Pediatric ETT Size & Depth — free guideline decision tool
Estimate pediatric endotracheal tube size and insertion depth by age.
Open guideline tool →Guideline-based
Implements the decision logic from published clinical guidelines.
Runs in your browser
No installation. Enter the patient's values and get a guideline recommendation instantly.
Data stays local
Nothing is uploaded. Results are for licensed clinicians only.
Worked calculation
The values below come from this tool's own example placeholders and are computed server-side with the formula shown on this page, so the arithmetic can be checked quickly. It demonstrates how to substitute values only — it is not clinical advice and not a real case.
| Age | 4 years |
|---|
→ETT internal diameteruncuffed 5 / cuffed 4.5 mm
- Uncuffed ID：5 mm (age/4 + 4)
- Cuffed ID：4.5 mm (age/4 + 3.5; some use +3, adjust by brand/clinical)
- Insertion depth：Lip ≈ ID × 3 = 15 cm; or age/2 + 12 = 14 cm
Common questions
What is Pediatric ETT Size & Depth?
Estimate pediatric endotracheal tube size and insertion depth by age.
How is Pediatric ETT Size & Depth calculated? What is the core formula?
Uncuffed ID = age/4 + 4; cuffed = age/4 + 3.5 (mm). Depth ≈ ID × 3 (cm) or age/2 + 12. Infants < 1 y by weight.
When is Pediatric ETT Size & Depth used?
Quick airway preparation for pediatric intubation.
What are the key clinical points for Pediatric ETT Size & Depth?
Keep ± 0.5 sizes available. Confirm position with end-tidal CO₂, auscultation and chest radiograph. Infants are sized by weight, not the age formula.
What are the limits and cautions when using Pediatric ETT Size & Depth?
For licensed clinicians and clinical researchers. Interpret results with history, investigations and local protocols; not a diagnosis or prescription, and not a substitute for multidisciplinary decision-making or local guidelines.
How is Pediatric ETT Size & Depth calculated in practice? Can you show a worked example?
Inputs: Age 4 years → Result: ETT internal diameter uncuffed 5 / cuffed 4.5 mm（Uncuffed ID: 5 mm (age/4 + 4), Cuffed ID: 4.5 mm (age/4 + 3.5; some use +3, adjust by brand/clinical), Insertion depth: Lip ≈ ID × 3 = 15 cm; or age/2 + 12 = 14 cm）
Run Pediatric ETT Size & Depth now
Estimate pediatric endotracheal tube size and insertion depth by age.
Open guideline tool →For licensed clinicians. Not a substitute for clinical judgement.
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