The body mass index (BMI) calculator is a tool that calculates an individual's BMI based on their height and weight. BMI is a measure of body fat based on an individual's weight in relation to their height. It is used to assess whether a person is underweight, normal weight, overweight, or obese.

To use the BMI calculator, a person enters their weight in kilograms and their height in centimeters. The calculator then calculates their BMI and determines which BMI category they fall into based on the following ranges:

Underweight: BMI below 18.5

Normal weight: BMI between 18.5 and 24.9

Overweight: BMI between 25 and 29.9

Obese: BMI of 30 or higher

The BMI calculator is a useful tool for individuals who are looking to monitor their weight and overall health. However, it should be noted that BMI is not a perfect measure of body fatness and does not account for factors such as muscle mass or bone density. Therefore, it should be used in conjunction with other measures of health, such as waist circumference and blood pressure.