Use this calculator to determine whether a child is at a healthy weight for his/her height, age and sex. The BMI-percentile-for-age calculator automatically adjusts for differences in height, age and ...

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.

Even medical professionals use BMI to assess health risks associated with obesity, excess or low weight. This calculator computes your body mass index based on your gender, age, height and weight.