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Calculate the Oxygenation Index from MAP, FiO₂ and PaO₂. Includes ARDS severity grading and ECMO threshold guidance.
Enter values below and click the button to get your result.
For educational reference only. Always verify results with your clinical team and follow your facility's protocols.
Enter the Mean Airway Pressure (MAP) in cmH₂O
Enter the FiO₂ as a percentage (21–100)
Enter the PaO₂ in mmHg from the ABG
Click 'Calculate OI' to get the Oxygenation Index and severity grade
Formula: OI = (MAP × FiO₂ × 100) / PaO₂
OI < 5: Normal or mild impairment
OI 5–10: Mild ARDS
OI 10–20: Moderate ARDS — consider prone positioning
OI ≥ 20: Severe ARDS — consider ECMO referral
Sharpen your clinical skills and earn Continuing Education Units (CEUs) through our expert-led respiratory therapy lectures — available online and at destination conferences.
Use our free CEU Tracker to manage your continuing education and never miss a renewal deadline.