Oxygen Delivery Equivalence Calculator

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Your patient is on High Flow oxygen via a gas blender (ie Airvo2).
What wall-oxygen rate will deliver the same amount of oxygen to the patient?

Oxygen Therapy Equivalence Calculator

Estimate oxygen-source flow for an air/oxygen blender supplying adult high-flow nasal oxygen
Version 1.0.0

Blended high-flow nasal oxygen

Estimate the oxygen and air inlet flows required to make the selected total flow and set oxygen fraction (FiO₂). This is an ideal gas-mixture calculation, not a device conversion or a prediction of the FiO₂ actually reaching the alveoli.

Set FiO₂ %
Total high-flow rate L/min
Estimated oxygen inlet flow — L/min oxygen
Estimated air inlet flow — L/min air
Oxygen carried in the mixed gas — L/min oxygen content

Interpretation

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Do not set treatment from this estimate. Confirm the prescribed FiO₂ on the blender and use the device manufacturer's operating limits. Leaks, cannula fit, mouth opening, patient inspiratory demand and room-air entrainment affect delivered FiO₂ and airway pressure.

The legacy page also displayed “maximum PEEP” as flow ÷ 10. That rule has not been retained: positive end-expiratory pressure (PEEP) from high-flow nasal oxygen is variable and cannot be calculated safely from flow alone.

No clinical values are intentionally saved by this control.