Child Weight Estimate Calculator
Estimate a healthy weight for a child from age using the standard emergency paediatric formula.
Recent
Formula
How the calculation works
The tool works out the age in years, adding months as a fraction of a year.
Below one year it uses a formula based on months, from one to five a simpler doubling, and from six to twelve three times the age plus seven.
The answer is an average for that age, not a prediction for one particular child.
Common mistakes
- Reading the average as a healthy target for your own child, whose growth curve matters more.
- Using it past twelve years, where the estimate no longer applies.
When to use it
- Use it as a rough check on a child's weight for their age.
- It is not a growth assessment; a paediatrician uses charts, not a single formula.
Worked example
A child of 8 years is estimated at 3 times 8 plus 7, which is 31 kg.
Common questions
Which formula is used?
It uses the standard Advanced Paediatric Life Support weight formula, the same one used to prepare emergency drug doses.
Is this the child's real weight?
No, it is a population estimate for a healthy child of that age, so a real scale measurement is always better.
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