Calculate BMI based on age, sex, height, and weight using child growth percentiles.
BMI in children is a tool that helps estimate a child’s growth and nutritional status compared with other children of the same age.
In children, BMI is not interpreted the same way it is in adults. It is assessed according to age and sex, and is usually shown using percentiles to reflect normal growth and development more accurately.
May suggest low intake, feeding challenges, or a need to look more closely at growth patterns.
A range that is generally considered appropriate and healthy for growth.
A result that deserves attention and may be worth discussing with a qualified pediatric dietitian.
A result that usually requires professional follow-up and a broader look at health, growth, and habits.
Important: This check is not a medical diagnosis and does not replace a full assessment by a pediatric dietitian or healthcare professional.
As parents, it is completely natural to want to know whether your child is growing and developing as expected. A BMI calculator can give you a general picture of the relationship between height and weight as part of routine growth follow-up.
In children, BMI is interpreted according to age and sex and is evaluated through percentiles. This makes it possible to understand where a child falls compared with peers of the same age, instead of relying on a single number alone.
A result outside the usual range does not always mean there is a problem, but it can be a useful sign that closer follow-up or guidance may be helpful.
Every child develops at a different pace. The goal is not comparison — it is understanding the child’s own growth picture over time.
This calculator provides general information only and does not replace personal medical or nutrition advice. If you have any concerns, it is a good idea to speak with a qualified professional in child nutrition.
A child’s BMI depends on both age and sex. Our calculator combines all the relevant information and gives you a clearer picture based on World Health Organization (WHO) growth charts.
Here is how to use it in 3 simple steps:
Choose your child’s sex and enter the exact age in years and months. Accuracy matters, because in children the expected ranges can change from month to month.
Enter height in centimeters and weight in kilograms. For the most accurate result, it is best to measure your child without shoes and in light clothing.
After clicking “Calculate,” you will see the calculated BMI and your child’s position on the scale for age and sex.
What if the result is outside the usual range? Do not panic. A calculator is only a first screening tool. If the result shows a possible concern, you can use it as a starting point for a closer look and, when needed, professional guidance.
A quick check of BMI based on age and sex
BMI (Body Mass Index) is a calculation that combines weight and height. In children, unlike adults, the result is interpreted according to age and sex and is shown using percentiles, helping reflect normal growth and development.
BMI is a useful screening tool, but it is not a diagnostic measure. It can help identify growth patterns, but it should always be interpreted in a broader context that includes development, nutrition, and lifestyle.
A result outside the usual range does not necessarily mean there is a problem. Sometimes it reflects a temporary stage of development, but in some cases it may be helpful to monitor trends over time or consult a qualified professional.
No. This calculator is intended for general information only and does not replace personal medical or nutrition advice. If you have any questions or concerns, it is recommended to speak with a qualified professional in child nutrition or health.
In most cases, checking every few months is enough, or as part of a routine health visit. There is usually no need to measure too often — it is more important to follow the trend over time.
Growth tracking, charts for babies and preterm infants, BMI, readiness for solid foods, baby stool color checks, and more — all in one place to help you quickly understand your child’s development with confidence.
