Understand your Body Mass Index in metric or imperial units
Body Mass Index, or BMI, is a widely used screening measure that relates your weight to your height. It gives a quick, standardised number that indicates whether you fall into the underweight, healthy, overweight, or obese range according to World Health Organization thresholds. Our free BMI calculator makes finding that number effortless, accepting both metric inputs in kilograms and centimetres and imperial inputs in pounds, feet, and inches so you can use whichever system you are comfortable with.
Beyond the raw BMI figure, the calculator translates the result into a clear category and, importantly, shows the healthy weight range for your specific height. That range is derived by working backwards from the accepted healthy BMI band, giving you a concrete target rather than an abstract score. Seeing the actual weight span associated with a healthy BMI helps put your current figure into context and makes it easier to set realistic, informed goals.
BMI is a helpful starting point, but it is not a complete picture of health. It cannot tell muscle from fat, and factors such as age, sex, ethnicity, and body composition all matter. Athletes and very muscular individuals in particular may score high despite low body fat. Use this tool for general awareness and trend-tracking, and always consult a qualified healthcare professional before making significant decisions about your weight or wellbeing.