BMI Calculator
Calculate your Body Mass Index and its standard classification.
Information: This tool is informational only and does not replace medical advice.
How is this result calculated?
BMI is calculated with the formula BMI = weight (kg) / height (m)², where weight is expressed in kilograms and height in meters.
The category shown follows the standard World Health Organization (WHO) classification for the adult population: underweight below 18.5, normal weight from 18.5 to 24.9, overweight from 25 to 29.9, and obesity from 30 upward.
BMI is a broad statistical indicator: it measures neither fat mass nor muscle mass. This result is provided for informational purposes only and does not replace medical advice.
Frequently asked questions
What are the limitations of BMI as an indicator?+
BMI is a broad statistical indicator calculated from weight and height: it doesn't distinguish fat mass from muscle mass and doesn't account for how fat is distributed across the body. Two people with the same BMI can have very different body compositions.
Is BMI suitable for athletes, children, or older adults?+
Not necessarily. In people with a lot of muscle mass, BMI can be high without excess fat. For children and teenagers, interpretation relies on age-specific growth charts, different from the calculation used here for adults. In older adults, body composition also changes over time. In these situations, advice from a healthcare professional is more appropriate than this indicator alone.
What BMI range is considered normal?+
Under the standard World Health Organization (WHO) classification for adults, a normal weight is considered to fall between 18.5 and 24.9.
How is BMI calculated?+
BMI is calculated by dividing weight (in kilograms) by the square of height (in meters): BMI = weight / height².
Is BMI different for men and women?+
No. The standard classification used here is the same for both sexes and does not account for individual body shape.
What should I do if my BMI is outside the normal range?+
This result is purely informational. For any question about your health or weight, the best approach is to talk to a healthcare professional, who can take your overall situation into account.