Body Mass Index Calculator
Calculate your Body Mass Index (BMI) based on height and weight. BMI is a measure of body fat based on height and weight that applies to adult men and women.
Published by:
isCalculator Editorial Team
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How to use this tool?
How to Use the BMI Calculator
- Enter your weight in kilograms (kg) in the "Weight" field. Example:
70. - Enter your height in centimeters (cm) in the "Height" field. Example:
175. - Click the "Calculate BMI" button (or press Enter on your keyboard).
- Read your result displayed below the button:
- BMI value – a number rounded to one decimal place.
- Category – one of: Underweight, Normal weight, Overweight, or Obese.
- Formula breakdown – shows how the calculation was done.
This calculator uses the metric system (kg and cm). If your measurements are in pounds or feet/inches, convert them first.
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Frequently Asked Questions
Body Mass Index (BMI) is a measure of body fat based on your weight in relation to your height. It is used to screen for weight categories that may lead to health problems.
BMI is calculated by dividing your weight in kilograms by the square of your height in meters. The formula is: BMI = weight (kg) / (height (m))^2.
Underweight: BMI less than 18.5, Normal weight: 18.5–24.9, Overweight: 25–29.9, Obese: BMI of 30 or greater.
