Calculate your Body Mass Index and understand where you fall on the WHO classification scale.
Frequently Asked Questions
BMI (Body Mass Index) is a simple screening metric calculated by dividing your weight in kilograms by the square of your height in meters (kg/m^2). It was developed by Adolphe Quetelet in the 1830s and is used by the WHO to classify weight status.
According to the WHO, a healthy BMI is between 18.5 and 24.9. Below 18.5 is underweight, 25-29.9 is overweight, and 30+ is obese. However, these ranges are based on population averages and may not apply equally to all individuals.
BMI has significant limitations. It does not distinguish between muscle and fat mass, so muscular individuals may be classified as overweight. It also does not account for body fat distribution, age, sex, or ethnicity. It works best as a population-level screening tool, not an individual diagnosis.
Body fat percentage is a more accurate indicator of body composition and health risk. BMI is useful as a quick screening tool but should be supplemented with other measurements like body fat percentage, waist circumference, or waist-to-hip ratio for a more complete picture.
The BMI formula itself does not account for age, but body composition changes with aging. Older adults tend to have more body fat and less muscle at the same BMI. Some health organizations suggest slightly higher BMI ranges may be acceptable for adults over 65.
BMI does not differentiate between muscle and fat. Athletes and muscular individuals may have a high BMI while being very healthy. Use body fat percentage for a more accurate picture.