BMI Calculator – Calculate Your Body Mass Index
100% FreeCalculate your Body Mass Index (BMI) from height and weight. See your BMI category — underweight, normal, overweight, or obese — with health guidance.
What is BMI Calculator?
The Body Mass Index (BMI) calculator is an internationally recognized health screening tool established by the World Health Organization (WHO). It evaluates your body mass relative to your height, helping classify whether you are underweight, normal weight, overweight, or obese.
BMI provides a valuable baseline metric for adults to gauge general health risk categories associated with excess body fat, such as cardiovascular disease, hypertension, and type 2 diabetes.
Our calculator supports both Metric (centimeters & kilograms) and Imperial (feet, inches & pounds) measurement systems, accompanied by a visual classification breakdown and ideal weight range recommendations.
How to Use BMI Calculator
Follow these simple steps to achieve perfect results in seconds.
1. Select Unit System
Choose between Metric (cm / kg) or Imperial (feet / inches / lbs).
2. Enter Height & Weight
Input your accurate height and current body weight.
3. View Your Health Category
Instantly view your calculated BMI score, health classification, and healthy weight target range.
Key Features
- Dual unit support: seamless Metric and Imperial calculation modes
- WHO-standard classification brackets: Underweight, Normal, Overweight, Obese
- Target healthy weight interval calculations based on ideal BMI (18.5 – 24.9)
- 100% private: all calculations run locally in your browser with zero data logging
Benefits & Advantages
- Assess your weight category accurately in seconds
- Establish realistic fitness goals and nutritional targets
- Monitor body transformation progress over time
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