Calculate your Body Mass Index (BMI) instantly to understand your weight-to-height ratio.
Body Mass Index (BMI) is a measure of body fat based on height and weight that applies to adult men and women. Formula: BMI = kg/m². A BMI between 18.5 and 24.9 is considered the "Healthy Weight" range. Over 25 is Overweight, and over 30 is Obese.
A simple screen for your health status.
Formula:
BMI = Weight / (Height * Height)A person 180cm tall weighing 75kg.
Result: BMI = 23.1 (Normal Weight).
A person 170cm tall weighing 90kg.
Result: BMI = 31.1 (Obese).
Yes, the calculation formula is the same for adult men and women, although fat distribution patterns may differ.
BMI for children (up to 20) is calculated differently and requires specific growth charts that account for age and gender.
It does not distinguish between muscle mass and body fat. A bodybuilder may be "obese" according to BMI but perfectly healthy.
BMI is a screening tool, not a diagnostic one. It does not directly measure body fat. Athletes with high muscle mass may have a high BMI but low body fat. The World Health Organization (WHO) defines standard BMI categories for adults. Normal range: 18.5–24.9; Overweight: 25.0–29.9; Obese: 30.0 or higher.
BMI follows a U-shaped health risk curve. Both very low BMI (malnutrition risk) and very high BMI (cardiovascular and metabolic risk) are associated with increased health complications. Maintaining a stable BMI in the "Normal" range typically correlates with lower long-term health risks.
Learn how to calculate BMI accurately. Discover what BMI means, how it relates to body fat percentage, and why it matters for your health. Compare BMI vs body composition analysis.