Pediatric ETT Size & Depth

Estimate uncuffed & cuffed ETT size by age, plus depth at the lips (age/2 + 12).

Age

years

1 – 18 years

Enter age and tap “Calculate ETT”

Uncuffed size (mm ID) = (age/4) + 4 · Cuffed size = (age/4) + 3 · Depth (cm at lips) = (age/2) + 12

📚 References: MDCalc, Medscape. Always have extra tubes & confirm placement with capnography & auscultation. Learn more

Cuffed tubes are preferred. Depth is a guide; confirm with chest X-ray. This tool is for educational purposes.