Body Mass Index (BMI) is a tool that provides an estimation of an individual’s body fat based on their weight and height. It is commonly used to categorize an individual’s weight status and potential health risks related to body weight.

Here’s how to calculate BMI:


$$ BMI = \frac{weight , (kg)}{height^2 , (m^2)} $$


  1. Measure your weight in kilograms (kg):

    • Use a reliable scale and measure your weight without wearing heavy clothing.
  2. Measure your height in meters (m):

    • Stand against a flat wall and mark the top of your head. Then, measure the height from the floor to the mark.
  3. Plug your measurements into the formula:

    • Square your height (multiply it by itself).
    • Divide your weight by the squared height value.

The result is your BMI.

Categories based on BMI:

  • Underweight: BMI is less than 18.5
  • Normal weight: BMI is 18.5 to 24.9
  • Overweight: BMI is 25 to 29.9
  • Obesity: BMI is 30 or greater

It’s essential to understand that BMI is a screening tool and not a diagnostic tool. While it can indicate whether a person has excess body fat, it doesn’t measure body fat directly. Factors like muscle mass, bone density, and overall body composition can influence BMI. Always consult with a healthcare professional for a comprehensive understanding of your health.