This version was machine-translated from German and has not been medically reviewed. The authoritative version is the German version.
ETT depth / tube depth
Insertion depth from the lip: 3 × inner diameter, age/2 + 12 and Tochen formula for newborns
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 depth / tube depth: What does this calculator compute?
Estimates the oral insertion depth of the endotracheal tube (from the lip) using the rules of thumb 3 × internal diameter and age/2 + 12 cm and, in newborns, the Tochen formula (1.17 × kg + 5.58 cm); nasal approximately 2–3 cm deeper.
ETT depth / tube depth: Which sources is this calculator based on?
Tochen ML: Orotracheal intubation in the newborn infant: a method for determining depth of tube insertion (J Pediatr 95:1050–1052) (1979)