Lung capacity, tidal volume, FEV1/FVC ratio, and respiratory function calculators. Browse our free pulmonary tools below — all calculators are instant, accurate, and require no sign-up.
Physiologic Dead Space Calculator — Calculate physiologic dead space using the Bohr equation. Includes VD/VT ratio, alveolar ventilation, and dead space composition breakdown.
FEV1/FVC Ratio Calculator — Calculate FEV1/FVC ratio with COPD GOLD staging, predicted values, and bronchodilator reversibility testing. Interpret spirometry patterns.
Lung Cancer Risk Calculator for Smokers — Estimate lung cancer risk based on smoking history, age, COPD, and family history. Determine LDCT screening eligibility per USPSTF 2021 guidelines.
Total Lung Capacity Calculator — Calculate predicted total lung capacity, vital capacity, residual volume, and FRC by age, height, and sex. Visual breakdown of all lung volumes.
Lung Nodule Growth Rate Calculator — Calculate volume doubling time for lung nodules. Includes Fleischner Society guidelines, Lung-RADS categories, and malignancy risk stratification.
PaO2/FiO2 Ratio (P/F Ratio) Calculator — Calculate the P/F ratio for ARDS severity classification per Berlin 2012 criteria. Includes A-a gradient, oxygenation index, and S/F ratio estimation.