Teen BMI Calculator

For teens aged 13 to 19. Everything runs locally in your browser.

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BMI
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Teen BMI should be interpreted using CDC growth chart percentiles for age and sex, not fixed cutoffs. A number alone does not indicate health status. This result is for general reference only and is not a medical assessment. Please consult a healthcare professional for guidance.

100% client-side. Your data never leaves this browser.

About Teen BMI

Teen BMI is a screening measure calculated from height and weight, but it is not interpreted like adult BMI. During adolescence, bodies grow and change rapidly, so a teen’s BMI must be assessed against age- and sex-specific growth charts. The CDC uses percentiles to account for normal developmental differences between 13- and 19-year-olds. A BMI that is healthy at one age or for one sex may fall outside the expected range at another, which is why a single fixed cutoff is misleading. This calculator provides a preliminary BMI number for general reference, but teens and parents should consult a healthcare professional or CDC growth charts for a full percentile assessment.

Calculating teen BMI locally in your browser is safer for sensitive health data. Unlike server-based tools that may log or store height, weight, age, and sex, this calculator runs 100% client-side. Nothing is uploaded, transmitted, or shared, so personal measurements stay on your own device.