How to calculate bmi? Ultimate Guide

How to calculate bmi

How to calculate bmi?


Body mass index:

How to calculate bmi , Body Mass Index (BMI) is one of the assessments to determine the level of obesity, where weight and height are used to find out whether the weight is healthy or not, and it should be noted that this evaluation is often related to total body fat mass; It is more an indicator than a measure of the total level of fat mass in the body, and its height most often indicates an increase in the percentage of total body fat.

It is worth noting that the basis for determining BMI values ​​is the extent of the effect of excess fat on disease and risk of death, so its height indicates a high risk of developing it, and among the health conditions that are associated with being overweight or obese: premature death, cardiovascular disease, High blood pressure, degenerative arthritis, diabetes, and some types of cancer, and it is worth noting that the BMI is recommended for children and adolescents as well, as it is measured for them as it is measured for adults, and then the result is compared with the percentile; It is the value of a variable that includes under it a certain percentage of the readings, which we will mention later.

Calculate BMI:

The body mass index can be calculated by dividing the body weight in kilograms by the square of its height in meters, and the equation in metric units is as follows:
BMI = weight (in kilograms) ÷ (height (meters)) ²
For example, if a person’s weight equals 70 kilograms, and his height equals 1.75 meters, then his body mass index is calculated as follows:
BMI = 70 kg ÷ (1.75 m) ² = 22.9 kg / m




Semantics of BMI results:

The result of the BMI calculation indicates the proportions of the weight to the height; Where this indicator determines if a person is underweight, or if he possesses a healthy weight or is overweight, or suffers from obesity, and therefore if the body mass index is outside the range of the ideal weight index, then the health of the body is more at risk, and it may expose the owner to many Among the health problems that we mentioned earlier, it should be noted that the body mass index is used to express the different weights for both sexes from the age of 20 years and over, and in what follows a table showing the values ​​of the body mass index, the classification of weight, and the interpretation of these values:

Body mass index (kg / m²):

  • Less than 18.5Weight rating: Being underweight or thin  , The weight is less than normal, and it may need to be increased to reach a normal weight, and a nutritionist should be consulted.


  • Between 18.5–24.9Weight rating: healthy , The weight is appropriate for height, and is less likely to have health problems.


  • Between 25.0–29.9Weight rating: overweight , He may need to lose excess weight for health reasons, and a nutritionist should be consulted.


  • 30.0 or more :  Weight rating: Obesity , Excessive weight gain, and health may be at risk if weight is not lost, and a nutritionist should be consulted.


How to calculate bmi


Children’s BMI:

Although the BMI equation is the same for adults and children, its interpretation differs between children and adolescents according to their ages and genders, due to the difference in the distribution of fats in their bodies. The value is the result of the body mass index of the child or adolescent with his peers of the same sex on the growth chart, for example, a child suffers from obesity if his body mass index is 95 percent or more on the growth chart, and the interpretation of this is that the child has a fat percentage of more than 95% of his peers of sex and age The following table shows the values ​​used to determine the BMI for children and adolescents, and to classify them:

Body mass index (kg / m²):

  • Less than %5Weight rating: Weight loss


  • 5% to less than 85% Weight rating: Normal weight


  • 85% to less than 95% :  Weight rating: overweight


  • 95% or moreWeight rating: Obesity




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