Free BMI Calculator

Body Mass Index, or BMI, is one of the most commonly used screening tools for assessing whether someone falls within a healthy weight range. It is not a diagnostic tool on its own - it does not measure body fat directly - but it gives a quick, useful estimate based on height and weight that doctors, fitness professionals, and individuals use as a starting point. This calculator supports both metric (cm/kg) and imperial (inches/lbs) units. Enter your height and weight, and the result updates instantly. You will see your BMI number along with the WHO classification - underweight, normal, overweight, or obese - and a visual indicator showing where you fall on the scale. One important caveat: BMI does not distinguish between muscle and fat. An athlete with significant muscle mass might register as "overweight" even though their body fat percentage is low. For most people, though, BMI is a reliable first check that can flag whether a deeper look at health metrics might be worthwhile. If your result falls outside the normal range, it is not a reason to panic - it is a reason to have a conversation with a doctor who can factor in things BMI cannot, like body composition, age, and overall health history.