-4 inches.
* Tight Curls/Spiral Perms: Can shorten hair by 4-6 inches, or even more on shorter hair.
It's best to consult with a hairstylist before getting a perm. They can assess your hair type, discuss your desired curl size, and give you a realistic estimate of how much shorter your hair will appear after the perm. They may even be able to show you examples of similar perms on hair of a similar length and texture to yours. They can also suggest a perm technique and rod size that will achieve the desired look while minimizing shrinkage.