This site is intended for healthcare professionals

Sign in
Go to /sign-in page

You can view 5 more pages before signing in

Method for paediatric (child) weight estimation

Authoring team

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

Create an account to add page annotations

Create a free account

Add information to this page that would be handy to have on hand during a consultation, such as a web address or phone number. This information will always be displayed when you visit this page

The content herein is provided for informational purposes and does not replace the need to apply professional clinical judgement when diagnosing or treating any medical condition. A licensed medical practitioner should be consulted for diagnosis and treatment of any and all medical conditions.

Connect

Copyright 2025 Oxbridge Solutions Limited, a subsidiary of OmniaMed Communications Limited. All rights reserved. Any distribution or duplication of the information contained herein is strictly prohibited. Oxbridge Solutions receives funding from advertising but maintains editorial independence.