Paediatric Calculations

ETT size (uncuffed) = ( age / ) +
ETT size (cuffed) = ETT size (uncuffed) –

ETT depth (oral) = ( age / ) +

LMA #1 – < kg

LMA #1.5 – < kg

LMA #2 – < 20kg

LMA #2.5 – < kg

LMA #3 – – kg

LMA #4 – > kg

Weight (It’s very unlikely an exam question will ask you to calculate weight – too much controversy)

• <1y = ( age x ) +
• 1-5y = ( age x ) +
• 5-12y = ( age x ) +

Energy = J / kg

Tube size (uncuffed) = ( age / ) +

Fluid bolus = mL / kg

Lorazepam / midazolam = – mL / kg   IV/IM/IO

Adrenaline = mcg / kg OR mL / kg of 1: Adrenaline

Glucose (10%) = – mL / kg IV

Amiodarone = mL / kg

Aminophylline = mL / kg loading dose