Quick answer: The Norwood scale (also called the Hamilton-Norwood scale) grades male pattern hair loss, or androgenetic alopecia, in seven stages: from stage 1, no recession, to stage 7, a horseshoe of hair around the back and sides. Stages 1 to 3 are the window for prevention and natural DHT blockers; from stage 4 onward, it's worth adding a doctor's opinion.
Where the Norwood scale comes from
Dr. James Hamilton first classified patterned hair loss in men in 1951 (Hamilton 1951). In 1975, Dr. O'Tar Norwood refined it into the seven-stage version still used today, based on 1,000 adult men, and noted that hair loss continues to progress with age (Norwood 1975). Dermatologists and hair transplant surgeons use it to describe how far hair loss has gone.
The 7 Norwood stages
| Stage | What it looks like | What makes sense |
|---|---|---|
| 1 | Full hairline; no recession | Prevention if hair loss runs in your family |
| 2 | Slight recession at the temples; the M is starting | Best window for natural DHT blockers |
| 3 | Clear recession at the temples into a deep M or V | Natural DHT blockers; track progress with photos |
| 3 vertex | Stage 3 hairline plus thinning at the crown | Treat both areas; the crown responds well |
| 4 | Deeper recession and a visible bald spot at the crown, with a band of hair between | Natural support plus a doctor's opinion |
| 5 | The band between front and crown thins | See a dermatologist first |
| 6 | Front and crown join; the band is gone | Dermatologist or transplant consultation |
| 7 | Horseshoe of hair around the back and sides only | Transplant consultation |
There's also a Class A variant, where the hairline recedes evenly from front to back without a distinct M or crown spot. In one community study, 12% of men had predominantly frontal hair loss of this kind (Rhodes 1998).
Try the interactive Norwood tool in our DHT guide to see each stage and what we'd recommend.
How to find your Norwood stage at home
- Wet your hair and push it back so the hairline is fully visible.
- Photograph the front and both temples straight on, in bright, even light.
- Photograph the crown from above. Ask someone, or use a second mirror.
- Compare with the table above. Between two stages? Pick the higher one.
- Save the photos. They're your baseline for tracking any treatment.
Norwood 2 or a mature hairline?
Most men's hairlines move back slightly in their late teens and twenties. A mature hairline rises evenly by about a finger's width and then holds. Norwood 2 that's turning into Norwood 3 keeps moving, deepens at the temples and shows fine, wispy hairs along the edge. If you're unsure, take photos three months apart. More in how to stop a receding hairline early.
How fast do men move through the stages?
It varies widely with genetics. Some men stay at Norwood 2 for decades; others move from 2 to 4 within a few years. Hair loss is common early: 16% of men aged 18 to 29 already show moderate to extensive loss (Norwood 3 or beyond), rising to 53% in their forties (Rhodes 1998).
Why the early stages matter most
At Norwood 1 to 3, follicles at the temples and crown are shrinking under DHT but still active. That's when slowing DHT has the most to protect. Natural DHT blockers saw palmetto and pumpkin seed oil were tested in men with mild to moderate hair loss, and rosemary oil matched minoxidil 2% on hair count over six months.
DHT Defense Hair Oil brings all three together with bhringraj in a light scalp oil, made for Norwood 1 to 3. Made in Toronto, no prescription, two minutes a day.
Frequently asked questions
What Norwood stage am I?
Wet your hair, push it back and photograph your hairline and crown in bright light, then compare with the seven stages above. Between two stages, choose the higher one.
Is Norwood 2 balding?
Not necessarily. Norwood 2 can be a mature hairline that stops moving. If it keeps receding or deepens at the temples, it's early male pattern hair loss.
Can you go back a Norwood stage?
Some men regain density in the early stages, especially at the crown, while follicles are still active. Long-bald areas rarely return without a transplant. See is androgenetic alopecia reversible?
What's the difference between the Hamilton and Norwood scales?
They're the same system. Hamilton created the original in 1951; Norwood refined it in 1975, so it's often called the Hamilton-Norwood scale.
What Norwood stage is too late for natural treatment?
Natural DHT blockers work best at stages 1 to 3. From stage 4, they can support the hair you keep, but a dermatologist can tell you about stronger options.
Related reading
- Androgenetic alopecia (AGA): causes, stages and natural treatment options
- Is androgenetic alopecia reversible?
- Natural DHT blockers for hair loss
References
- Hamilton JB. Patterned loss of hair in man; types and incidence. Ann N Y Acad Sci. 1951. PMID 14819896
- Norwood OT. Male pattern baldness: classification and incidence. South Med J. 1975;68(11):1359-65. PMID 1188424
- Rhodes T, et al. Prevalence of male pattern hair loss in 18-49 year old men. Dermatol Surg. 1998. PMID 9865198