Child BMI Calculator
Calculate a child's BMI value, with the reminder that interpretation needs an age and sex chart.
Quick answer: enter your details below and click Calculate Child BMI — your result appears instantly, right here in your browser. Nothing you enter is uploaded or stored.
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Enter your details below.
How to use
- Enter the child's weight and height.
- Enter age and sex for the chart reminder.
- Click Calculate Child BMI.
About this tool
The BMI maths is the same as for adults — weight divided by height squared — but the meaning is not. For children, the value must be plotted on an age- and sex-specific chart. This tool gives the number and the chart reminder, and it is not medical advice — check with a clinician for interpretation.
Frequently asked questions
What chart should I use?
The growth chart used by your country's health service for the child's age and sex.
Is this medical advice?
No. It calculates a number; interpretation belongs to a clinician.