BMI Calculator

Calculate BMI instantly with our online BMI calculator. Get valuable insights into your weight and health status.


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The BMI (Body Mass Index) calculator by IO Tools is a useful tool that helps individuals assess their body weight relative to their height. It calculates a numerical value that can be used to determine whether a person falls within a healthy weight range or if they are underweight, overweight, or obese. This documentation will guide you through the functionality and usage of the BMI calculator.

BMI Calculation Formula

BMI is calculated using the following formula:

BMI = weight (kg) / (height (m) * height (m))

The weight should be in kilograms, and the height should be in meters. If you have weight and height measurements in other units, you can convert them to the required units before performing the calculation.

Using the BMI Calculator

  1. Enter Weight and Height: To calculate your BMI, start by entering your weight and height in the respective input fields. Make sure to use the correct units (kilograms for weight and centimeters for height) to ensure accurate results.
  2. Automatic Calculation: The BMI calculator will automatically perform the calculation as soon as you enter the weight and height values. There is no need to click any additional buttons.
  3. BMI Result: Once the calculation is complete, the BMI value will be displayed in the designated output field. This value represents your calculated BMI and serves as an indicator of your body weight relative to your height.
  4. Interpretation: The BMI value alone does not provide a comprehensive assessment of your health but offers a general understanding of your weight status. The BMI categories are commonly used to interpret the results. These categories include Underweight, Normal Weight, Overweight, and Obesity (Class 1, 2, and 3). These categories can help you gauge where your BMI falls in terms of healthy weight ranges.
  5. Reset: If you wish to calculate the BMI for a different set of weight and height values, you can use the “Clear” button to reset the input fields and start anew.

Interpreting BMI Results

The BMI value obtained from the calculator can be interpreted based on the following categories:

  • Underweight: BMI less than 18.5
  • Normal Weight: BMI between 18.5 and 24.9
  • Overweight: BMI between 25 and 29.9
  • Obesity (Class 1): BMI between 30 and 34.9
  • Obesity (Class 2): BMI between 35 and 39.9
  • Obesity (Class 3): BMI 40 or greater

It’s important to note that while BMI provides an initial assessment of body weight, it does not account for factors such as muscle mass, body composition, and overall fitness level. Therefore, it’s advisable to consult with a healthcare professional for a comprehensive evaluation of your health status.

Trusted Source

For more information about BMI and its interpretation, you can refer to the World Health Organization (WHO) guidelines on BMI and obesity. The WHO provides globally recognized standards and classifications related to BMI and its implications for health.

Visit the WHO website at for authoritative information on BMI and related topics.

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