BMI Body Mass Index Calculator (for Children) - Ideal Weight Calculator for Children

The BMI (Body Mass Index) calculator for children is a tool used to assess whether a child's weight is appropriate for their height, i.e., the ideal weight (BMI) for your child. This calculator uses BMI categories used for children aged 2 to 20 years. The calculator takes into account age, gender, height, and weight to calculate the child's BMI. The child's BMI is presented as a percentage (centile), and the percentage indicates how the child's weight compares to other children of the same age and gender.

BMI (Body Mass Index) for Children

Height

Weight

Age(between 2 and 20 years)

Gender

Male

Female

Centile Range	Weight Status Category
Less than 5%	Underweight
5% to 85%	Healthy weight
85% to 95%	At risk of overweight
Greater than or equal to 95%	Overweight
Source: Centers for Disease Control and Prevention - National Center for Health Statistics
Last Reviewed Date: 28/02/2026

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Calculate Body Mass Index BMI (Children) - Ideal Weight for Child

Calculate Body Mass Index BMI (Children) - Accurately Measure Your Child's Health and Weight

The child's Body Mass Index (BMI) tells us whether their weight is appropriate for their height. Instead of using BMI categories used for adults, BMI for children is given as a percentile. Since children continue to grow until around age 20, their age and whether they are a boy or girl are also used to calculate the BMI percentile.

For children and adolescents aged 2 to 20, the BMI calculator takes into account age, gender, as well as height and weight.

The child's BMI is given as a "centile." The centile number indicates how the BMI compares with other children of the same age and gender as a percentage.

For example, a girl in the seventy-fifth (75th) percentile means she is heavier than 75% of other girls of the same age.

In this calculator, we used the BMI categories for children and adolescents aged 2 to 20, recommended by the "Centers for Disease Control and Prevention (CDC)" of the United States National Public Health Agency, as mentioned in the previous table.

BMI Growth Charts for Children and Adolescents, Ages 2 to 20:

Growth percentiles charts from the Centers for Disease Control and Prevention (CDC):

Table of Data for BMI Charts for Age Used in this Calculator to Calculate Percentile:

These percentiles represent the child's BMI compared to American children who participated in national surveys from 1963-1965 to 1988-1994. We did not find BMI charts for children in Arab countries, so we relied on American data.

Source:Centers for Disease Control and Prevention - United States National Public Health Agency
Last Reviewed:07/06/2023