Enter your child's age, weight, and length/height — this calculator computes BMI (kg/m²) and looks up its percentile on the official WHO Child Growth Standards reference. Under 2 years uses recumbent length; 2 years and older uses standing height, matching WHO's own convention. Calculated entirely in your browser — nothing is uploaded or stored.
Please enter a valid date of birth (child must be 0–5 years old), weight, and length/height.
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⚠ Educational tool, not medical advice. This calculator uses the WHO Child Growth Standards (2006), which cover ages 0–5. For children over 5, WHO's separate 2007 growth reference applies — a lower-authority dataset built from older reference data rather than a fresh study, and not yet included in this tool. A single reading outside the typical range is not a diagnosis — growth trend over multiple visits matters more than one measurement. Always discuss your child's growth with a qualified pediatrician.