What is BMI and How to Calculate It Accurately?

Learn about Body Mass Index (BMI), how to calculate it, and interpret results to understand your ideal weight and physical health.

What is Body Mass Index (BMI)?

Body Mass Index (BMI) is a medical measurement used to assess whether a person's weight is appropriate for their height. It's calculated by dividing weight in kilograms by the square of height in meters.

BMI Formula

BMI = Weight (kg) ÷ (Height in meters)²

Example: A person weighing 70 kg and 1.75m tall: BMI = 70 ÷ (1.75)² = 22.9

BMI Results Interpretation

Below 18.5: Underweight
18.5 - 24.9: Normal weight
25 - 29.9: Overweight
30 or above: Obese

Is BMI Always Accurate?

While BMI is widely used, it doesn't distinguish between fat and muscle. Athletes may show high BMI despite excellent health. Use it as an initial indicator, not a final diagnosis.

Calculate Your BMI Now

Use Toolsera's free BMI Calculator to get your result instantly with a comprehensive interpretation of your health status.