P/F Ratio Calculator

Free calculate P/F ratio (PaO2/FiO2). This is an educational tool only - always consult a healthcare provider.

Blood Gas Values

Or enter as percentage (21-100%)

Results

Enter values to calculate P/F ratio

About P/F Ratio

  • • P/F = PaO2 / FiO2
  • • Normal: >400
  • • Mild ARDS: 200-300
  • • Moderate ARDS: 100-200
  • • Severe ARDS: <100