How Fast Does Hair Grow? Per Month, Per Year, and After Hair Loss

This page explains the hair cycle in plain words, how much hair grows in a month, and how long it takes for hair to grow back after shedding, a buzz cut or hair loss treatment. We do not give doses. For a timeline on your own scalp, ask a dermatologist.

How much does hair grow in a month?

About half an inch, or a little over one centimetre, for healthy scalp hair. That is an average. Growth speed varies from person to person and from one part of the scalp to another.

A large study of 2,249 young adults from 24 ethnic groups measured growth on three areas of the scalp. It found "differences linked to scalp area, gender and geographic origin" (Loussouarn et al., Eur J Dermatol 2016, PubMed, read 14 Nov 2026). It reported that "Asian hair showed a thicker diameter, with faster growth" and described African hair as having "a slower growth rate". So your own pace may be a bit faster or slower than half an inch.

These are round numbers for planning a haircut, not measurements of your own hair.

The hair cycle: why hair does not grow forever

Each hair grows from a follicle, a small pocket in the skin. Every follicle runs through a cycle on its own schedule. DermNet, a skin reference written by doctors, describes three stages (DermNet: male pattern hair loss, read 14 Nov 2026):

• Growing (anagen). DermNet says "The growth period, called the anagen phase, lasts for two to six years." It adds "About 90% of all scalp hairs are in the anagen phase at a given time."
• Switching off (catagen). A short transition. DermNet says it "lasts 1–2 weeks." The base of the root shrinks.
• Resting (telogen). DermNet says it "lasts for three months." Then the old hair falls out and a new one starts to grow in its place.

The length of the growing stage sets how long your hair can get. If a hair grows for three years at half an inch a month, it can reach about 18 inches before it falls out. That is why some people can grow hair to their waist and others cannot get past their shoulders.

How many hairs fall out each day

Losing some hair every day is normal. It is the resting stage finishing. The American Academy of Dermatology says "It's normal to shed between 50 and 100 hairs a day" (AAD: hair loss or shedding, read 14 Nov 2026). MedlinePlus gives a wider range and says the scalp holds about 100,000 hairs.

How long does it take for hair to grow back?

It depends on why it is gone.

After a haircut or a shave

Hair cut short keeps growing at the normal pace, about half an inch a month. At that pace, three months adds about an inch and a half. Shaving cuts hair at the skin and leaves the root, where growth happens, alone.

After shedding from stress, illness or weight loss

This is called telogen effluvium. Many hairs switch to the resting stage at once after a shock to the body, then fall out a few months later. The AAD says that as the body readjusts, "the excessive shedding stops. Within six to nine months, the hair tends to regains its normal fullness" (AAD: hair loss or shedding). New hairs then need time to grow long, so full length takes longer still. Our diffuse thinning guide covers this kind of shedding.

After patchy hair loss (alopecia areata)

The AAD says that with treatment "it's possible to see some regrowth in 6 weeks. However, it takes months for full regrowth" (AAD: alopecia areata, read 14 Nov 2026). Regrown hair may come in white or fine at first. See our alopecia areata guide.

After starting treatment for male pattern hair loss

Pattern hair loss works differently. The roots shrink with each cycle and make thinner, shorter hairs. Treatment can slow this, and some hairs thicken again. But each hair still has to pass through its cycle, which is why results take months.

The over-the-counter minoxidil label says "Results may occur at 2 months with twice a day usage. For some men, you may need to use this product for at least 4 months before you see results" (DailyMed: Men's Rogaine Extra Strength label, read 14 Nov 2026).

For finasteride, MedlinePlus says "it may take at least 3 months before you see any improvement because hair loss and growth happen slowly over time" (MedlinePlus: finasteride, read 14 Nov 2026). The AAD says that if finasteride helps, "you will start to see results in about 6 months" (AAD: male pattern hair loss treatment, read 14 Nov 2026). A fair verdict takes about a year. Our finasteride timeline and minoxidil shedding timeline go month by month.

Some men shed more in the first weeks of minoxidil. That is old resting hairs falling out early as new ones start. It usually settles.

Can you make hair grow faster?

The approved hair loss drugs are not labelled to make each healthy hair grow faster. What you can affect is how much hair is in the growing stage and how long it stays there.

The AAD's list of causes of hair loss includes too little iron, protein, zinc or biotin. It says hair can regrow once the body gets enough of the missing nutrient. Taking extra when you already have enough is a different matter and has little evidence behind it. A blood test can show whether you are low.

For men with pattern hair loss, the drugs that help keep more hairs growing are finasteride and minoxidil. They do not speed up each hair; they slow the shrinking that stops hairs from growing. Our male pattern baldness guide compares them.

Why thinning hair stays short

The growing stage tends to shorten in men with pattern hair loss, because DHT, a male hormone, cuts it short. DermNet says DHT is believed to shorten the growth phase "from a usual duration of 3–6 years to just weeks or months" in the affected areas. That is why hair on a thinning crown stays short and fine even if you never cut it.

What hair loss treatment costs

Generic finasteride starts at $0.83 a tablet at Strut Health. The cheapest hair loss plan we track is Keeps at $14 a month, checked November 14, 2026. Every plan and its source is on our hair loss price page.