BMI Calculator

What is BMI?

Body Mass Index (BMI) is a simple calculation using a person's height and weight. It is an inexpensive and easy screening method for weight categories—underweight, healthy weight, overweight, and obesity.

How to Calculate BMI

The formula for BMI is:

  • Metric Units: BMI = weight (kg) / (height (m) * height (m))
  • Imperial Units: BMI = (weight (lbs) / (height (in) * height (in))) * 703

BMI Categories

The World Health Organization (WHO) defines the BMI categories as follows:

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

Why is BMI Important?

BMI is a useful measurement for most people over 18 years old. It can help identify individuals who are at an increased risk for health problems due to their weight. However, it is important to note that BMI is a screening tool and not a diagnostic measure.

Limitations of BMI

While BMI is a useful general guideline, it has some limitations:

  • Age: It may not accurately reflect body fat percentage in older adults, who may have lost muscle.
  • Gender: Women generally have more body fat than men for the same BMI.
  • Muscle Mass: It may overestimate body fat in athletes and others with a muscular build.
  • Ethnicity: Different ethnic groups can have different associations between BMI, body fat, and health risks.

How to Use the BMI Calculator

  1. Enter your weight in either kilograms (kg) or pounds (lbs).
  2. Enter your height in either centimeters (cm) or inches (in).
  3. Click the "Calculate" button to get your BMI.

Try the BMI Calculator

Metric Units

  • Weight (kg): [Input Box]
  • Height (cm): [Input Box]
  • [Calculate Button]

Imperial Units

  • Weight (lbs): [Input Box]
  • Height (in): [Input Box]
  • [Calculate Button]

Your BMI Result

  • Your BMI is: [Result]
  • Category: [Underweight / Normal weight / Overweight / Obesity]

What to Do Next?

If your BMI is outside the normal range, consider talking to a healthcare provider. They can help you understand the risks associated with your BMI and develop a plan to achieve a healthier weight.

Additional Resources

  • [Healthy Eating Guidelines]
  • [Exercise Recommendations]
  • [Health Risks of Overweight and Obesity]