Endotracheal Tube Size & Fixation Depth
Endotracheal Tube Size & Fixation Depth
Starting estimates for ETT internal diameter and insertion/fixation depth for oral vs nasal routes. Confirm final position clinically.
Last updated
2026-01-08
Medical Wizardry • Calculators
Airway support
Inputs
Infants: decimals allowed (e.g., 0.50 years ≈ 6 months).
Used for infant/neonate depth estimate and plausibility checks.
If entered, a height-based depth estimate will be shown.
Adult sizing and fixation-depth heuristics vary; use as a starting point only.
Nasal depth estimates are guides; confirm with capnography and clinical assessment.
Safety: Confirm tracheal (not endobronchial) position with capnography and clinical assessment; reassess after head/neck movement. Imaging and/or fiberoptic confirmation as indicated.
Results
Category
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Route
Oral
Suggested ETT internal diameter (millimeters)
Uncuffed ETT
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Cuffed ETT
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Clinical note
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Keep adjacent sizes available; cuff pressure strategy and airway/procedure matter.
Estimated fixation depth (centimeters)
Diameter method
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Age method
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Weight method
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Height method
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Suggested starting fixation depth
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Median of available methods (route-adjusted); always confirm clinically.
Adult fixation depth note (when applicable)
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Made by Medical Wizardry
Disclaimer: Decision support only. Final tube size/depth selection must consider airway anatomy, pathology, procedure, cuff pressure strategy, and local protocols.
