Body Mass Index Calculator

Enter your Height and Weight into the calculator. Click to calculate and the calculator will calculate your BMI.

Description Value
Calculated Result
Underweight < 18.5
Normal 18.5 - 24.9
Overweight 25 - 29.9
Obesity >30

Health Disclaimer

This tool provides informational content, not medical advice. Consult a professional for health issues.


This tool was developed using data and information from the following sources:

Last Update:

What is the body mass index (BMI)?

Body Mass Index (BMI) is a method calculated based on a person's weight and height. It serves as a simple, standardized method to assess whether a person's weight is within a healthy range for their height. The formula to calculate BMI is:

BMI = (Weight in kilograms) / (Height in meters)^2

The resulting BMI value is then compared to established BMI categories to determine a person's weight status:

  • Underweight: BMI < 18.5
  • Normal weight: 18.5 ≤ BMI < 24.9
  • Overweight: 25 ≤ BMI < 29.9
  • Obesity (Class I): 30 ≤ BMI < 34.9
  • Obesity (Class II): 35 ≤ BMI < 39.9
  • Obesity (Class III): BMI ≥ 40

Although BMI is a widely used tool, it is important to remember that it has limitations. Factors such as muscle mass, bone density and body fat distribution are not taken into account. This means that people with more muscle mass may have a higher BMI even if they are not obese in terms of body fat. Similarly, some people with a healthy BMI may have a higher proportion of visceral fat (fat around organs), which can pose health risks.

BMI should be used as a screening tool, not as a definitive diagnosis. Other health assessments such as waist circumference, body composition analysis and general health assessment should be considered for a more comprehensive picture of an individual's health status.

What are the consequences of high BMI?

People with a high body mass index (BMI), especially those in the overweight and obese categories, may be at increased risk of various health problems. It's important to note that BMI is just an indicator and does not take into account factors such as muscle mass, genetics, or other health indicators. However, a high BMI can be associated with several health problems, including:


It is important to understand that the relationship between BMI and health is complex and individual factors can play an important role. Lifestyle factors such as diet, physical activity, genetics and general health status also contribute to the development of these health problems. If you are concerned about your BMI and potential health risks, it is important to consult a health professional.

What are the consequences of low BMI?

Having a low Body Mass Index (BMI), especially when it falls below the normal weight range, can lead to some health problems. It is important to note that a low BMI may be indicative of poor nutrition, underlying health problems or a combination of factors.

Some potential health associated with a low BMI are listed below:

  • Malnutrition
  • Osteoporosis
  • Weak Immune System
  • Anemia
  • Reproductive Issues
  • Muscle Wasting
  • Heart Problems
  • Reduced Energy Levels
  • Cognitive Impairment
  • Hormonal Imbalances
  • Delayed Growth and Development
  • Decreased Fertility
  • Depression and Anxiety


It's important to approach a low BMI with care and consideration. If you or someone you know is experiencing a low BMI and related health problems, it's recommended to seek medical attention. A healthcare professional can help identify the underlying causes and develop a plan to improve nutritional intake and overall health.

Click Here for CDC Data Table of BMI Charts by Age


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