Nasal ETT Insertion Depth for Children

Insertion Length (nasal) · Equipment

Notes

Insertion length (nasal) = Insertion length (oral) +20 %

Insertion Length (nasal): value for each weight
Weight	Age (estimate)	Value
2 kg	preterm	9.5 centimeters
3 kg	newborn	11 centimeters
4 kg	1 mo	11.5 centimeters
5 kg	2 mo	12 centimeters
6 kg	4 mo	12.5 centimeters
7 kg	6 mo	13 centimeters
8 kg	8 mo	13.5 centimeters
9 kg	10 mo	14.5 centimeters
10 kg	1 y	15 centimeters
11 kg	1 y 6 mo	15 centimeters
12 kg	2 y	15.5 centimeters
13 kg	2 y 4 mo	15.5 centimeters
14 kg	2 y 8 mo	15.5 centimeters
15 kg	3 y	16 centimeters
16 kg	3 y 6 mo	16 centimeters
17 kg	4 y	17 centimeters
18 kg	4 y 6 mo	17 centimeters
19 kg	5 y	17.5 centimeters
20 kg	5 y 6 mo	17.5 centimeters
21 kg	6 y	18 centimeters
22 kg	6 y 4 mo	18 centimeters
23 kg	6 y 8 mo	18 centimeters
24 kg	7 y	18.5 centimeters
25 kg	7 y 4 mo	18.5 centimeters
26 kg	7 y 8 mo	18.5 centimeters
27 kg	8 y	19 centimeters
28 kg	8 y 4 mo	19 centimeters
29 kg	8 y 8 mo	19 centimeters
30 kg	9 y	20 centimeters
31 kg	9 y 4 mo	20 centimeters
32 kg	9 y 8 mo	20 centimeters
33 kg	10 y	20.5 centimeters
34 kg	10 y 3 mo	20.5 centimeters
35 kg	10 y 6 mo	20.5 centimeters
36 kg	10 y 9 mo	20.5 centimeters
37 kg	11 y	21 centimeters
38 kg	11 y 4 mo	21 centimeters
39 kg	11 y 8 mo	21 centimeters
40 kg	12 y	21.5 centimeters

Open the calculator Report a problem with this value

Values imported unchanged on 2026-11-04. Independent verification against official sources is in progress (see Methodology).

Last updated: 2026-11-04