Calculadora de IMC Infantil (0-19 anos)
- 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
The Child BMI Calculator (0-19 years) calculates the raw Body Mass Index (BMI) of a child or adolescent using the formula BMI = weight (kg) / height² (m²). The result alone does not classify nutritional status, as reference values vary by age and sex. This tool is useful for parents, caregivers, and health professionals who need to quickly obtain BMI before consulting WHO percentile curves.
To use the calculator, enter weight in kilograms and height in meters. The system provides BMI with two decimal places. Remember that child BMI must be interpreted using growth charts or percentile tables specific to age and sex, since growing children have different body composition than adults. This calculator does not replace evaluation by a pediatrician or nutritionist.
When to use: routine check-ups, growth monitoring, screening for overweight or obesity, and monitoring children with conditions affecting weight. It is also useful for professionals who need to calculate BMI for multiple patients quickly. Caution: do not use BMI alone to diagnose undernutrition or obesity; always compare with WHO percentiles. Also, BMI does not differentiate fat mass from lean mass, which may overestimate fat in very muscular children.
Frequently asked questions
Does the child BMI result already indicate if the child is overweight?
No. The raw BMI must be compared with WHO percentile curves for age and sex. Only then can nutritional status be classified.
What is the difference between child BMI and adult BMI?
In adults, cutoffs are fixed (e.g., above 25 is overweight). In children, values change with age and sex, so percentiles are used.
Can I use this calculator for babies under 2 years?
Yes, the calculator works for ages 0 to 19. For infants, WHO recommends using BMI-for-age charts, but the BMI calculation is the same.
What should I do if the child's BMI is above the 85th percentile?
Consult a pediatrician or nutritionist. The 85th percentile indicates overweight, and the 95th obesity. A professional will perform a complete evaluation.
Does the calculator work for children with disabilities or special conditions?
The BMI calculation is valid, but interpretation should consider specific conditions affecting weight and height. Consult a specialist.