What is the Norwood scale?
The Norwood scale, also called the Hamilton-Norwood scale, is a way to classify male pattern baldness. Dr. James Hamilton described the first version in the 1950s. Dr. O'Tar Norwood revised it in 1975, using a study of 1,000 white adult men. He noted that the success of hair transplant surgery depends largely on choosing the right patients, which needs a reliable, shared way to describe hair loss.
The scale has seven main stages. Stage 1 is a full hairline. Stage 7 is the most advanced pattern. There are also variants, such as the "vertex" stage and the "type A" pattern, which describe loss that does not follow the usual route.
Doctors and patients use the scale to compare cases, follow progression and plan treatment. Your stage is also the first input for our hair graft calculator, which gives a rough graft range for your pattern.
The 7 Norwood stages at a glance
| Stage | What you usually see |
|---|---|
| Norwood 1 | No noticeable recession. A full, adolescent hairline. |
| Norwood 2 | Slight recession at the temples. Often called a mature hairline. |
| Norwood 3 | Deeper recession at the temples, giving an M, U or V shape. Usually the first stage considered balding. |
| Norwood 3 vertex | Hairline at stage 2 or 3, with thinning on the crown. |
| Norwood 4 | Further loss at the front and a larger bald area on the crown, separated by a band of hair. |
| Norwood 5 | The front and crown areas grow larger. The band between them becomes narrow and thin. |
| Norwood 6 | The band is gone. The front, top and crown form one bald area. |
| Norwood 7 | Only a horseshoe of hair remains at the sides and back, and it may be thin. |
Norwood stages explained in detail
Norwood 1 and 2: early changes
At stage 1 there is little or no sign of hair loss. At stage 2 the corners of the hairline move back a little. Many men reach stage 2 in their late teens or twenties, and some never progress further. A stage 2 hairline is not a disease on its own. It becomes relevant when there is a family history of baldness or the change is fast.
Norwood 3 and 3 vertex: when balding becomes visible
At stage 3 the temples recede deeply and the area is bare or nearly bare. Most doctors use this as the point where male pattern baldness is clearly present. In the 3 vertex variant, the front changes less, but a thin patch appears on the crown. Crown thinning is often noticed late, because you rarely see the top of your own head.
Norwood 4 and 5: the middle stages
At stage 4 the front has receded further and the crown patch is larger. A band of hair still runs across the top and separates the two areas. At stage 5 the band thins and narrows, and the bald areas come close to joining. These are the stages where many men start to look for a sapphire FUE hair transplant or another surgical option.
Norwood 6 and 7: advanced hair loss
At stage 6 the bridge of hair is gone, and the front, top and crown are one bald area. At stage 7 only a narrow horseshoe of hair remains around the sides and back. That band can also be thin. For transplant planning, the size and density of this remaining band matter more than the stage number.
Norwood class A: the front-to-back pattern
Some men lose hair in a different way. The hairline moves back evenly from the front, without a separate bald spot on the crown and without the usual M shape. Norwood called this the type A variant. It is marked with an "A", for example Norwood 3A or 4A.
Type A matters for planning. All the loss is concentrated at the front and top, which is the area that affects your appearance most. Because the crown is often less involved, a transplant can sometimes focus grafts where they make the biggest visible difference.
How to find your Norwood stage
You can get a rough idea of your stage at home. To do it well:
- Use dry hair, combed back, in daylight or bright, even light.
- Take photos from the front, both sides at 45 degrees, the top and the crown. Ask someone to take the crown photo.
- Compare your temples and crown with the stage descriptions above. If you sit between two stages, note both.
- Keep the photos. Taking new ones every 6 to 12 months in the same light shows whether your loss is stable or progressing.
A self-assessment has limits. A doctor examines the scalp with magnification to look for miniaturised hairs, which are thin hairs that are on their way out. This often shows that the area of loss is larger than it looks. The doctor also checks the donor area, which the Norwood scale does not measure at all.
How common is male pattern baldness by age?
Male pattern baldness is very common. In white men, about half are affected by age 50 and about 80% by age 70. Rates differ between ethnic groups. The condition is linked to genes and to dihydrotestosterone (DHT), a hormone made from testosterone. Sons of men with baldness have a much higher risk.
