Tools
BMI Calculator
Enter your height and weight to instantly calculate your body mass index (BMI). See which category you fall in and the healthy weight range for your height. Metric or imperial units. Free, no sign-up.
Enter your height and weight; BMI is calculated instantly.
BMI is a general indicator; it does not distinguish muscle from fat. On its own it is not enough for athletes, pregnant people, children and the elderly. Consult a doctor for health decisions.
Body Mass Index: What It Says and What It Doesn't
Body mass index (BMI) is a simple ratio computed by dividing your weight by the square of your height, showing broadly which band a person's weight falls in relative to their height. In the World Health Organization classification, under 18.5 is underweight, 18.5–24.9 is normal (healthy), 25–29.9 is overweight and 30+ is obese. Being quick and practical, it is a common starting measure in health screenings and general assessments.
But BMI is not a complete health measure on its own: it does not distinguish muscle from fat, so it can label a very muscular athlete "overweight" or make someone with muscle loss look healthier than they are. It also ignores how fat is distributed in the body (especially waist circumference). So treat BMI as a starting signal; assess it together with waist circumference, body-fat percentage and overall lifestyle, and consult a doctor for important decisions.
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