IMC classificação
- Created by
- Renato Passos, Eng. de Software
- Reviewed by
- Renato Passos, Eng. de Software
Last updated: Apr 18, 2026
About this calculator
The BMI Classification Calculator uses the Body Mass Index (BMI) to categorize a person's weight based on their mass and height. The BMI is calculated by dividing the weight in kilograms by the square of the height in meters. This value is then compared to the categories established by the World Health Organization (WHO) to determine if the weight is underweight, normal weight, overweight, or obese.
The WHO-defined BMI categories are as follows: below 18.5 is considered underweight; between 18.5 and 24.9 is considered normal weight; between 25 and 29.9 is considered overweight; and 30 or more is considered obese. Note that BMI does not take into account body composition, such as the proportion of muscle mass and body fat.
BMI is a useful tool for assessing the risk of weight-related diseases, such as diabetes, heart disease, and certain types of cancer. However, it is essential to remember that BMI is only an estimate and may not be accurate for everyone, such as athletes with high muscle mass or individuals with osteoporosis.
It is recommended to use BMI in conjunction with other health assessments to obtain a more comprehensive view of a person's health status. Additionally, it is crucial to consult a healthcare professional for personalized guidance on weight and overall health.
Frequently asked questions
What is BMI and how is it calculated?
BMI is the Body Mass Index, calculated by dividing weight in kilograms by the square of height in meters.
What are the WHO-defined BMI categories?
The categories are: underweight (<18.5), normal weight (18.5-24.9), overweight (25-29.9), and obese (≥30).
Is BMI an accurate measure of health?
BMI is an estimate and may not be accurate for everyone, such as athletes or individuals with osteoporosis.
How can I use BMI to improve my health?
Use BMI as a tool to assess your risk of weight-related diseases and consult a healthcare professional for personalized guidance.
What are the risks of having a high or low BMI?
A high BMI is linked to diseases like diabetes, heart disease, and certain types of cancer, while a low BMI may indicate malnutrition or other health issues.