// multi-utility computation suite · offline · instant · precise
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health.pulse-oximetry-spo2 Calculator
Estimates SpO₂ from the R-ratio (red/infrared) photoplethysmography signal and calculates haemoglobin oxygen content at the measured saturation. Pulse oximetry overestimates SpO₂ in carboxyhaemoglobin poisoning — this is the limitation that makes co-oximetry necessary in fire victims.
Inputs
Red Light Ratio
Reference formula or conversion factor shown for context.
Infrared Ratio
Reference formula or conversion factor shown for context.
Results
estimated SpO₂ (%)
The value at the specified point or condition.
R ratio (660/940 AC/DC)
The proportional relationship between two quantities.
clinical classification
Category assigned based on where the computed value falls on a defined scale. Check which standard or guideline defines these boundaries.
SpO₂ ≈ 110 - 25R
Reference formula or conversion factor shown for context.
R=1.0
Reference formula or conversion factor shown for context.