Calculate your Body Mass Index using metric or imperial units and find your healthy weight range.
Body Mass Index (BMI) is a screening tool calculated from your weight and height: BMI = weight (kg) ÷ height (m)². In imperial units, the formula is BMI = (weight in lbs ÷ height in inches²) × 703. The result is a dimensionless number used to broadly categorise individuals into weight status groups as defined by the World Health Organisation (WHO).
BMI Prime is the ratio of your BMI to the upper limit of the normal range (25). A BMI Prime below 1.0 means you are in or below the normal range; above 1.0 means overweight or obese. It simplifies comparisons by expressing BMI as a single proportion rather than requiring knowledge of the category boundaries.
Research consistently shows South Asians carry higher body fat and face elevated cardiometabolic risk at lower BMI values than the WHO global thresholds suggest. Many Indian clinical guidelines use 23 kg/m² as the overweight threshold and 27.5 kg/m² as the obese threshold. This calculator uses standard WHO thresholds — consult your doctor for guidance specific to your ethnic background.
Medical disclaimer: BMI is a screening tool only, not a clinical diagnosis. Consult a qualified healthcare professional for personalised health assessment.
BMI is a useful general screening tool but has known limitations for athletes, older adults, and certain ethnic groups where muscle mass or body composition differs from the population BMI was originally calibrated on.
The WHO defines 18.5–24.9 as the normal range globally, though India's clinical guidelines recommend a slightly lower threshold of 23 for South Asian populations due to different disease risk at the same BMI.
No. Your data is calculated instantly in your browser and is never saved, transmitted, or stored anywhere.