BMI Calculator
Body Mass Index — enter your weight and height to get started.
BMI is a screening tool, not a diagnosis. It does not distinguish between muscle and fat mass. Always double-check results and consult a healthcare professional for a comprehensive health evaluation.
Enter your weight and height above to calculate your BMI.
What is BMI and what are its limitations?
BMI (Body Mass Index) is a screening tool that estimates body fat based on height and weight. It is calculated as weight (kg) divided by height squared (m²).
While useful for population-level health assessments, BMI does not distinguish between muscle and fat mass. Athletes may have a high BMI despite low body fat. Always consult a healthcare professional for a comprehensive health evaluation.
About the BMI Calculator
Body Mass Index (BMI) is a widely used screening tool that estimates body fat based on a person's weight and height. It is calculated by dividing weight in kilograms by height in meters squared (kg/m²). The resulting number places you into one of four categories: underweight, normal weight, overweight, or obese.
Our BMI calculator updates instantly as you type — no page reload, no form submission. Simply enter your weight in kilograms and height in centimeters, and your BMI appears immediately on a visual gauge that shows exactly where you fall on the weight spectrum. The healthy BMI range of 18.5–24.9 is highlighted for easy reference.
While BMI is an excellent population-level screening tool, it has limitations at the individual level. It does not distinguish between muscle and fat mass — athletes and bodybuilders may register as overweight or obese despite having very low body fat. Similarly, older adults may have a "normal" BMI while carrying excess fat due to age-related muscle loss. For a complete health assessment, always consult a healthcare professional.