FiO₂ from Two Gas Sources Calculator

Calculates final FiO₂ when two gas streams with different oxygen concentrations are mixed.

Inputs

Color mode links each input to the matching equation term and solving arithmetic.

Equation and Work

Equation:
Solving steps:
Final FiO₂
—
%
Total flow
—
L/min
Weighted O₂ flow
—
L/min O₂

Clinical Significance

Final FiO₂ when two gas streams with different oxygen concentrations are mixed.

This calculator expands that idea by identifying the relevant measured values, substituting the selected inputs, and carrying the arithmetic through in the solving steps.

Useful when combining oxygen, air, or blender outputs and no oxygen analyzer value is available.

Assumes complete mixing and accurate source FiO₂/flow values.

References (APA 7th Edition)

  1. Chang, D. W. (2020). Respiratory Care Calculations (Revised 4th ed.). Jones & Bartlett Learning. Formula content adapted from the uploaded text/reference packet.