Home Hair Growth Tips Hair Growth Calculator: How Fast Does Hair Grow?

Hair Growth Calculator: How Fast Does Hair Grow?

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Do you want to know how long your hair will be at specific times in the future? Even though predicting future hair length can be challenging, it is always feasible to make an educated guess. This is the place you need to go if you’re interested in knowing your hair growth potential or are serious about growing your hair to a specific length.

You can use the hair growth calculator on this website to get an idea of how long your hair will be after a certain amount of time by utilising a hair growth formula. Additionally, we’ll discuss the stages of hair growth and variables that affect your typical hair growth rate using research-based knowledge.

Learn about the hair cycle

You might say that some of your hair is constantly sprouting. All of the hair on your head goes through a development cycle in which it grows, changes, rests, and finally sheds, ending up in your shower drain and styling equipment.
About 85 to 95 percent of your hair follicles are in the growth stage at any given moment, with the remaining ones in one of the other stages. The stages of the hair growth cycle are covered below:

Note: While four separate hair development phases are acknowledged by some experts, others only see three. We will concentrate on all four.

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The term “hair growth cycle” refers to the natural process that hair goes through as it grows, rests, and sheds. Understanding this cycle can help you better care for your hair and address any concerns related to hair growth. The hair growth cycle consists of three main phases:

  1. Anagen Phase (Growth Phase):
  • This is the active phase of hair growth.
  • Hair follicles are actively producing new hair strands.
  • The duration of the anagen phase varies among individuals and can last anywhere from two to seven years.
  • The longer the anagen phase, the longer the hair can grow.
  1. Catagen Phase (Transition Phase):
  • This is a transitional phase where hair growth slows down.
  • The hair follicle begins to shrink, and the hair strand detaches from the blood supply.
  • The catagen phase typically lasts for a few weeks.
  1. Telogen Phase (Resting Phase):
  • In this phase, hair growth has stopped, and the hair is fully formed but not actively growing.
  • The hair strand is anchored in the follicle but not connected to the blood supply.
  • The telogen phase can last for several weeks to a few months.
  1. Exogen Phase (Shedding):
  • Some sources consider the exogen phase as a subphase of the telogen phase.
  • During exogen, old hair is shed to make way for new hair growth.
  • On average, people shed about 50 to 100 hairs per day.

After the exogen phase, the hair follicle re-enters the anagen phase, and the cycle begins again.

It’s important to note that not all hair follicles are in the same phase at the same time. This staggered cycle is why you typically don’t lose all your hair at once. Factors such as genetics, age, health, and hormones can influence the duration and strength of each phase.

If you’re concerned about hair growth, it’s essential to maintain a healthy lifestyle, including a balanced diet, regular exercise, and proper hair care practices. Additionally, consult with a healthcare professional or dermatologist if you have specific hair growth concerns or if you notice sudden or excessive hair loss, as it could be a sign of an underlying medical condition.

How Quickly Do Hairs Grow?

Now that you are more knowledgeable about the stages of the hair growth cycle, let’s move on to the topic you are probably most curious in: how quickly does hair grow? Healthy hair typically grows six inches a year, or half an inch every month.

Factors That Influence Your Hair Growth

The rate at which hair grows can vary from person to person and depends on several factors, including genetics, age, overall health, and even ethnicity. On average, hair growth occurs at a rate of approximately:

  • Half an inch (1.25 centimeters) per month: This is the standard estimate for most people.
  • About 6 inches (15 centimeters) per year: On average, hair can grow about six inches in a year.

Keep in mind that these are general averages, and individual hair growth rates can deviate from this norm. Here are a few factors that can influence how fast hair grows:

  1. Genetics: Your genetic makeup plays a significant role in determining your hair growth rate. If your family tends to have faster or slower-growing hair, you may inherit those traits.
  2. Age: Hair growth tends to slow down as people age. This means that younger individuals may experience faster hair growth than older ones.
  3. Overall Health: Good overall health, including a balanced diet and proper hydration, can support faster hair growth. Nutritional deficiencies or health conditions can slow it down.
  4. Hormones: Hormonal changes, such as those that occur during pregnancy or menopause, can affect hair growth. Hormonal imbalances can lead to hair loss or changes in the growth rate.
  5. Hair Care Practices: Proper hair care, including regular trims to prevent split ends, can help maintain healthy hair, but it doesn’t significantly speed up hair growth.
  6. Stress and Lifestyle: High levels of stress and certain lifestyle factors, like smoking or excessive alcohol consumption, can have a negative impact on hair growth.

Remember that hair growth is a gradual process, and it can take time to see noticeable length changes. If you’re looking to promote hair growth or have concerns about hair loss, maintaining a healthy lifestyle, eating a balanced diet, and using gentle hair care practices can help optimize the growth potential of your hair. If you have specific concerns or experience sudden, significant hair loss, consult with a healthcare professional or dermatologist for personalized advice and potential treatment options.

Also Read: How to Use Clove Water For hair Growth

How to Calculate Hair Growth

Calculating hair growth involves measuring the length of your hair at different times and then determining the rate of growth over a specific period. Here’s a step-by-step guide on how to calculate hair growth:

Items You’ll Need:

  • Measuring tape or ruler
  • Pen and paper or a digital note-taking device
  • A clear and consistent starting point, such as a specific reference point on your scalp or a strand of hair to measure from


  1. Choose a Starting Point: Decide on a clear starting point for your hair measurement. This could be a specific reference point on your scalp or a particular strand of hair.
  2. Measure Your Hair Length: Use a measuring tape or ruler to measure the length of your hair from the chosen starting point. Be precise in your measurements. If you’re measuring from your scalp, make sure to measure from the same point each time for consistency.
  3. Record the Measurement: Write down or digitally record the measurement. Note the date and time of the measurement as well.
  4. Wait for a Set Period: Allow some time to pass, such as one month, two months, or more, depending on how long you want to measure your hair growth.
  5. Repeat the Measurement: After the set period, measure your hair length again using the same starting point and measuring method as before.
  6. Calculate the Growth Rate: To calculate the hair growth rate, subtract the initial hair length from the final hair length. Divide the result by the number of days or months that passed during the measurement period. This will give you the average daily or monthly growth rate.
  • For example: If your hair was initially 10 inches long and, after one month, it measured 10.5 inches, your hair growth for that month would be 0.5 inches. If you’re calculating the monthly growth rate, it would be 0.5 inches divided by 1 month, which equals 0.5 inches per month.
  1. Repeat as Desired: You can continue to measure your hair growth periodically to track its progress over time.

It’s essential to keep in mind that hair growth rates can vary from person to person and even from one part of your scalp to another. Factors like genetics, age, overall health, and hair care practices can all influence how fast your hair grows. Hair growth calculations provide an estimate, but individual results may differ.

Additionally, measuring hair growth can be more challenging with short hair or hair that’s layered, so consistency in your measurement method is crucial for accurate tracking.

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