Oxygenation & Gas Exchange
S/F Ratio
Development preview · Needs clinical review · Not validated for clinical use. Last clinical review: pending.
Calculated result
Enter the required values and units to calculate.
Formula & limitations
S/F = SpO₂ (%) / (FiO₂ (%) / 100)
Uses the numerical saturation percentage. No conversion to a P/F ratio or severity score; pulse oximetry limitations remain relevant.