Norwood Scale: A 2026 UK Guide to Hair Loss Stages

The Norwood scale is the standard medical classification of male androgenetic alopecia, dividing male pattern hair loss into seven stages. It was published by Dr O'Tar Norwood in 1975 [1] as a revision of Hamilton's 1951 work [2] and remains the peer-reviewed reference used by hair transplant surgeons in 2026. This guide covers each stage in plain English, what it means for surgery, and the equivalent scales used for women.

Why the Norwood scale matters

Surgeons, dermatologists and hair-loss researchers all use the same vocabulary because of the Norwood scale. When a UK surgeon says "you're a Norwood 3 going to 4", they're describing a specific clinical pattern other surgeons would also recognise. It anchors three things:

1. Diagnosis — confirming you have androgenetic alopecia (genetic male pattern loss) rather than another type of hair loss
2. Progression assessment — comparing photos at 6, 12 or 24 months to see whether loss is stable
3. Surgical planning — graft count estimates depend heavily on stage

If you've had a consultation, your Norwood stage is in your notes.

The seven Norwood stages

The graft counts are rough averages — your case depends on density goal, hair calibre and donor area capacity. The numbers above assume an average UK case at average density goals.

Surgical candidacy by Norwood stage

The ISHRS clinical practice guidance [3] reflects the consensus most credentialed UK surgeons follow:

• Norwood II–IV: standard candidates. Most cases. Single procedure usually sufficient.
• Norwood V: marginal. Viable only with high donor density (>70 follicles/cm²) and realistic density expectations.
• Norwood VI–VII: rarely fully restorable. Donor area is finite — at this level the math doesn't work. Some patients have limited frontal framing combined with scalp micropigmentation (SMP) for the back; some go non-surgical.

Stage V is the most discussed grey area. A Norwood 5 with strong donor density and modest density goals can produce an excellent result. A Norwood 5 with thin donor and high goals will disappoint. The same diagnosis isn't the same case.

See our Am I a candidate? guide for the broader candidacy assessment beyond Norwood stage.

Type A variant

Around 5–10% of men have a "Type A" pattern, where the hairline recedes uniformly from front to back without preserving the mid-frontal forelock. A Type A III can look superficially similar to a standard Norwood IV at first glance, but the hairline-design strategy differs. Surgeons experienced with the variant adjust placement to avoid creating an artificially-strong forelock against an otherwise receding pattern.

Norwood vs Hamilton

The Hamilton classification (1951) [2] was the original eight-stage system. Norwood revised it to seven stages in 1975 [1] with clearer clinical descriptions and the addition of the Type A variant. When surgeons say "Norwood" today they almost always mean the Hamilton-Norwood scale; "Hamilton-only" is rarely used in modern practice.

A few alternative scales exist — the Beek scale [15] accounts for temporal recession and vertex thinning simultaneously and is sometimes used in clinical research. None has replaced Hamilton-Norwood as the peer-reviewed standard.

Female equivalents: Ludwig and Sinclair scales

Female pattern hair loss has a different presentation from male — usually diffuse thinning across the central scalp rather than patterned recession — so it uses different scales:

• Ludwig 3-stage scale (1977) [9]: Stage I (light thinning), Stage II (moderate), Stage III (severe). Standard reference, still widely cited.
• Sinclair 5-point visual scale (2005) [10]: more granular assessment of midline part-width thinning. Often used in modern UK clinical practice because it picks up earlier-stage loss the Ludwig misses.

Female pattern loss is more often non-surgical because the loss pattern is diffuse: the donor area at the back of the scalp may also be miniaturising, making transplanted hair less reliably permanent. See our female hair transplant guide for the full picture.

Documenting Norwood stage over time

A diagnosis is a snapshot. Surgical candidacy depends on whether the loss is stable, which can only be assessed across time.

UK surgeons typically document progression via:

1. Serial global photography — standardised lighting, identical angles, taken every 6 months
2. Trichoscopy — handheld dermatoscope measuring follicle miniaturisation rate (significant if >20%)
3. Medical-therapy trial — many BAHRS surgeons require a 6–12 month trial of finasteride or minoxidil for patients under 30 [4] to stabilise loss before considering surgery

If your loss has progressed by half a Norwood stage in the last 6 months, you're not stable yet. Surgery now risks an island of transplanted hair behind a continuing recession in 5–10 years.

What this means for you

If you don't already know your stage:

• Look at standardised photos of yourself from age 18–22 vs now
• Match against the seven-stage description above
• Take recent photos in consistent lighting; you'll need them for any consultation

If you do:

• Stages II–IV — most surgeons will accept primary cases without much friction
• Stage V — get more than one consultation; the marginal call is real
• Stages VI–VII — be very wary of any surgeon who promises a full restoration. Either the donor math doesn't work or the result will be cosmetically thin

For the broader candidacy picture — donor density, age, exclusions, conditions — see our candidacy guide.

References

1. Norwood OT. Male pattern baldness: classification and incidence. South Med J. 1975;68(11):1359-65. DOI: 10.1097/00007611-197511000-00009.
2. Hamilton JB. Patterned loss of hair in man: types and incidence. Ann N Y Acad Sci. 1951;53(3):708-28. PMID: 14819894.
3. ISHRS. Clinical Practice Guidelines for Hair Restoration. 2026.
4. BAHRS. Patient Selection Criteria for Hair Transplant Surgery in the UK. 2026.
5. Ludwig E. Classification of the types of androgenetic alopecia occurring in the female sex. Br J Dermatol. 1977;97(3):247-54. DOI: 10.1111/j.1365-2133.1977.tb15179.x.
6. Sinclair R, et al. A 5-point visual scale for FPHL. Br J Dermatol. 2005;152(3):466-73. DOI: 10.1111/j.1365-2133.2004.06280.x.
7. Gupta M, et al. Classifications of Patterned Hair Loss: A Review. J Cutan Aesthet Surg. 2016;9(1):3-12.

This guide is informational and not medical advice. Specific staging requires assessment by a qualified clinician.