The situation is more complex in children, where the BMI threshold of obesity varies with age and sex. The charts below show how the BMI obesity threshold changes with age for boys and girls.

About every 6 months, return to this page to recalculate your child's BMI, BMI Percentile, and Energy needs. Update the chart with the new data. Individual results, when compared to other children, ...

BMI charts are calculated for adults only (separate charts are available for children’s weight and heights). Inaccuracies can also occur if you're an athlete or very muscular as this can give ...