BMI Calculator
Calculate Body Mass Index from weight and height.
Body Mass Index is a quick screen for whether your weight is in a healthy range for your height. It's a general guide, not a diagnosis.
How the Math Works
The Body Mass Index (BMI) is calculated using a simple mathematical formula that relates a person's weight to their height squared. To determine BMI, divide an individual's weight in kilograms by the square of their height in meters. For example, someone who weighs 70 kg and is 1.75 meters tall would have a BMI of 70 ÷ (1.75 × 1.75), which equals approximately 22.9. This standardized calculation provides a quick numerical indication of body fatness based on easily measurable quantities.
Practical Applications
To use the BMI calculator, simply enter your current weight in kilograms and your height in meters (or centimeters, which the calculator will convert). The calculator then applies the formula automatically and presents your BMI score along with the corresponding weight category. This process takes only seconds and requires no special equipment beyond a scale and measuring device, making it accessible for personal use at home, in the office, or during medical visits when quick health assessments are needed.
Day-to-Day Use
Your BMI result serves as a valuable health indicator that can guide important lifestyle decisions. It helps you understand whether you're maintaining a healthy weight range, which can influence dietary choices, exercise routines, and conversations with healthcare providers. A BMI in the normal range suggests balanced nutrition and activity levels, while higher results may motivate you to adopt healthier habits. This tool supports proactive health management by providing immediate feedback on your wellness status and tracking progress toward health goals over time.
Worked example
70 kg, 175 cm → 70 ÷ 1.75² = 22.9 (normal weight).
FAQ
Is BMI accurate for athletes?
Not always — muscle is dense, so very muscular people can show a high BMI without excess fat.