Perm for a Man

A: Absolutely, men can perm their hair, and it's become increasingly popular in recent years. While perms were once viewed primarily as women's hair treatments, this perception has evolved dramatically over time.
Today, men's perms have made a strong comeback, with styles ranging from loose beach waves to tighter curls. Celebrities and many K-pop stars have helped normalize and popularize permed styles for men across different cultures and age groups.
The minimum length requirement for a perm depends entirely on the size of curl you're hoping to achieve. For a perm to work effectively, your hair needs to be long enough to wrap around the perm rod at least one to one-and-a-half times. Without sufficient length, the chemical process won't create a defined curl pattern.
For very tight curls using the smallest perm rods, you'll need hair that's at least one-and-a-half inches (4 cm) long. Medium-sized curls typically require around three inches (8 cm) of hair length. If you're going for looser waves or larger curls, your hair should be approximately five to six inches (13 to 15 cm) long. Specialty tools for creating very large, flowing waves might require even greater length.

Keep in mind that perms involve chemical processing that permanently changes your hair structure until it grows out, so it's not a decision to make lightly.
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See also:
Perm and perming hair
How to know what size of perm rods you need
How much does hair shrink when you get a perm?