The Norwood Scale Explained
The Norwood-Hamilton scale is the standard classification system for male pattern baldness. Understanding your stage helps you plan the right approach to hair restoration.
What Is the Norwood Scale?
The Norwood Scale (also called the Hamilton-Norwood Scale) classifies male pattern hair loss into seven stages. Developed by Dr. James Hamilton in the 1950s and later revised by Dr. O'Tar Norwood in the 1970s, it remains the most widely used classification system by hair transplant surgeons worldwide.
Knowing your Norwood stage helps determine how many grafts you'll need, which technique is best, and what kind of results you can realistically expect.
The 7 Stages
Stage 1 — No Significant Loss
Little to no recession of the hairline. This is the baseline — no treatment is typically needed.
Grafts needed: 0Stage 2 — Slight Recession
Minor recession at the temples, sometimes called a "mature hairline." Common in men over 25 and often not considered balding.
Grafts needed: 500–1,000Stage 3 — Noticeable Recession
Deeper recession at both temples creating an M, U, or V shape. This is usually the earliest stage where a hair transplant is commonly considered.
Grafts needed: 1,500–2,500Stage 3 Vertex — Crown Thinning
Hairline recession is minimal but significant thinning or baldness appears at the crown (vertex). The two areas haven't merged.
Grafts needed: 1,500–2,500Stage 4 — Significant Loss
Further hairline recession with more crown thinning. A band of hair still separates the front and crown areas, but both are noticeably thin.
Grafts needed: 2,500–3,500Stage 5 — Merging Zones
The band of hair between the front and crown is narrower and thinner. The bald areas are larger and beginning to merge.
Grafts needed: 3,000–4,500Stage 6 — Joined Bald Areas
The front and crown bald areas have fully merged. Only a horseshoe band of hair remains on the sides and back of the head.
Grafts needed: 4,000–6,000Stage 7 — Extensive Loss
The most advanced stage. Only a narrow band of thin hair remains in a horseshoe pattern. Donor area may be limited.
Grafts needed: 5,000–7,000+What Does This Mean for Your Transplant?
Your Norwood stage directly impacts your treatment plan. Lower stages (2-3) typically need fewer grafts, can be done in a single session, and have the best outcomes because there's existing hair to blend with. Higher stages (5-7) require more grafts, sometimes multiple sessions, and careful management of the limited donor area.
Most surgeons recommend acting earlier rather than later. Transplanting at Stage 3-4 gives you more donor hair to work with and more natural-looking results than waiting until Stage 6-7.
How to Determine Your Stage
While a surgeon's evaluation is the gold standard, you can get a preliminary assessment with AI analysis. Our tool uses your photos to classify your Norwood stage and estimate the grafts needed — giving you a solid foundation before you book a consultation.
Find Out Your Norwood Stage
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