The Norwood scale: stages of male pattern hair loss

When men talk about their hair loss with a doctor or a hair transplant clinic, they often hear phrases like "Norwood 3" or "Norwood 5". This is the Norwood scale, a simple way of describing the pattern and extent of male pattern baldness.

Where the scale comes from

In 1975, Dr O'Tar Norwood published a classification of male pattern baldness in the Southern Medical Journal. He wrote that the growing popularity of hair transplant surgery had increased the need for an accurate, reproducible and widely accepted standard. He used it to record how common male pattern baldness was at different ages in 1,000 adult men ¹.

The study also pointed out the continued effect of time, even in later years ¹. In simple terms, pattern hair loss tends to progress with age. DermNet notes that the severity of male pattern hair loss can be classified in several ways, including the Norwood system ².

The pattern it describes

Male pattern baldness usually starts above both temples. Over time, the hairline recedes to form an M shape, and hair thins at the crown, sometimes progressing to partial or complete baldness on top ³. The Norwood scale arranges this process into stages, from no loss to the most advanced pattern.

The stages, in plain language

The scale is usually shown as a set of seven drawings. In general terms:

• Stage 1: no significant recession. The hairline sits at its adult position
• Stage 2: slight recession at the temples, often called a "mature hairline". This is common and not always a sign of balding
• Stage 3: clearer recession at both temples, forming a visible M or V shape. This is usually the first stage considered as balding. A variant called 3 vertex has early thinning at the crown as well
• Stage 4: deeper temple recession and a distinct thin or bald patch at the crown, still separated by a band of hair across the top
• Stage 5: the front and crown areas get larger, and the band of hair between them becomes thinner
• Stage 6: the band across the top is lost, so the front and crown join into one large bald area
• Stage 7: the most advanced pattern. Only a horseshoe-shaped band of hair remains around the sides and back

Some versions of the scale also include an "A" variant, where the hairline moves back evenly from the front without a clear M shape or crown patch.

How to place yourself

• Take photos in good light from the front, from above and of the crown. Use a second mirror or ask someone to help
• Compare your hairline with an old photo from your late teens
• Look at the crown as well as the front, because some men thin mainly at the back
• Check for miniaturisation: hairs that are shorter and finer than the rest

It is normal for different people, or even different doctors, to place the same person in slightly different stages. The scale is a guide, not a precise measurement.

What the stages can tell you

• Pattern: whether the loss fits male pattern baldness, rather than patchy or diffuse shedding from another cause
• Progress over time: comparing stages from year to year shows whether loss is advancing or stable
• Planning: hair transplant clinics use the stage to estimate how much area needs covering and whether there is enough donor hair at the back and sides. See hair transplants

What the stages cannot tell you

• How fast you will progress. Some men stay at stage 2 or 3 for decades, while others progress quickly
• Whether treatment will work. Response varies from person to person
• The cause. Not all receding hairlines are male pattern baldness. Frontal fibrosing alopecia, traction alopecia and other conditions can look similar at first. See a receding hairline

Treatment by stage, in broad terms

• Early stages (2 to 4): this is when medical treatment usually has the most hair to protect. Topical minoxidil tends to work best in people under 40 whose hair loss is recent ⁴, and finasteride slows hair loss for as long as it is taken ⁵. See DHT and hair loss
• Middle stages (4 to 5): medicines may still help to keep what remains. Some men consider a transplant if their donor area is good. See hair transplant costs
• Advanced stages (6 to 7): the options are mostly cosmetic, such as hair transplants for selected areas, scalp micropigmentation, hairpieces or a confident shaved look. See scalp micropigmentation

DermNet lists hair transplantation, cosmetics, scalp micropigmentation, hairpieces, minoxidil and 5-alpha reductase inhibitors among the treatment options ².

What about women?

The Norwood scale is designed for men. Women with pattern hair loss usually thin on top while keeping their front hairline, so different scales are used. One of the best known is the Ludwig classification, published in 1977 ⁶. See a widening part.

The bottom line

The Norwood scale is a helpful shared language for describing male pattern baldness, from slight temple recession to the horseshoe pattern. It is useful for tracking change and for planning treatment, but it cannot predict your future or confirm the cause on its own. If you think you are at stage 3 or beyond, or your hair is changing quickly, see a doctor for a proper assessment. See crown thinning and hair loss in your 20s.

Frequently asked questions

What is the Norwood scale?

A classification of male pattern baldness published in 1975 to give a reproducible standard, especially for hair transplant planning ¹.

What Norwood stage counts as balding?

Stage 3, with clear recession at both temples, is usually considered the first stage of balding. Stage 2 is often a normal mature hairline.

Can I move back to a lower stage?

Medicines can slow progression, but results vary and only last while treatment continues ^{5 4}.

Is there a scale for women?

Yes. Women are usually assessed with other scales, such as the Ludwig classification ⁶.

Educational content. Not medical advice.