Calculadora de IMC para Crianças
- Created by
- Renato Passos, Eng. de Software
- Reviewed by
- Renato Passos, Eng. de Software
Last updated: Apr 18, 2026
Formula
IMC = peso / altura²
About this calculator
This child BMI calculator computes the body mass index (BMI) based on weight and height. BMI is calculated by dividing weight (in kg) by height (in meters) squared. For children and adolescents aged 2 to 19, the raw BMI is not interpreted alone; it must be compared against WHO percentile curves that account for age and sex. This comparison indicates whether the child is underweight, healthy weight, overweight, or obese.
Use this calculator to get your child's BMI numeric value. Then check the WHO percentile tables specific for your child's age and sex. For example, a BMI above the 85th percentile indicates overweight, and above the 95th percentile, obesity. Remember that child BMI is a screening tool, not a definitive diagnosis. Consult a pediatrician for a full assessment, including growth history, eating habits, and physical activity.
Important precautions: do not use adult BMI cutoffs for children, as the thresholds differ. Also, BMI does not distinguish fat mass from lean mass, so athletes or very muscular children may have high BMI without excess fat. Always interpret results with a healthcare professional, considering the child's individual context.
Frequently asked questions
What is the difference between child and adult BMI?
For children, the BMI value is compared against age- and sex-specific percentile curves, while adults use fixed ranges (e.g., 25-29.9 overweight).
Is child BMI accurate for diagnosing obesity?
No, BMI is a screening tool. Diagnosis should be made by a pediatrician with clinical and body composition assessment.
What should I do if my child's BMI is above the 95th percentile?
Consult a pediatrician. They may recommend dietary changes, physical activity, and possibly a referral to a nutritionist.
My child is very active and has a high BMI. Should I worry?
It could be due to muscle mass. The pediatrician will evaluate the percentile and other factors to determine if there is excess fat.
Can I use this calculator for babies under 2 years old?
No. For children under 2, use the WHO growth charts specific for weight-for-length.