Although a perm is a chemical treatment, it actually isn't as expensive as you may think. While a Keratin treatment to straighten locks can cost upwards of $600, a perm can cost you a fraction of that price, depending on the length of your hair. According to Healthline, most people can expect to pay around $30 to $150 for their perm, although many experienced stylists may charge a decent amount more. The big range in price is because the more hair you have, the more you can expect to pay. To get a clearer idea of the price, those with short hair can expect to shell out up to $150 while those with medium or long hair should budget for a few hundred dollars, plus tip.