BMI Calculator

A BMI calculator estimates body fat from your weight and height, giving a single number that places you in a recognised weight category. Enter your measurements in metric kilograms and centimetres or in imperial pounds and feet, and the calculator returns your Body Mass Index along with its category, from severe thinness through to obese class III. BMI is a screening figure rather than a diagnosis, so it does not separate muscle from fat and can read high for athletes. Use it as a quick indicator of whether your weight sits in the healthy range for your height.