| Age | Weight | ET tube | Blade |
| < 28 weeks | <1000 g | 2 to 2.5 | 0 Miller |
| 28-34 weeks | 1000-2000 g | 2.5 - 3 | 0 Miller |
| 34-38 weeks | 2000 - 3000 g | 3 - 3.5 | 0 Miller |
| term | > 3000 g | 3.5 - 4 | 1 Miller |
| 3 mo | 5.5 kg | 4 | 1 Miller |
| 6 mo | 7 | 4 | 1 Miller |
| 1 yr | 10 | 4.5 | 1 Miller |
| 2 yr | 12 | 4.5 | 1.5 Miller |
| 3 | 14 | 5 | 2 Miller/Mac |
| 4 | 16 | 5.5 | 2 Miller/Mac |
| 5 | 18 | 5.5 | 2 Miller/Mac |
| 6-7 | 20-22 | 6 | 2 Miller/Mac |
| 8-10 | 25-30 | 6.5 | 2 Miller/Mac |
| Adult Female | 60 | 7 | |
| Adult Male | 70 | 8 |
Estimation of ET inner diameter (millimeters) = 4 + age/4
Use uncuffed tube under 8 years of age.
Subtract 0.5 from size for cuff.
ET tube depth of insertion (gum line) = 3 x (internal diameter)
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