Norwood Scale: The 7 Stages of Male Hair Loss Explained

The norwood scale is a seven-stage picture chart that describes how male pattern hair loss progresses, from an intact juvenile hairline at stage one to a band of hair around the sides and back at stage seven. It was built to give clinicians and researchers a shared vocabulary, and it is descriptive rather than predictive: it tells you where you are today, not where you will be in five years.

Most people first notice a change in the barber chair, not in the mirror.

What is the norwood scale, and who uses it?

The norwood scale is a visual classification of male pattern hair loss, drawn as a row of head diagrams that get progressively balder. James Hamilton first described a staged system in the 1950s, and O’Tar Norwood revised and extended it in the 1970s, which is why you will also see it written as the Hamilton-Norwood scale. Surgeons, trichologists and researchers use it because it turns a vague conversation about “thinning on top” into a number that two people can agree on.

Its limits matter as much as its use. The scale says nothing about hair density within a stage, nothing about the calibre of the individual strands, and nothing about how fast the pattern is moving. Someone can sit at the same stage for fifteen years. Someone else can pass through two stages in three. It is a snapshot of shape, and it should be read that way.

What are the seven stages, one by one?

Each stage describes a recognisable shape rather than a percentage of hair lost. Reading them in order makes the logic obvious: the front and the crown thin separately, then meet.

There is also a type A variant, which accounts for roughly one in ten men. In type A the hairline moves straight backwards in a level line, without the crown thinning separately first and without leaving the isolated forelock island that the classic pattern produces.

A man with his hand on his forehead considering where his hairline sits today.

How do you work out your own stage accurately?

Three photographs answer it faster than any online quiz. Take one straight on with your hair dry and pushed back off the forehead, one from directly above looking down at the crown, and one in profile. Use the same room, the same light and the same time of day, because wet hair, bathroom downlights and a fresh haircut can each shift the apparent stage by a full step. Repeat the set every three months and compare like with like.

Then ask two questions in order. Is the hairline receding at the temples, and is the crown thinning? Front only puts you in stages 2 to 3. Front and crown, with hair still bridging between them, is stage 4 or 5. No bridge at all is stage 6 or 7. If you are unsure whether what you are seeing is loss or normal shedding, our guide to what the hair pull test actually shows explains the difference.

What causes the pattern the scale tracks?

The pattern is inherited and androgen-driven. Follicles at the temples and crown carry a genetic sensitivity to dihydrotestosterone, a derivative of testosterone, while the follicles at the sides and back largely do not. Sensitive follicles miniaturise over successive cycles: each new hair emerges a little shorter, finer and less pigmented than the last, until it produces vellus hair that no longer covers the scalp. That is why the horseshoe survives at stage 7 and why transplanted hair from the back keeps growing when moved to the front.

The NHS is clear that male and female pattern baldness is permanent and usually runs in the family. It also separates that from temporary causes such as illness, stress, weight loss, iron deficiency and cancer care, which behave very differently. Our deeper look at what starts and speeds up androgenic alopecia and at why receptors are distributed in a pattern covers the mechanism properly.

Is the norwood scale useful for women?

Not really, and using it on a woman usually produces a misleading answer. Female pattern hair loss typically presents as diffuse thinning that widens the central parting while the frontal hairline is preserved, so a woman with significant loss can still score as stage 1 on a scale that only looks at the hairline and crown. The Ludwig scale, with its three grades of central thinning, describes that presentation far better, and the Sinclair scale is used in the same way.

The underlying biology overlaps but the visible result does not, which is why we keep a separate guide to the signs and stages of female pattern hair loss. Women who notice a widening parting alongside irregular periods, acne or new coarse facial hair should raise all of it with a GP together, because those things are assessed as a group.

How does the norwood scale compare with the other classification systems?

Four systems are in regular use and each was built for a different job. Hamilton-Norwood grades male pattern loss by hairline and crown shape across seven stages. Ludwig grades female pattern loss in three grades of central parting widening. Sinclair does the same job as Ludwig on a five-point scale and is often preferred for tracking small changes over time. BASP, a newer basic and specific system, combines a basic hairline type with specific density grades and is designed to describe both sexes.

None of them measures hair calibre, and that is the shared blind spot. Miniaturisation, the gradual thinning of individual strands, happens long before the shape of the hairline shifts, which is why a trichoscope reading and a photograph often disagree about whether anything is happening. If you want a number you can act on, the most useful one is not your stage: it is whether your own three-monthly photograph set, taken in identical conditions, is drifting in one direction.

What is the difference between hair loss, hair shedding and hair breakage?

These three are constantly confused and they need different responses. Hair loss is a follicle problem: the follicle miniaturises or is destroyed, which is exactly what the scale charts. Hair shedding is a cycle problem: a stressor pushes an unusually large share of follicles into the resting phase at once, they release together a few months later, and the count recovers. Hair breakage is a fibre problem: the follicle is healthy but the strand snaps mid-length from heat, bleach, tight styling or friction.

