FEV1/FVC Ratio Calculator
Calculate the FEV1/FVC ratio with percent-predicted context, fixed-ratio obstruction screening, and bronchodilator response framing.
Free Pulmonary Calculators
7 toolsLung capacity, tidal volume, FEV1/FVC ratio, and respiratory function calculators. Browse our free pulmonary tools below — no sign-up required.
Lung Cancer Risk Calculator for Smokers
Estimate smoking-related lung cancer risk with a simplified worksheet and check low-dose CT screening eligibility against published 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.
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.
Physiologic Dead Space Calculator
Calculate physiologic dead space using the Bohr equation. Includes VD/VT ratio, alveolar ventilation, and dead space composition breakdown.
Tidal Volume Calculator (Lung-Protective Ventilation)
Calculate an ideal-body-weight-based tidal-volume worksheet and compare height-based targets across common ventilation contexts.
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.