BMI Calculator
Enter your height and weight to instantly get your BMI, weight category and healthy weight range.
Categories follow Taiwan’s Ministry of Health and Welfare standard (Asian cutoffs): Underweight <18.5, Normal 18.5–24, Overweight 24–27, Obese I 27–30, Obese II 30–35, Obese III ≥35. BMI is a rough health reference only — it does not reflect body-fat or muscle and does not apply to pregnant women, athletes, growing children or the elderly. Consult a medical professional if in doubt.
About Body Mass Index (BMI)
BMI (Body Mass Index) is your weight in kilograms divided by the square of your height in metres, commonly used as a first check of whether your weight sits in a healthy range. Enter your height and weight and this tool instantly computes your BMI, classifies it as underweight, normal, overweight or obese (using Taiwan’s standard), and works out the kilogram range that corresponds to a normal BMI (18.5–24) at your current height.
BMI is only a reference and does not distinguish fat from muscle, so very muscular athletes may be classed as overweight; it also does not suit pregnant women, growing children and teenagers, or the elderly. All calculation runs in your browser; the values you enter are never uploaded or stored on a server.