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Method for paediatric (child) weight estimation

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An Australian study derived three simplified linear equations to calculate mean weight for age.

For Infants < 12 months: Weight (kg) = (age in months + 9)/2

For Children aged 1-5 years: Weight (kg) = 2 x (age in years + 5)

For Children aged 5-14 years: Weight (kg) = 4 x age in years

Reference:

  1. Tinning K, Acworth J. Make your Best Guess: an updated method for paediatric weight estimation in emergencies. Emerg Med Australas. 2007 Dec;19(6):528-34

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