Teen BMI Calculator

Calculate BMI, BMI Prime, and CDC BMI-for-age percentile for ages 2–19.People age 20 and older should use adult BMI interpretation.

Inputs

Height

On height unit change, the height input resets to 0 for a fresh entry.

Weight

Use the teen’s current body weight.

Age

Years

Months

Percentile requires age from 2 to 19 years. Months are optional.

Sex

Sex is needed for CDC BMI-for-age percentile lookup.

Precaution: Teen BMI percentile is a screening estimate, not a medical diagnosis. For health concerns, use this result with guidance from a qualified healthcare professional.

Use this Teen BMI Calculator to calculate BMI and estimate BMI-for-age percentile for children and teens. Unlike adult BMI, results for young people should be interpreted according to age and sex.

Calculation Method

BMI = weight (kg) ÷ height (m)²

For pounds and inches:

BMI = 703 × weight (lb) ÷ height (in)²

The calculated BMI is then compared with CDC BMI-for-age reference data for the same age and sex.

CDC screening categories for ages 2 through 19 are:

Underweight: below the 5th percentile
Healthy weight: 5th to below the 85th percentile
Overweight: 85th to below the 95th percentile
Obesity: 95th percentile or higher

Example

For a teen weighing 55 kg and measuring 1.65 m:

BMI = 55 ÷ 1.65²

BMI ≈ 20.2

The calculator then compares this BMI with the appropriate age- and sex-specific CDC reference curve to estimate the percentile and category.

Important Note

Teen BMI is a screening measure, not a diagnosis. It does not directly measure body fat and should be considered together with growth pattern, puberty, medical history, nutrition, and other health information.

CDC child and teen BMI percentiles apply to ages 2 through 19. People age 20 and older should use adult BMI interpretation.

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