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Calculations must be re-checked, shouldn't be used alone for patient care, and don't substitute for professional judgment. See our full disclaimer.
Estimates ET tube size based on age.
Predicted Size Uncuffed Tube = (Age / 4) + 4
Predicted Size Cuffed Tube = (Age / 4) + 3
This formula typically is applicable to children ages 1-12. Below that, consider an endotracheal tube reference card; above 12, typically most adult sizes (6.5-8.0) can be used.
Calculations must be re-checked and should not be used alone to guide patient care nor should they substitute for clinical judgement. disclaimer