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Hair Loss Stage Calculator

Work out hair loss stage instantly with clear inputs, formula shown and shareable results.

About Hair Loss Stage Calculator

Compares measured hair density with an unaffected baseline such as the occipital scalp, and checks daily shedding against the usual 50 to 100 hairs.

Formula

Density loss

Loss (%) = (baseline density - current density) / baseline density x 100; typical shedding is 50-100 hairs a day

Worked example

With the default values below, Hair Loss Stage Calculator returns Density lost against baseline of 40.0%. Change any input above and every figure here is recalculated in your browser.

Inputs used

Current hair densityaccepts 5–200 hairs/cm2
60 hairs/cm2
Baseline or occipital densityaccepts 20–250 hairs/cm2
100 hairs/cm2
Hairs shed per dayaccepts 10–500
120

Results

Density lost against baseline
40.0%
Thinning band
Moderate thinning
Shedding check
Shedding above the usual 50 to 100 hairs a day
Density shortfall
40.0 hairs/cm2

Step by step

  1. 1Values used
  2. 2Density loss
  3. 3Density lost against baseline= 40.0
  4. 4Thinning band= Moderate thinning
  5. 5Shedding check= Shedding above the usual 50 to 100 hairs a day
  6. 6Density shortfall= 40.0 hairs/cm2

Assumptions and limits

  • The result is derived only from the 3 inputs listed above. Anything not among them is not part of the calculation.
  • In particular, this calculator does not take inflation, tax, fees or charges or compounding frequency into account.
  • Figures are rounded for display to 1 decimal place, so totals built from several rounded parts can differ slightly from the unrounded arithmetic.
  • Educational estimate only. Not a substitute for professional clinical judgement, and must not be used to make treatment or dosing decisions.
  • This is an estimate for general information and not professional medical advice. See the full disclaimer for the limits that apply to this kind of calculator.

How these calculators are built and tested is described on the Methodology page. If a figure looks wrong, please report it.

Educational estimate only. Not a substitute for professional clinical judgement, and must not be used to make treatment or dosing decisions.

Frequently Asked Questions

Why use the occipital scalp as baseline?

In androgenetic alopecia the occipital region is largely spared, so it approximates the original density.

Is visible thinning early or late?

Visible thinning usually needs about half the density to be lost, so measurement detects change earlier.

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