Classification

The Norwood scale, stage by stage.

Seven stages describing how male pattern loss progresses, plus the three Ludwig stages used for women. Every surgeon uses this shorthand — knowing yours makes the first conversation specific rather than vague.

Norwood–Hamilton · male pattern

Seven stages

No visible recession

No surgical need

Slight temple recession

800–1,500 grafts typical

III

Deep temporal recession

1,500–2,400 grafts typical

IIIv

Recession plus early crown thinning

2,000–3,000 grafts typical

Frontal loss with crown thinning

2,500–3,600 grafts typical

Bridge between front and crown narrowing

3,000–4,500 grafts typical

Front and crown merged

4,000–5,500 grafts typical

VII

Horseshoe pattern only

5,000–6,500 grafts typical

Ludwig · female pattern

Three stages

Part line beginning to widen

800–1,600 grafts typical

Noticeably widened part, visible scalp

1,500–2,600 grafts typical

III

Diffuse thinning across the top

2,200–3,400 grafts typical

Read these numbers carefully

The graft ranges above are planning conventions, not quotes. What you can actually have is determined by your donor density — how many follicular units per square centimeter there are at the back and sides — and that cannot be assessed from a photograph, let alone from a diagram.

Two men at the same Norwood stage can be told 2,800 and 4,600 grafts respectively, and both numbers can be right. Treat the scale as a way to describe where you are, not as a price list.

Get a range for your case

Where the scale came from, and what it is for

The classification was described by James Hamilton in 1951 and revised by O’Tar Norwood in 1975, which is why it is properly called the Norwood-Hamilton scale. It was never designed as a treatment plan. It is a shared vocabulary: a way for two clinicians on opposite sides of the world to describe the same head without exchanging photographs.

That is exactly how a patient should use it too. Saying “I am a Norwood IV with a thinning crown” turns a vague conversation into a specific one. Believing that Norwood IV entitles you to a particular graft number does the opposite, because the scale describes what you have lost and says nothing at all about what you have left to give.

The stages people mix up

Three distinctions cause most of the confusion, and getting them right changes what a surgeon will recommend.

A mature hairline is not stage II. Almost every man's hairline settles about a centimeter higher than it sat at sixteen, and that is normal maturation, not the beginning of loss. Counting it as stage II is how twenty-two-year-olds end up operated on too early.
Stage III vertex is not stage IV. The vertex variant is a defined frontal recession plus early crown involvement, with the bridge between them intact. Stage IV has lost more of that bridge, and once the bridge goes the graft requirement rises sharply.
A variants recede front to back in a single line with no separate crown loss. They look milder early on and often require more grafts, because there is no surviving bridge to work with.

Ludwig, and why women need a different scale

Female pattern loss usually preserves the frontal hairline and thins diffusely across the top, with the part line widening over the years. The three Ludwig stages describe that progression. Applying Norwood to a woman generally produces nonsense, because it measures recession that has not happened while ignoring the diffuse thinning that has.

Ludwig stage	What it looks like	Usual first step
I	Part line slightly wider, visible under bright light	Investigate causes, medical therapy
II	Clearly widened part, scalp visible across the top	Full workup; surgery only if a cause is ruled out
III	Diffuse thinning across the whole top, hairline preserved	Donor supply is often the limiting factor

The practical consequence is that for women the surgical conversation starts with blood tests and trichoscopy rather than a graft number, because a treatable cause is far more likely than in a man of the same apparent severity.

Not sure where you stand?

A free assessment gives you a measured graft range and a clear answer on whether surgery is the right move this year.

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Using your stage in a consultation

The useful sentence is not “I am a Norwood IV”. It is “I am roughly a Norwood IV, it has moved about one stage in the last six years, my father was a VI by fifty, and I am not currently taking any medication.” That sentence contains the stage, the rate, the likely destination and the treatment context — everything a surgeon needs before examining you.

Expect a surgeon to design for the destination, not the current stage. If your family history and rate of loss point toward stage VI, a hairline built for stage IV will look increasingly odd as the ground behind it disappears. That is the reasoning behind a higher hairline, a smaller covered area or a recommendation to stabilize medically first — and it is worth asking your surgeon to state which stage they are planning for.

Which stage are you?

Pick the diagram closest to yours and we will come back with a planning range and an honest read on whether surgery is the right move yet.

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