Hair Growth Calculator

How Much Will Your Hair Grow?

Our hair growth calculator helps you estimate how long your hair will grow over a given period. Based on the average hair growth rate of 0.5 inches per month, you can plan your hair growth journey whether you are growing out a haircut, preparing for a special occasion, or simply curious about your hair's potential length.

Hair grows in cycles with three phases: anagen (the active growth phase lasting 2-6 years), catagen (a transitional phase of about 2 weeks), and telogen (a resting phase of about 100 days). At any given time, different hairs on your scalp are in different phases, which is why you always have some hair shedding and some growing.

Several factors influence how fast your hair grows including genetics, sex, age, nutrition, and stress levels. The calculator uses the average rate, so your results may vary based on these individual factors.

How to Use the Calculator

Choose from three calculation modes:

• Growth from time — Enter a time period to see how much your hair will grow in that duration.
• Time for desired length — Enter how much length you want to gain, and we will tell you how long it will take.
• Final length — Enter your current hair length and a time period to see your final length.

You can switch between inches, centimeters, and millimeters for length, and between months, years, and days for time.

The Formula

The average hair growth rate is 0.5 inches per month. The formula is simple:

L = 0.5 × t

Where L is the length gained in inches, and t is the time in months. For metric units, the equivalent rate is 1.27 cm or 12.7 mm per month.