What Is the Norwood Scale?
The Norwood-Hamilton classification groups common patterns of androgenetic hair loss in men. Clinicians and patients use it to describe how recession and thinning are distributed across the frontal hairline, temples, mid-scalp and crown.
It is a visual classification, not a laboratory test. Two people labelled with the same stage can have different donor density, hair calibre, miniaturisation, scalp health, rate of change and priorities. Their treatment plans may be completely different.
A stage can also miss diffuse thinning that does not follow the classic outline. Sudden, patchy, inflamed or scarring loss needs diagnosis rather than a scale label.
Norwood Stages Explained
Stage 1
Little or no obvious recession. A naturally high or mature hairline is not automatically hair loss.
Stage 2
Mild recession, often at the temples. The shape, rate of change and miniaturisation matter more than the number alone.
Stage 3
Deeper frontal or temporal recession. This is commonly treated as a clearer expression of pattern loss, but diagnosis still comes from history and examination.
Stage 4
More extensive frontal loss, often with crown thinning, while a band of hair remains across the top between the areas.
Stage 5
The frontal and crown areas are larger and the band between them is narrower or less dense.
Stage 6
The separating band is largely lost, creating a broader continuous area across the top.
Stage 7
The most extensive classic pattern, with a narrower horseshoe of hair remaining at the back and sides. Donor limitations are often central to any surgical discussion.
What Does Norwood 3 Vertex Mean?
A vertex pattern gives particular prominence to thinning at the crown while frontal recession may be closer to stage 3. The crown’s spiral shape can make a relatively small change look prominent under overhead light.
Crown transplantation can use many grafts because of the surface area and whorl. In a progressing pattern, the surgeon may prioritise the frontal area or preserve donor hair for later. Read the crown hair transplant guide.
What the Norwood Scale Cannot Tell You
- The medical cause of hair loss
- How quickly the pattern will change
- Whether the donor region is stable
- How many grafts can be removed responsibly
- Whether FUE, FUT or DHI is suitable
- How much visual density a given graft number will create
- Whether medication is appropriate
- What a future hairline should look like
Online tools that turn a stage into an exact graft number ignore the dimensions of the scalp and the quality of the donor supply. They can provide discussion prompts, not a surgical plan.
Does the Norwood Scale Apply to Women?
Women can develop frontotemporal recession, but many have widening of the parting or diffuse thinning that is poorly described by the classic Norwood pattern. Other classification systems, including Ludwig or Sinclair scales, may be used alongside examination.
Diffuse loss can extend into the proposed donor area. Hormonal change, traction, iron deficiency, thyroid disease, illness and inflammatory or scarring conditions may also need consideration. Read the clinic’s page about hair transplants for women.
Does a Norwood Stage Decide the Graft Number?
No. Graft planning uses the measured recipient area, existing density, donor capacity, hair calibre, curl, colour contrast, design and future reserve. A compact stage 3 and a broad stage 3 are not the same size.
At advanced stages, trying to recreate the density of an adolescent scalp across every thin area can exceed the donor supply. A conservative hairline, selective coverage or no surgery may be the more credible recommendation.
The donor area guide explains why the remaining hair at the back and sides sets the limit.
Treatment Is Based on Diagnosis, Not Stage Alone
Depending on the cause and patient, options can include monitoring, camouflage, prescribed medication, PRP discussion or hair transplantation. These choices have different evidence, risks and goals.
FUE, FUT and DHI cannot stop untreated native hair from continuing to thin. A transplant design needs to remain believable if the pattern progresses. Younger patients and those with active change may be advised to wait or use a more conservative plan.
Hair-Loss Assessment in Liverpool
Dr Harpreet Kalra, GMC 7126076, assesses the pattern, scalp and donor area before discussing a graft range or method.
Liverpool clinic
2–12 Lord Street, Liverpool L2 1TS
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