Enter the arterial p02 (P) and the fraction percent of inspired oxygen (FI02) into the PF Ratio Calculator. The calculator will evaluate and display the PF Ratio.

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## PF Ratio Formula

The following formula is used to calculate the PF Ratio.

**PFR = P/F**

- Where PFR is the PF Ratio
- P is the arterial p02 (P)
- F is the fraction percent of inspired oxygen (FI02)

## How to Calculate PF Ratio?

The following example problems outline how to calculate PF Ratio.

Example Problem #1:

- First, determine the arterial p02 (P).
- The arterial p02 (P) is given as: 86.

- Next, determine the fraction percent of inspired oxygen (FI02).
- The fraction percent of inspired oxygen (FI02) is provided as: .80.

- Finally, calculate the PF Ratio using the equation above:

PFR = P/F

The values given above are inserted into the equation below and the solution is calculated:

PFR = 86/.80 = 107.5

Example Problem #2:** **

For this problem, the variables required are provided below:

arterial p02 (P) = 90

fraction percent of inspired oxygen (FI02) = .70

Test your knowledge using the equation and check your answer with the calculator above.

PFR = P/F** = ?**