BMI Calculator

What is BMI Calculator?

Body Mass Index (BMI) is a standardized screening metric established by the World Health Organization (WHO) to classify adult weight status relative to height. Our BMI Calculator computes your exact BMI score, healthy weight target range, and international classification (Underweight, Normal, Overweight, Obese) in Metric or Imperial units directly in your browser with zero data storage.

Designed for accuracy, speed, and privacy, this tool runs entirely on your local device with zero network latency.

How to Use the BMI Calculator

1. 1
   Select your preferred measurement unit system: "Metric" (cm and kg) or "Imperial" (ft, in, and lbs).
2. 2
   Enter your current Height and Body Weight into the corresponding numeric input fields.
3. 3
   Review your calculated BMI value, color-coded WHO weight classification category, and healthy target weight bracket.
4. 4
   Compare your result against the adult Body Mass Index classification chart to guide your health and fitness planning.

Formula & Calculation Logic

Calculates the ratio of body mass to squared height in accordance with WHO Technical Report Series 854. Normal adult weight corresponds to a BMI between 18.5 and 24.9 kg/m².