Visual density maps make the abstract FU/cm2 metric tangible by showing what different density levels look like on a real scalp. This gallery presents anonymized density map examples at every major Norwood and Ludwig stage, giving you a reference for interpreting your own readings.
How to Read a Density Map
Before exploring the gallery, understand the color system. myhairline.ai density maps use a consistent color gradient across all users.
| Color | Density Range | Clinical Meaning |
|---|---|---|
| Deep Blue | Below 100 FU/cm2 | Severe thinning, visible scalp |
| Light Blue | 100 to 140 FU/cm2 | Moderate thinning |
| Green | 140 to 200 FU/cm2 | Normal density range |
| Yellow | 200 to 230 FU/cm2 | Above average density |
| Red | Above 230 FU/cm2 | High density, typically donor area |
The map overlays these colors on a top-down scalp diagram, creating a visual snapshot of density distribution across all zones.
Norwood Stage Gallery
Norwood 2: Slight Temple Recession
The Norwood 2 map shows green across most of the scalp with light blue patches beginning at the frontal temples. The recession is subtle and often missed without measurement.
Typical density readings:
- Frontal temples: 130 to 160 FU/cm2
- Mid-scalp: 180 to 220 FU/cm2
- Vertex: 170 to 210 FU/cm2
- Donor area: 200 to 230 FU/cm2
Graft requirements at this stage range from 800 to 1,500 if transplant is considered. Most dermatologists recommend medication first.
Norwood 3: Deep Temple Recession
The Norwood 3 map shows distinct blue zones at the temples forming a clear M-shape. The mid-scalp and vertex remain green.
Typical density readings:
- Frontal temples: 80 to 120 FU/cm2
- Frontal hairline (center): 140 to 170 FU/cm2
- Mid-scalp: 170 to 210 FU/cm2
- Vertex: 160 to 200 FU/cm2
Transplant candidates at Norwood 3 typically need 1,500 to 2,200 grafts.
Norwood 3V: Temple Recession Plus Vertex Thinning
The 3V map introduces a second blue zone at the crown in addition to the temporal recession. This dual-zone pattern distinguishes 3V from standard Norwood 3.
Typical density readings:
- Frontal temples: 80 to 120 FU/cm2
- Vertex: 110 to 150 FU/cm2
- Mid-scalp: 160 to 200 FU/cm2
Graft requirements increase to 2,000 to 2,800, covering both the frontal and vertex zones.
Norwood 4: Enlarged Recession
The Norwood 4 map shows blue extending further back from the temples and a larger blue zone at the vertex. A bridge of green density remains between the two thinning areas.
Typical density readings:
- Frontal zone: 70 to 110 FU/cm2
- Mid-scalp bridge: 130 to 170 FU/cm2
- Vertex: 90 to 130 FU/cm2
Graft requirements: 2,500 to 3,500.
Norwood 5: Narrowing Bridge
The bridge of density between the frontal and vertex zones narrows significantly at Norwood 5. The density map shows large blue areas front and back with a thin strip of green between them.
Typical density readings:
- Frontal: 60 to 100 FU/cm2
- Mid-scalp bridge: 100 to 140 FU/cm2
- Vertex: 70 to 110 FU/cm2
Graft requirements: 3,000 to 4,500.
Norwood 6: Bridge Lost
At Norwood 6, the bridge between frontal and vertex zones disappears. The density map shows one continuous blue zone across the top of the scalp, framed by the green/yellow horseshoe-shaped donor area.
Typical density readings:
- Central scalp: 50 to 90 FU/cm2
- Donor area: 180 to 220 FU/cm2
Graft requirements: 4,000 to 6,000.
Norwood 7: Most Extensive Pattern
The Norwood 7 map shows deep blue across the entire top and front of the scalp. Only a narrow band of green remains at the sides and back.
Typical density readings:
- Central scalp: Below 60 FU/cm2
- Donor area: 170 to 210 FU/cm2
Graft requirements: 5,500 to 7,500. Multiple sessions are often necessary.
Ludwig Stage Gallery (Female Pattern)
Female hair loss follows a different pattern, measured on the Ludwig scale.
Ludwig I: Diffuse Thinning at the Part Line
The density map shows a subtle blue line along the central part with green surrounding it. The frontal hairline remains intact.
Ludwig II: Widening Part
The blue zone expands from a line into a band, 2 to 3 centimeters wide. Density in the affected zone drops to 100 to 140 FU/cm2.
Ludwig III: Near-Complete Top Thinning
Most of the scalp crown shows light to deep blue. The frontal hairline fringe remains but is thinner. Central density can drop below 80 FU/cm2.
Treatment Response Maps
The most encouraging density maps are the ones that change color over time. A density map that shifts from blue to green in thinning zones after 12 months of treatment confirms that your protocol is working.
Typical treatment response by zone:
| Zone | Average Density Gain (12 months, finasteride + minoxidil) |
|---|---|
| Vertex | +20 to 30 FU/cm2 |
| Mid-scalp | +15 to 25 FU/cm2 |
| Frontal | +10 to 15 FU/cm2 |
| Temples | +5 to 10 FU/cm2 |
Learn more about understanding hair density measurements for detailed context on what these numbers mean.
Build Your Own Gallery
Every scan you take with myhairline.ai adds to your personal density map timeline. Start building yours today at myhairline.ai/analyze and see exactly where your hair stands.
Medical disclaimer: This article is for informational purposes only and does not constitute medical advice. Individual results vary. Consult a dermatologist for personalized treatment planning.