How fast does hair grow?

Human hair grows at an average rate of about 1.25 centimeters (0.5 inches) per month, or approximately 15 centimeters (6 inches) per year. However, this rate varies significantly based on genetics, age, hair type, health, and lifestyle factors. Hair growth occurs in cycles, with each follicle going through growth (anagen), transition (catagen), and resting (telogen) phases. The anagen phase, when hair actively grows, typically lasts 2-7 years.

Several biological factors influence growth speed. Straight hair tends to grow slightly faster than curly or coily hair because sebum (natural oils) travels down the hair shaft more easily, keeping it moisturized and less prone to breakage. Coily hair often appears to grow slower due to shrinkage—the hair coils back on itself, making actual length gains less visible. Age also plays a role: hair grows fastest during teenage years and early adulthood, then gradually slows after age 30.

Tool description

This Hair Growth Calculator estimates how long it will take to grow your hair from its current length to your desired length. By considering your hair type, age range, and overall health and lifestyle factors, the calculator provides personalized growth projections including monthly and yearly growth rates, total time needed, and an estimated target date.

Examples

Example 1: Growing out a pixie cut

  • Current length: 5 cm
  • Target length: 25 cm (shoulder length)
  • Hair type: Straight
  • Age: 25 (18-30 range)
  • Health: Good

Result: Approximately 16 months to reach target length

Features

  • Dual measurement units: Switch between centimeters and inches based on your preference
  • Hair type consideration: Accounts for different growth patterns of straight, wavy, curly, and coily hair
  • Age-adjusted calculations: Factors in how hair growth naturally slows with age