Plan oxygen delivery, estimate cylinder duration, and compare device output. Get fast clinical guidance with practical calculations for daily care decisions.
| Case | Device | Flow Rate (L/min) | Estimated FiO2 (%) | Available Gas (L) | Estimated Duration (hours) |
|---|---|---|---|---|---|
| Patient A | Nasal Cannula | 3.0 | 32 | 180 | 10.00 |
| Patient B | Simple Mask | 6.0 | 44 | 240 | 6.67 |
| Patient C | Non-Rebreather | 12.0 | 80 | 360 | 3.33 |
| Patient D | Venturi Mask | 8.0 | 40 | 300 | 5.00 |
1. Planned oxygen need: Oxygen Needed = Flow Rate × Time.
2. Cylinder usable pressure: Usable Pressure = Cylinder Pressure − Safe Residual Pressure.
3. Available cylinder gas: Available Gas = Cylinder Factor × Usable Pressure.
4. Cylinder duration: Duration = Available Gas ÷ Flow Rate.
5. Flow per kilogram: L/kg/min = Flow Rate ÷ Patient Weight.
6. Device FiO2 estimate: The calculator uses common bedside approximations for selected devices.
These formulas support quick planning. Actual delivered oxygen can change with mask fit, inspiratory demand, patient effort, leaks, humidification, and equipment variation.
Choose the oxygen delivery device first.
Enter the flow rate in liters per minute.
Enter planned treatment time in minutes.
Add cylinder factor and current cylinder pressure.
Set a safe residual pressure value.
Enter patient weight and target dose.
Provide target FiO2 for Venturi or high flow systems.
Click calculate to view supply, duration, and estimated FiO2.
Use CSV or PDF export for documentation needs.
It estimates oxygen demand, approximate device FiO2, cylinder supply, treatment duration, and flow per kilogram. It helps compare planned therapy against available cylinder capacity.
No. The FiO2 values are bedside estimates. Actual delivered oxygen varies with patient breathing pattern, mask seal, room air entrainment, and equipment performance.
Residual pressure prevents complete cylinder depletion. It leaves a safety margin for transport, switching equipment, and unexpected patient needs during oxygen therapy.
Cylinder factor converts stored pressure into available gas volume. Different cylinder sizes use different factors. Enter your local factor based on the cylinder type used.
It can support planning, but pediatric oxygen therapy needs careful clinical supervision. Always confirm device suitability, target saturation, and weight-based requirements with qualified clinicians.
Higher flow consumes stored oxygen faster. When oxygen use rises, the same cylinder empties sooner, reducing total treatment time available from that supply.
No. This calculator is educational and operational. It does not replace patient assessment, oxygen titration, device checks, blood gas interpretation, or institutional protocols.
Export results when you need to document assumptions, share supply planning, compare scenarios, or keep a quick record for training and operational review.
Important Note: All the Calculators listed in this site are for educational purpose only and we do not guarentee the accuracy of results. Please do consult with other sources as well.