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Calcimator

Oxygen Therapy Calculator

O2 flow rate to FiO2 conversion and cylinder duration estimation.

Inputs

Results

Estimated FiO2 (%)

29%

Cylinder Duration (min)280
Cylinder Duration (hrs)4.7
Estimated PAO2 (mmHg)156.8
Flow Rate (L/min)2
Approx Min Flow2
How to Use This Calculator
  1. Enter the O2 flow rate (L/min) and select the delivery device (nasal cannula, simple mask, or NRB).
  2. Select cylinder size and enter current cylinder pressure (psi).
  3. Set target SpO2 (%) to confirm the prescribed flow rate should achieve your oxygenation goal.
  4. Review estimated FiO2, cylinder duration in minutes and hours.
  5. Plan oxygen refills based on duration -- keep a backup cylinder when duration is less than 8 hours.
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