This calculator gives an approximate BMI for children from ages 5 to 19. It will tell you if a child is underweight, at an ideal weight, at risk of being overweight, or is now overweight. A BMI of 17 may be perfectly healthy for a 7-year-old but indicate underweight for a 15-year-old. The WHO reference tables update the expected range every single month from birth to age 19, which is why accurate age entry is critical. This BMI percentile calculator uses CDC growth standards to calculate your child's BMI, compare it to peers of the same age and sex, and classify it into one of four categories. BMI-for-age (5-19 years) Interpretation of cut-offs Overweight: +1SD (equivalent to BMI 25 kg/m2 at 19 years) Obesity: +2SD (equivalent to BMI 30 kg/m2 at 19 years) Thinness: -2SD Severe thinness: -3SD 13-19 teen BMI calculator: Check CDC percentile, Z-score, charts and tracking. Useful guidance for athletes and special groups. This BMI calculator for teens is designed to help parents, caregivers, and adolescents better understand weight status during growth years. Enter age, gender, height, and weight above to calculate BMI percentiles and see how the result compares to healthy ranges for kids and teens. This calculator provides body mass index (BMI) and the corresponding BMI-for-age percentile based on CDC growth charts for children and teens ages 2 through 19 years. This calculator provides body mass index (BMI) and the corresponding BMI-for-age percentile based on CDC growth charts for children and teens ages 2 through 19 years. The result will give you the BMI value, which can then be used to determine the weight status category (underweight, normal weight, overweight, or obese) for teens. We will not only help you to calculate your BMI for teens quickly and painlessly, but we will also teach you how to read the BMI charts for teens and what you can do to achieve your ideal BMI.