Hair Loss Progression Calculator
Norwood scale staging and genetics-adjusted progression projections.
About this calculator
This calculator projects your Norwood stage forward by adding an annual progression rate to your Current Norwood stage over the years you choose to project, capping the result at stage 7 (the scale's most severe stage) no matter how far out you project. The progression rate itself comes from Age hair loss began, not Current age: onset before 20 sets the fastest base rate (0.25 stages/year), while onset at 40 or later sets the slowest (0.08), so two men with identical current stages get very different projections purely from how early their hair loss started. Family history multiplies that base rate -- a bald maternal grandfather (the AR gene is X-linked, inherited maternally) adds more than a bald father alone, and having both compounds to a 1.5x multiplier.
Current age itself never appears in the projection formula at all; it only affects the separately-reported Observed rate (how fast you've progressed so far). Turning on finasteride/dutasteride treatment cuts the projected rate by 65% and swaps which projection feeds Projected Norwood stage. This is a population-average model, not a prediction for any individual -- real progression can plateau, accelerate, or respond to treatment very differently from these averages.
Medical Disclaimer
This calculator is for informational and educational purposes only. It is not a substitute for professional medical advice, diagnosis, or treatment. Always consult a qualified healthcare provider before making decisions about your health. Never disregard professional medical advice or delay seeking it because of results from this tool.
Inputs
Results
Projected Norwood stage
5
How to Use This Calculator
- Enter your current age and the age hair loss began, then rate your current Norwood stage (1 = full hair, 7 = extensive loss).
- Set family history flags: indicate if your father and maternal grandfather were bald.
- Enter years to project and whether you are currently on finasteride or dutasteride treatment.
- Read Projected Norwood stage with and without treatment to compare outcomes.
- Use Grafts needed for restoration and Donor area adequate to plan a potential hair transplant consultation.
How the result changes with Current Norwood stage (1-7)
| Current Norwood stage (1-7) | Projected Norwood stage |
|---|---|
| 1.5 | 3.5 |
| 2.25 | 4.3 |
| 4.5 | 6.5 |
| 7 | 7 |
What each input means
- Current age
- Your current age.
- Age hair loss began
- Age when you first noticed hair thinning or recession.
- Current Norwood stage (1-7)
- 1=full hair, 2=slight recession, 3=clinical baldness, 4-5=progressing, 6-7=extensive.
- Father bald/balding (0=No, 1=Yes)
- 1 if your father experienced significant hair loss.
- Maternal grandfather bald (0=No, 1=Yes)
- 1 if your mother's father was bald. The AR gene on the X chromosome is a strong predictor.
- Years to project
- How many years into the future to estimate.
- On finasteride/dutasteride (0=No, 1=Yes)
- 1 if currently taking a DHT blocker (finasteride or dutasteride).
- Estimated available donor grafts
- Most men have roughly 6,000-8,000 harvestable donor grafts; a surgeon's density count gives a better figure.
What each result means
- Projected Norwood stage
- Estimated Norwood stage after the projection period, accounting for treatment.
- Without treatment stage
- Projected stage without any treatment.
- With treatment stage
- Projected stage with finasteride/dutasteride treatment.
- Progression rate (stages/yr)
- Estimated annual rate of hair loss progression.
- Years to next stage
- Estimated years until progression to the next Norwood stage without treatment.
- Scalp affected (%)
- Approximate percentage of scalp currently affected by hair loss.
- Grafts needed for restoration
- Approximate number of hair grafts needed for full restoration at projected stage.
- Donor area adequate? (1=Yes)
- 1 if the grafts needed at your projected stage fit within the donor supply you entered.
- Aggressiveness (0-3)
- 0=slow, 1=moderate, 2=aggressive, 3=very aggressive hair loss pattern.
- Genetic risk multiplier
- Multiplier based on family history (1.0=average, higher=more risk).
How this is calculated
Worked example, using the default values
- Identify Input Parameters4 parametersCurrent age = 35, Age hair loss began = 22, Current Norwood stage (1-7) = 3, Father bald/balding (0=No, 1=Yes) = 0 = 7 input(s) provided
- Calculate Projected Norwood stageProjected Norwood stage5 = 5
- Calculate Without treatment stageWithout treatment stage5 = 5
- Calculate With treatment stageWith treatment stage3.4 = 3.4
Engine last updated . Checked against 2 independently-derived tests — how we verify calculators. Built by Paul Gunder, a software engineer, not a licensed financial, medical, or legal professional.
Frequently Asked Questions
Why doesn't my current age affect my projected Norwood stage?
Projected Norwood stage is built entirely from Current Norwood stage, the progression rate (set by Age hair loss began and family history), and Years to project -- Current age never enters that formula. It's used only to calculate Observed rate, a separate, informational look-back at how fast you've progressed since onset.
Why does an earlier age of onset predict faster progression?
The calculator assigns a base progression rate by Age hair loss began: under 20 gets the fastest rate (0.25 stages/year), while onset at 40 or later gets the slowest (0.08). This reflects the clinical pattern that earlier-onset male pattern baldness tends to be more aggressive, and it's the single input that moves Projected Norwood stage the most in this calculator.
Why does my maternal grandfather's baldness matter more than my father's?
The androgen receptor (AR) gene most strongly linked to pattern baldness sits on the X chromosome, which men inherit from their mother -- so a bald maternal grandfather applies a 1.35x progression multiplier versus 1.2x for a bald father alone. Having both family history flags set compounds to a 1.5x multiplier on the base progression rate.
Can Projected Norwood stage ever exceed 7?
No -- both the with-treatment and without-treatment projections are capped at Norwood stage 7, the scale's most severe classification (only a horseshoe pattern of hair remains). Projecting further into the future or entering a faster progression rate cannot push the projected stage past that ceiling once it's reached.
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