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Calculate the PaO₂/FiO₂ ratio and classify ARDS severity per the Berlin Definition (2012). Derived from ARDS Definition Task Force JAMA 2012, LITFL, and Rice 2007. Not medical advice.
Execution
Fill in the form, run the tool, and review the result in one place.
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Tool usage guide
Calculate the PaO₂/FiO₂ ratio from arterial PaO₂ and inspired oxygen fraction, then view the corresponding ARDS severity category based on the Berlin Definition (2012). The result is provided as JSON and is not medical advice.
Background
A patient has a PaO₂ of 60 mmHg while receiving 100% inspired oxygen.
Problem
The clinician needs the P/F ratio and its corresponding severity category.
How to use
Enter 60 for PaO₂, select FiO₂ 1.00, and leave Decimal Places at 0.
{"pao2":60,"fio2":"1.00","decimalPlaces":0}Outcome
The tool returns P/F = 60 and classifies it as Severe ARDS (P/F ≤ 100), with a mortality estimate of approximately 45%.
Background
An arterial blood gas shows PaO₂ 65 mmHg while the patient receives 30% inspired oxygen.
Problem
The trainee wants to calculate oxygenation severity without manually dividing the values.
How to use
Enter 65 for PaO₂, select FiO₂ 0.30, and use 0 decimal places.
{"pao2":65,"fio2":"0.30","decimalPlaces":0}It is PaO₂ divided by FiO₂ and is used to assess oxygenation impairment.
Enter arterial PaO₂ in mmHg.
Use the inspired oxygen fraction as a decimal, such as 0.21 for room air, 0.30 for 30%, or 1.00 for 100% oxygen.
The categories are based on the P/F ratio: greater than 300, 200–300, 100–200, and 100 or below.
No. It calculates and classifies the P/F ratio; ARDS diagnosis also requires clinical assessment and Berlin Definition criteria.
Outcome
The tool returns P/F = 217 and classifies it as Mild ARDS (P/F 200–300), with a mortality estimate of approximately 27%.