Oxygenation Index
Result
Calculated result
0.6666666667
Based on the values entered.
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Oxygenation Index — free online calculator.
Formula
OI = FiO₂(%) × MAP / PaO₂; P/F = PaO₂/FiO₂
- Oxygenation Index calculates its result from Pao2, Fio2. It uses the formula OI = FiO₂(%) × MAP / PaO₂; P/F = PaO₂/FiO₂. Change any input to recalculate the result instantly. This is an informational calculation and is not medical advice.
- The main inputs are Pao2, Fio2. Enter them in the units and format shown in the calculator.
- Use the measurement units shown beside each field. The result is an estimate and should be interpreted in context.
- Changing any input above recalculates the result with the same calculation engine used by this page.
Example: Oxygenation Index
Inputs
- Pao2: 2
- Fio2: 3
Using Pao2 = 2, Fio2 = 3, the calculated result is 0.6666666667.
Sample result: Calculating…
Frequently asked questions
What does the Oxygenation Index calculate?
Oxygenation Index — free online calculator.
Which values should I enter?
Enter Pao2, Fio2 using the units and format shown beside each field.
What formula does this calculator use?
The calculator uses the following relationship: OI = FiO₂(%) × MAP / PaO₂; P/F = PaO₂/FiO₂.
Why might my result differ from another source?
Results can differ because measurement methods, rounding and assumptions vary. This calculator is an estimate and is not a medical diagnosis.
Does the result update automatically?
Yes. Changing an input updates the result using the same calculation engine shown on this page.