The speed of progression varies a lot. Some men stay at stage 2 or 3 for decades. Others move from stage 3 to stage 5 within a few years. Men whose hair loss starts early, in their teens or early twenties, often progress further over time. This is one reason surgeons are careful with young patients.
Treatment options by Norwood stage
The table shows common approaches for each stage. These are general patterns. Your own options depend on your age, donor area, hair type and how fast your loss is progressing.
| Stage | Common approach |
|---|---|
| Norwood 1–2 | Usually monitoring. If loss is starting, a doctor may discuss medical treatment. A transplant is rarely needed, especially in young men. |
| Norwood 3 and 3 vertex | Medical treatment, a transplant to the temples and hairline or crown, or both. The plan should allow for future loss. |
| Norwood 4–5 | A transplant is often considered for the front and top. Crown coverage depends on donor supply. Medical treatment may help protect native hair. |
| Norwood 6–7 | Depends on the donor area. The front and top usually come first. The crown may get lighter coverage or a second session. Some men choose not to have surgery. |
Medical treatment means medicines such as finasteride and minoxidil, which can slow loss in some men and need a doctor's supervision. Read our guide on finasteride and minoxidil after a hair transplant for how they work and their known side effects. For typical graft numbers at each stage, see how many grafts do I need.
Is a hair transplant right for my Norwood stage?
The stage alone does not decide this. A Norwood 3 in a 22-year-old is a very different case from a Norwood 3 in a 45-year-old whose loss has been stable for years. The younger man may still progress, and a low, dense hairline could look unnatural later.
At the other end, a Norwood 6 or 7 can still benefit from a transplant if the donor band is dense enough. The goal then is usually a natural frame for the face and good coverage on top. Full density on the crown is often not possible at these stages. Our guide on the crown hair transplant explains why the crown needs special planning.
Some people are better served by waiting or by medical treatment first. Read who is not a good candidate for a hair transplant for the most common reasons.
What the Norwood scale does not tell you
- Donor supply. Two men at the same stage can have very different donor areas, and that limits what a transplant can do.
- Hair characteristics. Thick, wavy hair covers more scalp than fine, straight hair. Low contrast between hair and skin colour also hides thinning.
- Diffuse thinning. Some men thin evenly across the top without a clear pattern. This can be harder to stage and to treat with surgery.
- Women. Female pattern hair loss usually looks different and is graded with other scales, such as the Ludwig scale. See our page on female hair transplant.
- Other causes. The scale only describes pattern baldness. See a doctor if your hair loss is patchy or sudden, comes out in clumps, or comes with itching, redness, scaling or pain, or if it started after a new medicine.
Find out your Norwood stage with a free analysis
Dr. Harun Alakaya plans each case himself and designs the hairline by hand. A good plan looks beyond the stage number: your age, how your loss has changed over time and the density of your donor area all matter. Online tools and charts are a good starting point, and a personal assessment gives the full picture.
If you are unsure which stage you are at, send clear photos of the front, top, crown, sides and back through our contact page. You will get a free first analysis with no obligation.
Frequently asked questions
What Norwood stage is a receding hairline?
A slight recession at the temples is usually Norwood 2, often called a mature hairline. When the temples recede deeply into an M, U or V shape, it is usually Norwood 3.
Can you go back a Norwood stage?
Medical treatment can slow loss and sometimes thicken thinning hair, but follicles that have stopped producing hair do not usually return. A transplant can change how the scalp looks, though your underlying pattern of hair loss stays the same.
How fast do you move between Norwood stages?
It varies widely. Some men stay at one stage for decades, while others progress over a few years. Early onset and a strong family history are often linked to faster progression.
At what Norwood stage should I get a hair transplant?
There is no single right stage. Many patients have surgery at Norwood 3 to 5, but age, donor supply and how stable your loss is matter more than the number.
Is Norwood 2 balding?
Not necessarily. Many men develop a mature, Norwood 2 hairline and never go further. Taking photos over time shows whether it is stable or progressing.
Sources
- Southern Medical Journal – Norwood OT, Male pattern baldness: classification and incidence (1975)
- NCBI StatPearls – Androgenetic Alopecia
- MedlinePlus – Male pattern baldness
- NHS – Hair loss
Our articles explain hair transplant topics in plain language. They are general information and do not replace a consultation with a doctor.
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