Pediatric ETT Size Calculator — Endotracheal Tube Size Estimate

Calculates estimated endotracheal tube (ETT) internal diameter for pediatric intubation using age-based formulas. Most commonly used formula for uncuffed ETT: (Age/4) + 4. For cuffed ETTs (preferred in modern PICU practice): (Age/4) + 3.5. Tube depth (cm at the lip) estimation: (Age/2) + 12. Multiple alternative formulas exist (Luten, weight-based). Broselow tape provides length-based ETT sizing for patients < 35 kg.