BMI Calculator

Calculate your Body Mass Index (BMI) using your height and weight. BMI is a measure of body fat based on height and weight that applies to adult men and women.

Read more about BMI on Wikipedia
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More about BMI

BMI is a screening tool, not a diagnostic measure. It does not account for muscle mass, bone density, age, sex, or ethnicity. Consult a healthcare provider for a complete assessment.

Body Mass Index (BMI) is a simple calculation using a person's height and weight. The formula is BMI = kg/m2 where kg is a person's weight in kilograms and m2 is their height in metres squared.

BMI is a useful screening tool for identifying potential weight-related health issues in adults. However, it has limitations:

  • It does not directly measure body fat percentage

  • It may overestimate body fat in athletes and muscular individuals

  • It may underestimate body fat in older persons who have lost muscle mass

  • It does not account for differences in body composition between ethnic groups

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

  • Underweight: BMI less than 18.5 - May indicate nutritional deficiency or other health issues

  • Normal weight: BMI 18.5 to 24.9 - Generally considered a healthy range

  • Overweight: BMI 25 to 29.9 - May increase risk of certain health conditions

  • Obese Class I: BMI 30 to 34.9 - Moderate health risk

  • Obese Class II: BMI 35 to 39.9 - Severe health risk

  • Obese Class III: BMI 40 or greater - Very severe health risk

BMI should be used as a starting point for discussions with healthcare providers about overall health, rather than a definitive measure of health status.