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Lung Age from FEV1 Spirometry Calculator

Lung age from predicted vs actual FEV1 — smoking impact.

Estimates a patient's "lung age" from measured FEV1 and reference predicted FEV1 to motivate smoking cessation.

Dr. Helena Ortiz By Dr. Helena Ortiz
Published Last reviewed 1 min read

Inputs

Results

Enter values and click Calculate to see results.
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How to use this calculator

  1. Fill in the inputs above using the units you already have.
  2. Values update automatically as you type — no submit button needed.
  3. Hover any result row for the underlying formula and intermediate values.

Formula

Lung_age (male) = (0.0414×height−FEV1+2.19)/0.0244

In depth

Estimates a patient's "lung age" from measured FEV1 and reference predicted FEV1 to motivate smoking cessation.