BMI Calculator
Get your Body Mass Index (BMI) instantly. This widely used screening figure combines your height and weight to show whether you fall inside a healthy weight band.
How the BMI Calculator Works
Enter your height and weight and the calculator applies the standard BMI formula: weight in kilograms divided by height in metres squared (kg/m²). If you use pounds and inches, the formula is (pounds ÷ inches²) × 703. Your result is then matched to the standard adult categories: underweight below 18.5, healthy from 18.5 to 24.9, overweight from 25 to 29.9, and obese at 30 or above.
BMI is a screening measure, not a diagnosis. It does not distinguish muscle from fat, so very muscular people can score high while being lean, and it is not designed for children, pregnancy, or competitive athletes. For a full explanation with worked examples, read our guide: What Is BMI? How to Calculate BMI and What It Means.
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