The NHS notes that losing between 50 and 100 hairs a day is normal. Shedding above that after an illness, a crash diet or a stressful few months is usually telogen effluvium and settles on its own. Breakage shows up as short broken ends and a coarse, dull mid-length rather than a receding shape. Only the first of the three moves you along the scale.

The crown is the area the chart tracks most closely from stage 3 vertex onwards.

What do the stages mean for what you can realistically do?

Honesty first: no shampoo, serum or supplement changes an inherited pattern, and Watermans does not claim otherwise. What the stage does change is which cosmetic approach makes sense. Early stages are mostly about looking after the hair you have and not accelerating breakage. Middle stages are where styling, cut and density-building products do the most visible work. Later stages are where a very short cut, a shaved head or a surgical option carried out by a qualified clinician tend to be the realistic choices.

The NHS also makes a point worth repeating: see a GP to get an idea of what is causing your hair loss before approaching a commercial hair clinic. That order protects you from paying for something aimed at the wrong problem.

How should you care for your hair alongside the pattern?

Cosmetic care has one honest job here: keep the hair you still have looking as full and healthy as it can, and stop avoidable breakage adding to the visual problem. Thinning hair is finer hair, and finer hair snaps more easily, so the basics matter more, not less. Wash with something sulfate-free, condition the mid-lengths and ends every wash, towel-blot rather than rub, and keep heat styling low. A scalp that is itchy, flaky or sore is worth sorting out on its own terms.

Washing with something gentle is part of a routine suited to your norwood scale stage.

Grow Me® Hair Growth Shampoo £14.95

A sulfate-free shampoo with biotin, caffeine, rosemary, niacinamide and hydrolysed lupine protein. Cosmetic support for a comfortable scalp and fuller-looking hair, used daily or every other day.

Condition Me® Hair Growth Conditioner £13.95

The natural pairing. Cholesterol, shea butter and glycerin help fine hair detangle with less snapping, which protects the length you have.

Hair Building Fibres £19.95

Electrostatic fibres that cling to existing strands and reduce the contrast between hair and scalp. Genuinely useful at stages 3 to 5, much less convincing on very sparse areas.

Frequently asked questions

What norwood scale stage is considered bald?

There is no single cut-off. Most people would describe stages 6 and 7 as bald, because the front and crown have joined into one area and only the horseshoe remains. Stages 3 to 5 are usually described as thinning or receding.

How fast do people move between stages?

There is no fixed rate, which is the main limitation of the scale. Some men stay at one stage for a decade or more, others progress through two stages in a few years. Family history is the best rough guide available.

Is a receding hairline at 20 always pattern hair loss?

No. A maturing hairline moves back roughly one to two centimetres from the adolescent line in most men during their late teens and twenties, and then stops. Recession that keeps going, or that is joined by crown thinning, is a different matter.

Can you go from stage 4 back to stage 2?

The scale is not designed to run backwards. Miniaturised follicles produce progressively finer hair, and an inherited pattern does not undo itself. Cosmetic products, styling and surgery change how it looks, not the classification.

Does stress move you along the norwood scale?

Stress causes telogen effluvium, a temporary shedding that recovers, rather than pattern loss. It can unmask an existing pattern by thinning everything at once, which is why the two are often confused.

Is the crown or the hairline usually first?

Either. Classic progression starts at the temples, but the vertex variant begins at the crown, and the type A variant recedes straight back with no separate crown patch. All three are normal presentations.

How many hairs a day is normal to lose?

The NHS puts normal daily loss at between 50 and 100 hairs. Scalp hair grows at roughly 0.35 mm a day, about 1 cm a month, according to StatPearls, so a shed hair takes months to be replaced at visible length.

Should I see a GP or go straight to a hair clinic?

See a GP first. The NHS says so directly, because a GP can rule out the temporary causes, such as iron deficiency or thyroid problems, that a commercial clinic has no reason to look for. If your question is about products or a routine rather than a medical one, you can talk to Gail Waterman, our co-founder, as an AI avatar on the Watermans homepage.

What is the bottom line on the norwood scale?

The norwood scale is a useful shared language and a poor crystal ball. It tells you the shape of the loss, not the speed, and it was built for men rather than for the diffuse thinning women usually experience. Use it the way clinicians do: as a way of comparing your own photographs over time and of having a clear conversation with a GP. Then separate the three problems properly, because pattern loss, shedding and breakage each need a different response, and only one of them is what the scale is measuring.

If finer hair is snapping and making the pattern look worse than it is, a sulfate-free hair growth shampoo and a breakage-defence conditioner are the sensible cosmetic baseline.

Sources and references

• NHS: Hair loss
• DermNet: Hair loss, balding, hair shedding, alopecia
• DermNet: Female pattern hair loss
• DermNet: Telogen effluvium
• StatPearls: Physiology, Hair (NCBI Bookshelf)
• StatPearls: Anatomy, Hair Follicle (NCBI Bookshelf)

Watermans products are 100% cosmetic and do not treat medical hair loss. Individual results may vary.