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The Norwood scale (also known as the Hamilton–Norwood classification) is the most widely used system in the world for describing the stages of male-pattern hair loss. It defines in 7 main stages how hair loss progresses at the hairline and the crown. In hair transplant planning, it gives doctors and patients a common language.
The scale is a starting point, not an exact prescription. Two people at the same stage can differ in hair thickness, donor density and expectations. Still, knowing your stage makes it easier to understand what is possible during the preliminary assessment.
Norwood 1
There is no significant recession of the hairline. The natural, slight rise of the hairline after adolescence is assessed at this stage. No hair transplant is needed.
Norwood 2
A mild, symmetrical recession begins at the temples, giving the hairline a slight M shape. In many men this is considered a "mature hairline". A transplant is usually not needed, though preventive treatment can be discussed for young patients whose hair loss is progressing quickly.
Norwood 3
Considered the first stage of clinically significant hair loss. Recession at the temples deepens and a clear M shape forms. In the Norwood 3 vertex variant, thinning also begins at the crown in addition to recession at the hairline.
At this stage, a hair transplant can give good results by reshaping the frontal hairline and temples. The DHI technique is often chosen for the fine work this area requires.
Norwood 4
Recession at the hairline progresses and the bald area at the crown becomes clearer. A distinct band of hair still separates the two areas. A transplant is a very suitable option at this stage; the front and mid-scalp are usually prioritised, and the crown is treated depending on need and donor capacity.
Norwood 5
The band of hair between the front and the crown becomes thinner and sparser, and the bald area widens. Donor capacity needs careful assessment at this stage. Planning gives priority to the front area that frames the face; a second session may be needed for the crown.
Norwood 6
The bridge between the front and the crown disappears completely, leaving a single large bald area. The hair at the sides may also start thinning from above. A high graft count is needed at this stage, and large-area work with Sapphire FUE can be combined with DHI at the hairline.
Norwood 7
The most advanced stage. Only a horseshoe-shaped band of hair remains around the ears and at the back of the head, and this band may itself have narrowed. Densely covering the whole area is usually not possible at this stage. A realistic goal is a balanced distribution that prioritises the front and mid-scalp, which frame the face. More than one session may be planned depending on donor capacity.
The A variants
In some men, hair loss progresses differently from the classic pattern: the hairline recedes evenly from front to back and no separate bald spot forms at the crown. This pattern is called the "A" variant (for example Norwood 3A, 4A, 5A). In A variants, transplanting the front area makes a very visible difference.
Stage and graft needs
As the stage increases, the number of grafts needed generally increases. But graft count does not depend on stage alone; the real size of the area, the target density, hair thickness and donor capacity are assessed together. We explain approximate ranges and how the estimate is calculated in our how many grafts do I need guide.
How to determine your stage
You can compare photos of your hair taken from the front, above, the crown and the sides in good light with the descriptions above. Photos taken with wet or slicked-back hair show the bald areas more clearly. If you send your photos to us on WhatsApp, we can assess your stage and the right plan for you together.
Frequently asked questions
At which Norwood stage can a transplant be done?
Norwood 3 and above are usually suitable for a transplant. The decision is made together with age, speed of hair loss and donor capacity.
Is a transplant possible at Norwood 7?
It is, but the goal is not to cover the whole area densely; it is a balanced distribution that prioritises the front. More than one session may be needed.
How quickly will my hair loss progress?
It varies from person to person. Your family history and the change over recent years give an indication of the likely course.
Is the Norwood scale used for women?
No. The Ludwig scale is used for female-pattern hair loss.
The information on this page is for general guidance only; diagnosis and treatment decisions are made by a physician after examination. Results vary from person to person.