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This version was machine-translated from German and has not been medically reviewed. The authoritative version is the German version.

ETT size / tube size by age and weight

Tube internal diameter uncuffed (Cole) and cuffed (Khine, Motoyama) with insertion depth

Details

Calculation aid for healthcare professionals: the calculator reproduces what the sources cited assign to the inputs. Clinical assessment and every treatment decision remain with the treating physician. Inputs and results are not stored.

Frequently asked questions

ETT size / tube size by age and weight: What does this calculator compute?

Estimates the internal diameter of the endotracheal tube by age (uncuffed: 4 + age/4; cuffed: 3 + age/4 under 2 years or 3.5 + age/4 from 2 years) or, in newborns, by weight, with insertion depth (3 × ID, age/2 + 12, Tochen formula) and the notes of the ERC guideline 2025 on cuffed tubes (age/4 + 3.5 up to 8 years, cuffed tubes for all children).

ETT size / tube size by age and weight: Which sources is this calculator based on?

Djakow J, et al.: European Resuscitation Council Guidelines 2025: Paediatric Life Support (Resuscitation 215 Suppl 1:110767) (2025); Van de Voorde P, Turner NM, Djakow J, et al.: European Resuscitation Council Guidelines 2021: Paediatric Life Support (Resuscitation 161:327–387) (2021); Cole F: Pediatric formulas for the anesthesiologist (AMA J Dis Child 94:672–673) (1957); Khine HH, Corddry DH, Kettrick RG, et al.: Comparison of cuffed and uncuffed endotracheal tubes in young children during general anesthesia (Anesthesiology 86:627–631) (1997); Duracher C, Schmautz E, Martinon C, Faivre J, Carli P, Orliaguet G: Evaluation of cuffed tracheal tube size predicted using the Khine formula in children (Paediatr Anaesth 18:113–118) (2008); Motoyama EK, Davis PJ (eds.): Smith's Anesthesia for Infants and Children, edition 5, p. 272–275 (1990); Tochen ML: Orotracheal intubation in the newborn infant: a method for determining depth of tube insertion (J Pediatr 95:1050–1052) (1979)