Hair Growth Chart: Month-by-Month Hair Growth in CM & Inches

Scalp hair grows at roughly 1 cm (about 0.4 inches) per month as a practical clinical average. That works out to about 3 cm in three months, 6 cm in six months, 9 cm in nine months, and 12 cm in one year.

That math is useful if you want to estimate length. It becomes less useful if you are trying to judge recovery after telogen effluvium. A hair growth chart measures the length of a shaft that is already growing. Telogen effluvium adds a separate problem: many follicles changed phases at roughly the same time, shedding is delayed after the original trigger, and cosmetic density takes longer to recover than individual hair length.

Hair Growth Chart: 1 to 24 Months

This is the clean reference most people are looking for. It uses 1 cm per month so the numbers are easy to understand. The inch figures are conversions, rounded to one decimal place.

If your goal is to estimate when your existing hair will reach a specific length, use the hair growth calculator. This page answers a different question: how much length is produced over time, and why that number does not perfectly predict visible telogen effluvium recovery.

How Fast Does Hair Actually Grow?

A widely used dermatology reference is approximately 0.3 mm per day, or 1 cm per month. That is a useful baseline, but human hair does not grow at one universal speed. Studies measuring scalp hair in different populations have found meaningful variation by individual, geographic ancestry, hair diameter, age, and scalp site.

That is why this page uses 1 cm per month as a reference rate, not a normality test. Growing somewhat faster or slower does not, by itself, mean something is wrong.

Hair Growth Per Day, Week, Month, and Year

Hair Growth Time Chart vs. Telogen Effluvium Recovery Timeline

This distinction is the most important part of the page.

A hair growth time chart answers: "If this strand is already growing, how long could it become in X months?" A telogen effluvium recovery timeline answers: "When did the trigger affect the cycle, when did shedding appear, when are follicles returning to anagen, and when will density look better?" Those are related questions, but they are not interchangeable.

For the broader biological sequence, use our telogen effluvium timeline. If you are still trying to work out whether the shedding phase is ending, see when telogen effluvium stops.

Why Regrowth Can Look Slower Than the Chart

The chart measures length. Your mirror measures something much more complicated: coverage, contrast between scalp and hair, shaft diameter, styling, hair direction, part width, breakage, and the number of follicles actively producing visible hairs.

1. New Length Does Not Immediately Equal New Density

A newly growing 2 cm hair and a mature 30 cm hair both count as one hair, but they do not contribute the same visual volume. Short hairs may stand upright, separate from the surrounding hair, or fail to cover the scalp in the same way longer hairs do.

This is why you can have genuine regrowth and still feel that density has not changed. The biology may be improving before the hairstyle looks improved.

2. Telogen Effluvium Is a Cohort Problem, Not a Speed Problem

In telogen effluvium, an unusually large group of follicles shifts out of anagen within a similar window. Shedding is therefore more synchronized than normal background shedding. Recovery is not perfectly synchronized, however, and individual follicles do not all restart on the same date.

The practical result is a mix of old long hairs, recently shed follicles, newly growing hairs, and short regrowth of different lengths. A single "months since shedding" number cannot describe all of them.

3. Early Regrowth Can Look Fine Without Being Miniaturized

Short regrowth can look softer or finer simply because it is new, short, tapered, and surrounded by much longer terminal hairs. But there is an important distinction: progressively miniaturized hair shafts are not something you should automatically label as normal telogen effluvium recovery.

In uncomplicated telogen effluvium, dermatologic evaluation generally does not show the patterned miniaturization that defines androgenetic alopecia. If new hairs remain increasingly fine, your part continues to widen, or you see a patterned loss developing, review our comparison of telogen effluvium vs. androgenetic alopecia.

4. Breakage Can Erase Length Even When the Follicle Is Growing Normally

A follicle can produce 1 cm of new shaft in a month while the ends lose a similar amount to breakage. In that situation, scalp growth is happening but total visible length barely changes.

If you see many short pieces without a club-shaped root, irregular snapped ends, or damage concentrated in chemically treated areas, compare the pattern with our guide to telogen effluvium vs. hair breakage. If the strands are shedding from the root and you keep noticing a pale club at one end, our guide to white bulb hairs explains what that finding does and does not mean.

What About Kenogen?

This nuance matters because it keeps the page useful without pretending the biology is more predictable than it is.

How Much Does Hair Grow in 3, 6, 9, and 12 Months?

How Much Does Hair Grow in 3 Months?

Using 1 cm per month, about 3 cm or 1.2 inches. If you are tracking regrowth after telogen effluvium, three months of shaft growth does not necessarily mean three months since the trigger or three months since shedding started. It means that particular hair has been actively growing for roughly three months.

How Much Does Hair Grow in 6 Months?

About 6 cm or 2.4 inches at the reference rate. At this length, short new hairs can be very noticeable because they still do not blend with long surrounding hair. This is often when people notice a visible "halo" of shorter strands.

If you are unsure whether those short hairs are healthy regrowth or breakage, see our guide to short regrowth hairs.

How Much Does Hair Grow in 9 Months?

About 9 cm or 3.5 inches. This is one of the exact questions your current calculator has already been ranking for, and it deserves a direct answer. Nine centimeters is enough length for many new hairs to begin lying flatter and blending more easily, but it is not a universal point at which telogen effluvium density must look normal.

