Horowitz Index (P/F Ratio)
Enter PaO2 (mmHg) and FiO2 (0.21-1.0 or %); Berlin mild 200-300, moderate 100-200, severe <100.
Calculator
How it works
P/F ratio supports ARDS severity teaching per Berlin definition.
Limits
Requires minimum PEEP/FiO2 context per Berlin—confirm locally.
Educational tool only—not for diagnosis or treatment decisions.