body mass index

Body Mass Index - what does it mean?

Body Mass Index (BMI) is a numerical value that provides an indication of a person's weight status in relation to their height. It is commonly used as a simple and quick assessment tool to categorize individuals into different weight categories, such as underweight, normal weight, overweight, and obesity. BMI is calculated by dividing a person's weight in kilograms by the square of their height in meters (kg/m²).

The formula for calculating BMI is: BMI=weight (kg)height (m)2

Here are the BMI categories and their corresponding ranges:

  • Underweight: BMI less than 18.5
  • Normal Weight: BMI 18.5 to 24.9
  • Overweight: BMI 25 to 29.9
  • Obesity Class I: BMI 30 to 34.9
  • Obesity Class II: BMI 35 to 39.9
  • Obesity Class III (Morbid Obesity): BMI 40 or higher

It's important to note that while BMI is a widely used tool for assessing weight status, it has some limitations:

  1. Doesn't Account for Muscle Mass: BMI doesn't differentiate between lean body mass (muscle) and fat mass. As a result, individuals with high muscle mass may have a higher BMI even if they have a healthy body composition.

  2. Doesn't Consider Body Composition: People with the same BMI can have different body compositions, which can impact their health risks. For example, visceral fat (fat around internal organs) is associated with higher health risks compared to subcutaneous fat (under the skin).

  3. Doesn't Account for Age and Gender: BMI values may need to be interpreted differently for different age groups and genders.

  4. May Not Apply to All Populations: BMI was initially developed for adults and may not accurately assess weight status in children, elderly individuals, athletes, or certain ethnic groups.

  5. Health Risks: While BMI can provide an indication of weight-related health risks, other factors such as genetics, lifestyle, and overall health also play a significant role.

BMI can be a useful initial assessment tool, but it's important to consider it alongside other health indicators and consult with a healthcare professional, such as a doctor or registered dietitian, for a more comprehensive evaluation of your health and weight status.


Calculate your BMI here.

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