Pulmonology Calculators — Clinical Medicine
Support respiratory assessment with validated pulmonary tools. The A-a gradient calculator quantifies the alveolar-arterial oxygen difference, the PaO2/FiO2 ratio grades oxygenation and ARDS severity, and the FiO2 estimation and tidal-volume calculators guide oxygen delivery and lung-protective ventilator settings. Each cites its formula and is provided for educational reference only — verify every value with a qualified clinician before acting.
All Pulmonology Calculators
Calculate the alveolar-arterial oxygen gradient to evaluate gas exchange efficiency.
Estimate FiO2 delivered by nasal cannula and face mask at various flow rates.
Calculate the P/F ratio to classify ARDS severity (mild, moderate, severe).
Calculate lung-protective tidal volume (6-8 mL/kg IBW) for mechanical ventilation.
About Pulmonology Calculators
Support respiratory assessment with validated pulmonary tools. The A-a gradient calculator quantifies the alveolar-arterial oxygen difference, the PaO2/FiO2 ratio grades oxygenation and ARDS severity, and the FiO2 estimation and tidal-volume calculators guide oxygen delivery and lung-protective ventilator settings. Each cites its formula and is provided for educational reference only — verify every value with a qualified clinician before acting.
Whether you need to solve a one-time problem or verify your own calculations, these free tools cover the most common pulmonology scenarios. All results are computed in your browser — no data is sent to any server.
What You Can Calculate
This section includes 4tools: A a Gradient Calculator, Fio2 Estimation Calculator, Pao2 Fio2 Ratio Calculator, Tidal Volume Calculator. Each calculator is free to use with no signup required.