BMI Calculator for Teens
Estimate BMI for teenagers (ages 13–19) with simplified categories. Adolescent BMI is best interpreted on CDC growth-percentile charts.
What is BMI for Teens?
Teenagers' bodies change rapidly through puberty. Lean mass, fat distribution and bone density shift over months, which means the same BMI can mean very different things at 13 vs 19. Pediatricians compare a teen's BMI against age- and sex-specific percentile curves rather than absolute cut-offs.
How is it calculated?
Calculator computes BMI = weight (kg) / height (m)² and applies a simplified screening band. For diagnostic decisions, share the BMI with a clinician who can plot it on the CDC growth chart for the teen's exact age and sex.
Frequently Asked Questions
- Why are adolescent BMI percentiles age-specific?
- Body composition changes dramatically through puberty.
- Is dieting safe for teens?
- Diets that restrict calories should be guided by a clinician — energy demands are high during growth.
- Should I worry about a single high reading?
- Trends over months matter more than any single measurement.