BMI Calculator
Calculate BMI (Body Mass Index) from height and weight
BMI (Body Mass Index) is an international standard for determining obesity based on height and weight. Formula: BMI = Weight (kg) / Height (m)²
WHO BMI Classification
Below 18.5
Underweight
18.5 - 24.9
Normal weight
25.0 - 29.9
Overweight
30.0 - 34.9
Obesity Class I
35.0 - 39.9
Obesity Class II
40.0 and above
Obesity Class III
About this tool
The BMI Calculator computes Body Mass Index from height and weight and shows which standard category the result falls into. It's intended as a personal reference, not a medical diagnosis.
Common use cases
- Track BMI changes alongside a weight-loss or muscle-gain plan.
- Provide a quick personal-health reference during fitness check-ins.
- Compare BMI under metric and imperial units when reading mixed sources.
- Discuss healthy weight ranges in education or coaching contexts.