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Calcimator

Pediatric BMI Calculator

Calculate BMI-for-age percentile and weight category for children ages 2-20 years.

Inputs

months
lb
in

Results

BMI

14.8

Percentile

18.8%ile

CategoryNormal Weight
Healthy Weight Range20.6 - 25.7 kg
How to Use This Calculator
  1. Enter the child's Age in months (24–240 months, i.e., 2–20 years) — BMI-for-age is only valid for children 2 and older.
  2. Enter the child's Weight in kg and standing Height in cm from the most recent clinical measurement.
  3. Select Sex (1 = Male, 2 = Female) — BMI percentile norms differ significantly by sex and age.
  4. Review the calculated BMI, age-sex-adjusted Percentile, and weight Category (Underweight / Normal / Overweight / Obese).
  5. Check the Healthy Weight Range (in kg) corresponding to the 5th–85th BMI percentile for this child's age, sex, and height.

How the result changes with Height

HeightBMIPercentile
7440.299.9%ile
10918.597.5%ile
1519.60.1%ile
1866.40.1%ile

What each input means

Age
Child's age in months (24-240; BMI-for-age is valid for ages 2-20 years).
Weight
Current weight in kilograms.
Height
Standing height in centimeters.
Sex
1 = Male, 2 = Female — BMI percentile norms differ by sex.

How this is calculated

Worked example, using the default values

  1. Identify Input Parameters
    4 parameters
    Age = 84, Weight = 22, Height = 122, Sex = 1 = 4 input(s) provided
  2. Calculate BMI
    BMI
    14.8 = 14.8
  3. Calculate Percentile
    Percentile
    18.8 = 18.8
  4. Calculate Category
    Category
    Normal Weight = Normal Weight

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