What Is the Norwood Scale?
The Norwood-Hamilton scale is the most widely used classification of male pattern hair loss. It sorts hair loss into seven stages based on the pattern and extent of recession and thinning.
The stage describes a pattern; it is not a treatment plan. What a stage means for you — whether a transplant is an option, how many grafts it would take and what result is realistic — can only be assessed by a doctor who examines you. For what affects graft numbers, see how many grafts you need.
Stage 1: No Significant Hair Loss
Little or no recession of the hairline. This is the reference point for the other stages. If you notice early thinning, ask a doctor about the options and their side effects.
Stage 2: Slight Recession
Slight recession at the temples, often called a mature hairline. It is common in adult men and does not necessarily mean the hair loss will progress. Ask a doctor whether any treatment makes sense at this stage.
Stage 3: Clearly Visible Recession
Clear recession at the temples, forming an M, U or V shape. Stage 3 Vertex is a variant in which thinning also appears at the crown.
Stages 4-5: Moderate to Extensive Loss
Marked recession together with thinning or baldness at the crown. The band of hair between the front and the crown starts to thin.
Stages 6-7: Advanced Hair Loss
Extensive loss with only a horseshoe-shaped band of hair left at the sides and back. At these stages the donor area limits what is possible.
Why the Stage Is Only a Starting Point
The stage is one of several factors a doctor looks at, alongside your donor area, hair characteristics, age and how your hair loss is developing. Ask your doctor to explain how they assess your case and what they cannot promise.