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 the FEV1/FVC ratio with percent-predicted context, fixed-ratio obstruction screening, and bronchodilator response framing.
Lung Cancer Risk Calculator for Smokers — Estimate smoking-related lung cancer risk with a simplified worksheet and check low-dose CT screening eligibility against current screening criteria.
Lung Nodule Growth Rate Calculator — Calculate lung-nodule volume doubling time and compare it with Fleischner and Lung-RADS reference frameworks in a follow-up worksheet.
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.
PaO2/FiO2 Ratio (P/F Ratio) Calculator — Calculate the P/F ratio as a bedside oxygenation measure and review it alongside Berlin ARDS severity bands, A-a gradient, oxygenation index, and estimated S/F ratio.