Age-based formula for selecting endotracheal tube size (internal diameter in mm)

Uncuffed tube	Cuffed tube*
4 + (age in years/4)	3.5 + (age in years/4)

Additional tubes one size larger and one size smaller than calculated should also be available.

*Use formula for children 2 years of age and older. Use 3.5 mm internal diameter cuffed endotracheal tube for children 1 to <2 years of age and a 3.0 mm internal diameter cuffed endotracheal tube for children <1 year of age.

Formula for cuffed tubes from:
Litman R, Fiadjoe J, Stricker P, et al. The pediatric airway. In: Cote C, Lerman J, Anderson B (Eds). A Ptractice of Anesthesia for Infants and Children, 5th ed. Saunders-Elsevier, Philadelphia 2013. p 237.

Graphic 72932 Version 4.0

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Age-based formula for selecting endotracheal tube size (internal diameter in mm)