Clinical Reference
Evidence, formulas, and clinical context
More Respiratory Calculators
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A-a Gradient (Alveolar-arterial Gradient)
Assesses oxygenation efficiency and helps determine the cause of hypoxemia (e.g., V/Q mismatch vs. shunt vs. diffusion defect).
P/F Ratio (PaO₂/FiO₂)
Core ICU tool to assess ARDS severity and determine ventilator settings. Used daily in intubated patients.
Bicarbonate Deficit Calculator
Helps guide bicarb replacement in metabolic acidosis — often used in ICU or renal overlap.
Respiratory Compensation (Winter’s Formula)
Estimates expected respiratory compensation in metabolic acidosis — key in acid-base analysis.