**Calculate the BMI (body mass index)** or in Italian** BMI (body mass index)** it is useful to get an idea of how close we are to our ideal weight. The BMI is calculated by dividing your weight in kg by the square of your height expressed in meters.

For **calculate your BMI** in a few seconds you can use our online calculator, by entering your height in cm below (eg if you are 1.86 tall you must enter 186) and your weight in kg (eg if you weigh 72.5 kg you must enter 72.5).

Now that you've got the **calculation of the BMI** you can get an idea of how close you are to your ideal weight by consulting the following table, approved by the World Health Organization (WHO), and identifying the category to which you belong based on the range in which your BMI is.

In my case, for example, being 1.86 meters tall and weighing 73.5 kg, I have a BMI of 21.2 which falls into the “Regular (ideal weight)” category.

However, it is important to point out that the BMI only offers a "spannometric" indication as the real weight of each of us is determined by multiple additional factors, including:

- Age
- Sex
- Percentage of fat mass and lean mass

The US National Institutes of Health and the Center for Disease Control and Prevention have also agreed since 1998 on the limit value of a BMI equal to 25, identified as the starting point for indicating excessive weight, which lowered the previous limit of 27.8.

In relation to the percentage of fat mass the **BMI** it can be overestimated or underestimated. For example, in the case of individuals with extremely developed muscle mass (eg a bodybuilder) the BMI will tend to have a higher value.

On the contrary, the **BMI** of an elderly person, who has reduced muscle mass with age, will be underestimated.

In any case, the **BMI** remains a very important and reliable indicator, so much so that a study by the Prospective Studies Collaboration published in the authoritative Lancet journal has ascertained a correlation between BMI value and duration of life.

In the following graph it is thus possible to see how very low values of **BMI** (which can be associated with **malnutrition**) or very high values of **BMI**, associated with a fort **overweight**, are associated with a** lifespan up to 8 years shorter**, compared to those who have BMI values associated with a correct weight.

Other articles that may interest you:

- How to calculate the ideal weight

- How to calculate fat mass

- How to keep fit

- How to speed up the metabolism