The Norwood Scale sets out the recognisable pattern of male hair loss, from slight temple recession to extensive loss across the front, mid-scalp and crown. Clinicians use it as a common language for visible change. It does not diagnose why somebody is losing hair or decide whether treatment is suitable.
A stage number is only one part of an assessment. Two men at the same stage can differ in age, hair calibre, donor density, rate of change, medical history and the amount of native hair still present.
What the Norwood Scale describes
The Hamilton–Norwood Scale classifies the common pattern of androgenetic alopecia in men. Two areas often change together: the hairline moves back at the temples and the crown gradually becomes thinner. As loss advances, the frontal and crown areas can widen and eventually meet.
Clinicians use the scale to record what they see and discuss it in consistent terms. A receding hairline, mid-scalp thinning and crown loss cannot be planned in isolation because all three areas draw on the same finite donor supply.
Norwood stages are not a timetable. Some men remain at an earlier stage for years; others notice steadier change across the front and crown. Older photographs, family history, scalp examination and donor measurements put the stage number into context.
Norwood Stage 1
No established recession
The frontal hairline remains intact, with no obvious recession at the temples. Stage 1 does not mean that hair loss will develop. It is the starting point used by the classification.
If somebody reports increased shedding or a change in density despite an unchanged hairline, the Norwood Scale may not describe the problem. Sudden shedding and diffuse thinning need to be considered separately rather than being forced into a stage.
At Stage 1 there is usually no surgical issue to correct. Photographs taken in consistent lighting and from the same angle can provide a useful baseline if the hairline or density appears different later.
Norwood Stage 2
Early temple recession
The hairline has moved back slightly at the temples, often in a broadly symmetrical pattern. This is sometimes called a mature hairline. The term does not, on its own, show whether recession has stopped.
A single photograph cannot show whether recession is stable. Comparisons work best when the hair length, camera angle and lighting are kept consistent. A clinician will also ask when the change began and whether it has continued.
Planning a low, dense transplant this early can cause difficulties if the native hair behind it later becomes thinner. Any discussion about hair-loss medication or surgery must allow for the likely long-term pattern, not only the present hairline.
Norwood Stage 3
Established frontal recession
The recession is deeper and the central forelock becomes more prominent, creating an M, U or V-shaped hairline. This is generally the first stage regarded as clearly established male pattern hair loss.
The visible effect varies. Hair calibre, colour contrast and the density of the forelock all affect how much scalp can be seen, even when two patients have a similar outline of recession.
Stage 3 can lead to a discussion about transplantation, but it is not an automatic indication for surgery. The assessment still has to take account of age, rate of change, donor quality and medical history. The hairline design must also remain natural if native hair continues to thin. Our hairline transplant guide explains how the frontal shape is assessed.
Norwood Stage 3 Vertex
Crown thinning as well as frontal recession
Stage 3 Vertex includes a defined area of thinning at the crown alongside the frontal change. The crown follows a natural spiral, and its apparent size can alter considerably with lighting, hair length and styling.
Crown loss can spread across a large circular area. Restoring it too aggressively may use grafts that are needed elsewhere later, which is why the front and crown cannot be planned as two separate procedures.
The decision depends on the whole scalp and the likely future pattern, not the crown in isolation. The clinic's crown hair transplant guide looks at this area in more detail.
Norwood Stage 4
Separate frontal and crown areas
Recession at the front is more pronounced and the crown has a larger area of loss. A band of native hair still separates the two areas across the mid-scalp.
That band may remain strong or become thinner as the pattern progresses. Its density has to be examined rather than judged from the way the hair looks when it is combed.
At this stage, priorities have to be agreed. Rebuilding the frontal frame often has more visual impact than spreading the same number of grafts thinly across the hairline, mid-scalp and crown. The patient's aims must fit the limits of the donor area.
Norwood Stage 5
A narrower bridge of hair
The frontal and crown areas are larger, and the band between them has become narrower or less dense. The two areas have not fully joined, but the surface requiring coverage is now substantial.
Trying to recreate the density of a full head of hair across the entire top of the scalp is rarely a sensible use of the donor supply. A surgeon has to decide where density will make the greatest visible difference and where lighter coverage may be acceptable.
Donor measurements matter more than a promised graft number. The coverage that can be achieved depends on density, hair calibre, colour contrast and safe extraction limits. These factors also explain why hair transplant cost cannot be calculated accurately from a Norwood stage alone.
Norwood Stage 6
The front and crown have joined
The strip of hair across the mid-scalp has largely disappeared, leaving one continuous area of loss over the front, top and crown. Hair remains around the back and sides.
The size of the recipient area makes the balance between coverage and density unavoidable. Concentrating grafts in the frontal third can frame the face, whereas the mid-scalp and crown may need a lighter approach.
Surgery may still be possible when the donor area is strong, but full native-looking density across the entire bald area is rarely a sensible promise. A conservative hairline and clearly agreed priorities usually make better use of the available grafts.
Norwood Stage 7
The most advanced pattern
A narrower horseshoe-shaped band remains at the back and sides, and the donor fringe may sit lower than it does at Stage 6. The difference between the size of the recipient area and the available donor supply is at its greatest.
The donor area must be examined for density and miniaturisation. Taking too much hair from a limited fringe can leave the back and sides visibly depleted without providing enough coverage on top.
Some patients will not be suitable for surgery. When treatment is feasible, the aim is usually strategic coverage rather than equal density everywhere. That judgment depends on an individual donor assessment.
How the scale is used in treatment planning
The scale helps a clinician record the present pattern and discuss what may happen if androgenetic alopecia progresses. It also shows the main limitation of transplantation: the donor area is finite, but the area that might need coverage can become larger.
A surgical plan therefore considers more than the visible bald area. Donor density, miniaturisation, hair calibre, scalp characteristics, family history, age, medical history, previous surgery and the patient's priorities all affect what can be planned. The relevant procedures include FUE hair transplantation, DHI hair transplantation and FUT hair transplantation.
Medication and existing hair
Finasteride and minoxidil are widely used treatments for male pattern hair loss. They work differently, and neither is suitable for everyone. Finasteride reduces the conversion of testosterone to dihydrotestosterone (DHT). Minoxidil is a hair-growth stimulant, not a DHT blocker. Benefits generally depend on continued use.
Any treatment should be discussed with an appropriately qualified clinician, including possible side effects and contraindications. A hair transplant does not stop untreated native hair from becoming thinner, so the likely future pattern remains relevant after surgery. Further information is available in the hair-loss medication guide and hair transplant aftercare guide.
What the Norwood Scale cannot tell you
The scale cannot confirm that male pattern hair loss is the cause. Sudden shedding, patchy loss, scarring, scalp inflammation or an unusual pattern needs a broader clinical assessment. Norwood staging also does not measure donor strength, predict an exact graft requirement or guarantee suitability for surgery.
The classification was developed around the typical male pattern. Female pattern hair loss is usually classified differently, and diffuse thinning may not fit neatly into a Norwood stage.
You can compare your hairline and crown with the stage descriptions, but photographs are easy to misread. Wet hair, styling, camera angle and lighting all change the apparent density. Dr Harpreet Kalra assesses the scalp and donor area before discussing treatment; a diagram or stage number is not enough.
About Dr Harpreet Kalra
Dr Harpreet Kalra is the surgeon at Glasgow Hair Transplant Clinics. He assesses the pattern of loss, donor-area quality and likely long-term progression before medical treatment or hair transplant surgery is discussed.