The Norwood Scale is the clinical gold standard for measuring male pattern baldness. Here's what every stage means — and what UK men can actually do about it.
Key takeaway: Knowing your Norwood stage is the single most important step in managing hair loss effectively. Stages 1–3 respond well to Minoxidil. Stages 4–5 often combine medical and surgical options. Stages 6–7 are primarily surgical. The earlier you know, the more options you have.
The Norwood Scale — formally the Hamilton-Norwood Scale — is the most widely used clinical system for measuring male pattern baldness (androgenetic alopecia). Developed by Dr James Hamilton in the 1950s and significantly refined by Dr O'Tar Norwood in 1975, it remains the standard tool used by dermatologists, trichologists and hair transplant surgeons across the UK — and is now increasingly used alongside AI-powered tools like Hair Score platforms to track progression monthly.
The scale classifies hair loss into seven distinct stages, tracking two primary zones: the frontal hairline and temples, and the vertex (crown). It also includes a "Type A" variant that describes a different recession pattern — a straight-back retreat of the frontal hairline without a distinct crown spot.
Around 8 million men in the UK experience some degree of androgenetic alopecia. By age 50, roughly 50% of British men will have noticeable hair loss. By 70, that figure rises to approximately 80%. In 2026, a growing number of those men are tracking their Norwood progression monthly using AI-assisted tools — moving from guesswork to data.
Each stage describes the extent and pattern of hair loss. Your stage is best assessed from consistent, well-lit photos taken in the same conditions — which is precisely what HairJourney's Hair Score helps you do monthly.
The Type A variant: Around 20% of men experience Type A progression — a straight-back retreat of the entire frontal hairline without an isolated crown spot. All stages have a Type A variant, and treatment approaches are similar. The key difference is that Type A men rarely develop the isolated crown bald patch of the standard scale.
Male pattern baldness is driven primarily by dihydrotestosterone (DHT), a potent hormone derived from testosterone via the enzyme 5-alpha reductase. DHT causes hair follicles genetically predisposed to sensitivity to progressively miniaturise — producing thinner, shorter hairs over successive growth cycles until they stop producing visible hair entirely.
The three key factors determining your progression rate:
| Stage | First-line treatment | Additional options | UK availability |
|---|---|---|---|
| 1–2 | Minoxidil 5% | Scalp health, DHT-blocking shampoo | Over the counter (Boots, Lloyds) |
| 3–3V | Minoxidil + Finasteride | Low-level laser therapy (LLLT) | Finasteride requires private prescription in UK |
| 4–5 | Finasteride + Minoxidil + surgical consultation | PRP therapy, Dutasteride | FUE transplants from £3,500–£7,000 UK |
| 6–7 | FUE hair transplant | Scalp micropigmentation (SMP) | CQC-registered clinics UK-wide |
Most men struggle to accurately self-assess because they see their hair daily and can't detect gradual change. The most reliable method is consistent monthly photography — front, crown and side view, in the same lighting conditions — compared against the scale's descriptions.
Three things to look for:
Upload a photo, answer 8 clinical questions, and receive a personalised Hair Score from 0–100 — with a breakdown of hairline, crown density and progression risk. Free, takes 60 seconds.
Get My Free Hair Score →Your Norwood stage is one of the most important factors in determining whether you're a suitable hair transplant candidate and how many grafts you'll need. UK clinics use the scale to estimate donor area requirements and predict the final aesthetic result.
As a rough guide for UK FUE procedures in 2026:
The critical constraint at stages 6–7 is donor supply. The back and sides of the scalp contain a finite number of DHT-resistant follicles. An experienced UK surgeon will plan conservatively to ensure long-term results hold as any remaining native hair continues to thin.
You cannot reverse the genetic predisposition, but you can significantly slow progression. Finasteride reduces DHT by 60–70% and in clinical trials stabilised or improved hair loss in over 85% of men after two years. Minoxidil prolongs the growth phase and increases follicle size. Starting treatment at Stage 2–3 gives the best long-term outcome.
Technically yes — Norwood 2 indicates the beginning of androgenetic alopecia. However, many men with Norwood 2 maintain that stage for years or even decades, particularly with treatment. It doesn't automatically mean significant visible baldness is imminent.
Studies suggest that Stages 2 and 3 are most common in the 25–45 age group — the stage at which most men first notice and seek advice about their hair loss. Advanced stages (6 and 7) are most common in men over 60.
Yes. The Hamilton-Norwood Scale is valid across all hair types and ethnicities, including Afro-Caribbean, South Asian and East Asian hair. The pattern of DHT-driven follicle miniaturisation is consistent regardless of hair type, though natural hair texture may make early recession harder to spot.