The Endotracheal tubes (ETT) are used in a medical treatment for the supply of oxygen to the patients in emergency cases. The endotracheal tube is placed into the windpipe (trachea) through the mouth or nose. Endotracheal (ETT) tubes are mostly made of polyvinylchloride (PVC) and are single-use. Find here the size of an Endotracheal Tube (ETT) for a newborn, toddler, children or adults based on their age, height and weight. Select the list of options from the drop down menu and the et tube size calculator will show you the estimated size of an Endotracheal Tube (ETT) that is to be used for the patient.