🧒 Pediatric ETT Size & Depth
Estimate pediatric endotracheal tube size and insertion depth by age.
Pediatric ETT Size & Depth
Age (years)
When to use
Quick airway preparation for pediatric intubation.
How it works
Uncuffed ID = age/4 + 4; cuffed = age/4 + 3.5 (mm). Depth ≈ ID × 3 (cm) or age/2 + 12. Infants < 1 y by weight.
Key points
- Keep ± 0.5 sizes available.
- Confirm position with end-tidal CO₂, auscultation and chest radiograph.
- Infants are sized by weight, not the age formula.
References
Decision support for licensed clinicians only; not a substitute for clinical judgement, diagnosis or local protocols.