Body Mass Index (BMI) Calculator

Note: BMI does not directly measure body fat, but it is a widely used indicator to evaluate general weight status.

Warning: This calculator is not suitable for athletes, pregnant women, or children. Always consult a healthcare professional for accurate evaluation.

Body Mass Index (BMI) is a numerical value derived from a person’s weight and height that is commonly used to assess whether an individual has a healthy body weight for their height. It provides a simple, standardized way to categorize weight status in adults and is widely used in clinical and public health settings.

How BMI is Calculated

BMI is calculated using the following formula:

  • Metric units:
  • Imperial units (U.S. customary):

Example (Metric):
If someone weighs 70 kg and is 1.75 m tall:

Example (Imperial):
If someone weighs 154 lbs and is 69 inches tall:

BMI Categories (for adults aged 20 and older)
Below 18.5
Underweight
18.5 – 24.9
Normal weight
25.0 – 29.9
Overweight
30.0 and above
Obesity

Note: These categories are general guidelines and may not account for factors like muscle mass, bone density, overall body composition, or ethnic differences.

Limitations of BMI

  • Does not distinguish between fat, muscle, or bone mass (e.g., athletes may have a high BMI but low body fat).
  • May not be accurate for older adults, children, pregnant women, or certain ethnic groups.
  • Not a direct measure of body fat or health risk—used as a screening tool, not a diagnostic one.

For a more comprehensive health assessment, BMI is often used alongside other measures like waist circumference, blood pressure, cholesterol levels, and lifestyle factors.

Category:

Health Calculations,
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