Estimate the PaO2/FiO2 ratio from arterial oxygen and inspired oxygen percent.
| P/F | – |
Use this calculator for P/F = PaO2 ÷ (FiO2 ÷ 100). Enter PaO2 in mmHg and FiO2 as a percent (21 on room air, 100 on pure oxygen). Berlin ARDS sketches often sit around 300 mild, 200 moderate, and 100 severe. Altitude, PEEP, and mixed venous oxygen change how the ratio reads. This is not an oxygenation-index (MAP × FiO2 / PaO2) page.
PaO2: Arterial oxygen tension, mmHg.
FiO2 (%): Inspired oxygen percent.
P/F: PaO2/FiO2 ratio, mmHg.
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