How Much Does Hair Grow in 12 Months?

About 12 cm or 4.7 inches. Many people round that to about 5 inches per year. Clinical reviews of telogen effluvium note that cosmetically significant regrowth can take considerably longer than the active shedding phase, sometimes reaching the 12 to 18 month range. That is compatible with normal shaft growth because cosmetic recovery depends on more than length alone.

How Much Does Hair Grow in 18 or 24 Months?

At the same reference rate, approximately 18 cm (7.1 inches) in 18 months and 24 cm (9.4 inches) in two years. Long-hair recovery can take this long simply because replacing lost length is slow even when the follicles themselves are functioning normally.

Does Hair Grow Back Faster After Telogen Effluvium?

Do not assume it does.

Once a follicle is back in anagen, the new shaft generally follows the same biology that governs ordinary scalp-hair growth. What can look like "fast regrowth" is the sudden visibility of many short hairs within a similar period, not necessarily each individual hair growing at an unusually high millimeter-per-day rate.

More importantly, telogen effluvium recovery is usually about restoring normal cycling and resolving the trigger, not trying to force an abnormally high shaft-growth speed.

What Actually Changes Hair Growth Rate?

There is real variation, but it is easy to turn that fact into overconfident advice. The most useful way to think about the evidence is this:

• Individual biology matters. Growth rates vary naturally even in healthy adults.
• Age can matter. Hair characteristics, including growth and diameter, change with age.
• Population-level differences exist. Large studies have measured differences in average growth rate across geographic ancestry groups. Those are group averages, not rules for an individual person.
• Hair diameter and growth rate can correlate. Some studies find thicker shafts associated with faster measured growth.
• Scalp location can differ. Measured growth is not perfectly identical at every scalp site.
• Severe nutritional or medical problems can interfere with healthy hair production. Correcting an actual trigger or deficiency is more important than trying to exceed a normal growth rate. Two common issues worth understanding are iron deficiency or low ferritin and thyroid-related hair loss.

If you are recovering from shedding, focus first on whether the underlying trigger has been addressed. Our telogen effluvium causes hub covers the common physical, hormonal, nutritional, medication-related, and stress-related triggers.

What Does Not Reliably Make Hair Grow Faster?

Trimming does not make follicles grow faster. Cutting the end of the shaft cannot signal the follicle under your scalp to increase its growth rate. Trimming can still help you retain length by removing damaged ends before they split farther.

Likewise, oils, rice water, brushing routines, and cosmetic shampoos should not be presented as proven ways to materially accelerate millimeters of scalp-hair growth per day.

Scalp massage is a good example of why precision matters. A small study reported an increase in hair thickness after standardized massage, but did not find a significant increase in hair growth rate. "Hair looks healthier" and "hair grows faster" are not the same outcome.

Minoxidil also deserves more nuance than a blanket statement. It can alter hair cycling, shorten telogen, promote entry into anagen, prolong anagen in some models, and increase follicle size. Some literature also reports growth-rate effects. It is a treatment with potential benefits and side effects, not evidence that every topical product can speed growth. If you are considering treatment specifically for telogen effluvium, use our guide on how to support regrowth and discuss medication decisions with a clinician.

How to Measure Hair Growth Without Fooling Yourself

Hair grows slowly enough that bad measurement can create more anxiety than useful information. A one-week comparison is especially noisy because the expected change is only a few millimeters.

1. Choose one small reference area. Use the same part line, hairline point, or clipped section each time. Do not switch scalp locations between measurements.
2. Measure the same hair state. Compare dry hair with dry hair. Wet hair clumps and changes apparent density.
3. Use the same lighting and camera angle. Overhead lighting can make the scalp look dramatically more visible even when density has not changed.
4. Include a ruler when measuring length. A photo without scale is poor evidence of a 1 cm difference.
5. Track monthly, not daily. One month gives you a meaningful unit. Daily checks mostly measure lighting, styling, and anxiety.
6. Compare wider intervals. Month 1 vs. month 4 is more useful than Monday vs. next Monday.

You can also use consistent photographs to monitor overall coverage. Our telogen effluvium pictures guide explains what to look for and why lighting matters.

How to Read Regrowth Without Over-Interpreting It

Short hairs are usually encouraging when they are distributed through areas that previously shed, continue gaining length, and are not accompanied by progressive patterned thinning.

But one snapshot cannot tell you whether a 3 cm hair is three months old, whether it broke at 3 cm, whether it started later than nearby follicles, or whether underlying pattern hair loss is changing shaft diameter.

This is why the best recovery assessment combines several signals:

• Is excessive shedding trending down over time?
• Are short hairs gaining length rather than repeatedly snapping?
• Is the overall pattern diffuse rather than increasingly patterned?
• Is your part stable or gradually improving in standardized photos?
• Has the original trigger been identified and corrected where possible?
• Are there scalp symptoms or systemic symptoms that warrant evaluation?

If you are not sure whether your overall pattern fits telogen effluvium, the telogen effluvium diagnosis hub explains the clinical history, scalp exam, hair-pull testing, and targeted labs that may be used.

When the Hair Growth Chart Is Not the Right Tool

Persistent shedding may require a closer look at chronic telogen effluvium, ongoing triggers, or an overlapping diagnosis. You can also use the telogen effluvium specialist directory to find dermatologists with hair-loss expertise.

Frequently Asked Questions