BMI Calculator for Teens
Compute teen BMI, BMI prime, and percentile category using age and sex.
Teen BMI and Growth
Teenagers experience rapid growth and body composition changes, especially around puberty. That is why teen BMI must be interpreted with age and sex, not with adult cutoffs. This calculator supports ages 10 to 20. For adults, use the BMI Calculator.
Teen BMI Formula
$$\text{BMI} = \frac{\text{weight (kg)}}{(\text{height (m)})^2}$$
BMI prime compares teen BMI to the adult reference of 25. Percentile and WHO category remain the primary screening outputs for adolescents.
Percentile Categories for Teens
- Underweight: below 5th percentile
- Healthy weight: 5th to 85th percentile
- Overweight: 85th to 95th percentile
- Obese: above 95th percentile
Frequently Asked Questions
Why do boys and girls have different teen BMI ranges?
Puberty timing and body composition differ by sex, so reference medians and spreads are sex-specific.
Is teen BMI useful for athletes?
It can overestimate body fat in muscular teens. Use it as one screen, not the only health measure.
What BMI percentile is healthy for teens?
Most clinicians consider the 5th to 85th percentile range healthy, but growth trends should be reviewed over time.
Should teens try to reach BMI prime of 1?
No. BMI prime is based on adult reference values and is secondary for teens. Focus on percentile and overall health habits.
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