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Wound Healing Time Calculator

Work out wound healing time instantly with clear inputs, formula shown and shareable results.

About Wound Healing Time Calculator

Projects wound closure from the measured weekly percentage area reduction, the prognostic marker used in chronic wound care.

Formula

Exponential area reduction

Area(t) = initial area x (1 - weekly reduction)^t; weeks to heal = ln(initial / target) / -ln(1 - weekly reduction)

Worked example

With the default values below, Wound Healing Time Calculator returns Estimated time to closure of 29.5. Change any input above and every figure here is recalculated in your browser.

Inputs used

Current wound areaaccepts 0.1–500 cm2
12 cm2
Weekly area reductionaccepts 1–60 %
15 %
Area considered healedaccepts 0.01–5 cm2
0.1 cm2

Results

Estimated time to closure
29.5 weeks
Projected area at four weeks
6.26 cm2
Projected reduction at four weeks
47.8%

Step by step

  1. 1Values used
  2. 2Exponential area reduction
  3. 3Estimated time to closure= 29.5 weeks
  4. 4Projected area at four weeks= 6.26 cm2
  5. 5Projected reduction at four weeks= 47.8

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 2 decimal places, 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 is the four-week figure highlighted?

Failure to reduce area by about 40 to 50% in four weeks predicts delayed healing and prompts review of the treatment plan.

Is healing really exponential?

Area reduction is approximately exponential in the healing phase, but infection, pressure and perfusion change the rate.

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