Almost every conversation about male hair loss — with a dermatologist, a transplant surgeon, or an online forum — uses the Norwood scale as shorthand. It's the map everyone reads from. Knowing where you sit on it does two useful things: it tells you how far your androgenetic alopecia has progressed, and it tells you how much of that is still treatable with medication rather than surgery.
This guide walks through each Norwood stage, the separate Ludwig scale used for women, and — most importantly — what actually works at each point.
Quick Answer
The Norwood scale grades male pattern baldness in seven stages, from a mature hairline (I–II) to extensive loss (VI–VII). Women use the three-grade Ludwig scale instead. Stage matters because treatment works best early — finasteride and minoxidil hold or partly reverse the earlier stages, but lost follicles at VI–VII only come back with a transplant.
Norwood Self-Assessment
Step 1 of 2Two quick questions estimate your male-pattern (Norwood) stage and what works at it. An estimate for guidance, not a diagnosis.
1. How is your hairline at the temples?
The Norwood Scale, Stage by Stage
The Norwood scale (also called the Hamilton-Norwood scale, after the two researchers who developed and refined it) classifies male androgenetic alopecia into seven main stages:
- Stage I — No meaningful recession. A normal, adolescent hairline.
- Stage II — A slight, symmetrical recession at the temples. This is the "mature hairline" most men develop in their twenties, and on its own it is not considered balding.
- Stage III — The first stage that qualifies as balding. Deeper temporal recession creates an M, U, or V shape. Stage III vertex is a common variant where thinning also begins at the crown.
- Stage IV — More pronounced hairline recession plus a distinct thinning or bald patch at the crown, separated by a band of hair across the top.
- Stage V — The band of hair between the front and crown narrows; the two balding zones grow larger and closer together.
- Stage VI — The bridge of hair across the top is largely gone, merging the frontal and crown loss into one large bald area.
- Stage VII — The most advanced stage: only a horseshoe band of hair remains around the sides and back of the scalp.
The pattern reflects biology, not chance. The follicles at the temples and crown are the most sensitive to dihydrotestosterone (DHT), the androgen that drives pattern hair loss, while the hair around the sides and back is genetically DHT-resistant — which is exactly why that band survives, and why it's the donor source in transplants.
The Ludwig Scale for Women
Most women with androgenetic alopecia don't recede at the temples the way men do. Instead they thin diffusely over the top of the scalp while keeping the frontal hairline, so a different scale is used — the Ludwig scale, with three grades:
- Grade I — Mild thinning; the center part starts to widen but is easily covered.
- Grade II — Clearly decreased volume over the crown; the widening part becomes obvious.
- Grade III — Extensive thinning, with the scalp showing plainly through the remaining hair over the top.
A telltale early sign is the "Christmas tree" pattern — a part that fans out wider toward the front. Because women's hair loss can also be driven by iron deficiency, thyroid disease, or hormonal shifts, staging on the Ludwig scale should go hand in hand with the right blood tests before assuming it's purely genetic.
What Works at Each Stage
The single most important thing the scale tells you is urgency. Androgenetic alopecia is progressive, and medication is far better at keeping hair than regrowing it. So the earlier your stage, the more you can protect.
- Norwood I–II / Ludwig I: The goal is prevention. This is the ideal time to start minoxidil and, for men, finasteride — not because you're visibly balding, but because you can lock in the follicles you still have before they miniaturize.
- Norwood III–IV / Ludwig II: The treatable sweet spot. Miniaturizing follicles are still alive and responsive. Combined finasteride and minoxidil is the best-evidenced regimen, and many men hold or partly recover density here. Adding a DHT-blocking shampoo or a laser cap can complement, not replace, the core treatments.
- Norwood V / Ludwig III: Medication can still preserve the remaining hair and is worth continuing, but expectations should shift toward maintenance. Hair transplantation becomes a realistic option for restoring the front.
- Norwood VI–VII: The follicles in the bald zones are largely gone and won't respond to medication. Transplantation (using the DHT-resistant donor band) is the only way to restore hair here, though finasteride/minoxidil — and often a laser cap to support the result — are continued to protect the transplanted and native hair that remains.
Not sure which treatments fit your stage and situation? Our product directory lays out every option we cover — minoxidil, DHT shampoos, supplements, and laser caps — with ratings and pricing side by side.
Starting Early: The Products That Matter Most
If you're in the early-to-mid stages where medication does the most good, the two over-the-counter foundations are minoxidil and, for men who want the strongest hold, a prescription DHT blocker. Minoxidil is the one you can start today:
For finasteride, which requires a prescription, a physician-reviewed online option is often the simplest route — Strut Health compounds a topical finasteride-and-minoxidil formula, reviewed by a US-licensed prescriber and LegitScript-certified.
Frequently Asked Questions
What is the Norwood scale?
The Norwood scale (sometimes called the Hamilton-Norwood scale) is the standard classification for male pattern baldness. It defines seven stages, from Stage I (no meaningful recession) through Stage VII (only a band of hair around the sides and back). Dermatologists and hair transplant surgeons use it to describe the pattern and severity of androgenetic alopecia consistently.
What Norwood stage should I start treatment at?
As early as possible — ideally at Norwood II–III, when miniaturizing follicles are still alive and responsive. Finasteride and minoxidil are far better at keeping the hair you have than regrowing hair that is already gone, so starting at an early stage protects more follicles. Waiting until Norwood V–VI means much of the loss is no longer reversible with medication.
What is the Ludwig scale for women?
The Ludwig scale stages female pattern hair loss in three grades based on diffuse thinning over the crown while the frontal hairline is preserved: Grade I (mild widening of the part), Grade II (noticeably decreased density), and Grade III (extensive thinning where the scalp shows clearly). Women rarely follow the male Norwood pattern of hairline recession, which is why a separate scale is used.
Can you reverse Norwood stages?
Partly, and only at earlier stages. Minoxidil and finasteride can thicken miniaturized hairs and sometimes move you back a fraction of a stage, but their main value is stopping progression. Follicles that have fully died (typical of Norwood VI–VII) do not regrow on medication — restoring hair there requires a transplant. This is why the honest goal of early treatment is holding your ground, not turning the clock back.
Sources
- Norwood OT. Male pattern baldness: classification and incidence. Southern Medical Journal. 1975.
- Ludwig E. Classification of the types of androgenetic alopecia (common baldness) occurring in the female sex. British Journal of Dermatology. 1977.
- Kaufman KD, Olsen EA, Whiting D, et al. Finasteride in the treatment of men with androgenetic alopecia. Journal of the American Academy of Dermatology. 1998. PMID: 9777765.