Oxygen delivery starts in the alveolus and ends at the mitochondria — these calculators track every step. From the alveolar gas equation and A-a gradient that localize the failure, to CaO₂ and DO₂ that quantify what reaches the tissues, this set covers the full oxygenation chain used daily in the ICU, ED, and pulmonary clinic.
13 calculators available
Alveolar-to-arterial oxygen gap — tells hypoventilation apart from a lung transfer problem.
Arterial oxygen as a fraction of alveolar oxygen — steadier than the A-a gradient across FiO₂ changes.
Grades hypoxemia severity — the core metric for diagnosing and staging ARDS.
Combines mean airway pressure with the PF ratio — used in severe failure and ECMO decisions.
Total oxygen carried per deciliter of arterial blood — why hemoglobin matters as much as PaO₂.
Oxygen left in the blood after tissues extract what they need.
How fast the body uses oxygen, from the Fick principle.
Total oxygen the heart pumps to the body each minute.
Fraction of blood passing the lungs that never picks up oxygen.
Estimates delivered oxygen percentage from nasal cannula flow rate.
High-FiO₂ rule of thumb for whether oxygenation matches the oxygen given.
Predicts blood oxygen at cabin altitude to assess fitness to fly.
The alveolar gas equation on its own — expected oxygen inside the alveoli.