Health & Fitness
BMI Calculator
Free online BMI calculator — calculate your Body Mass Index using the WHO formula. Supports metric and imperial units with instant results.
Calculator
BODY METRICS
Enter your measurements
Use metric measurements or switch to imperial units.
YOUR BMI
UNDERSTAND YOUR RESULT
What Is BMI?
Body Mass Index (BMI) is a screening measure based on height and weight. It can help indicate whether weight falls within a commonly used range, but it does not directly measure body fat.
CategoryBMI range
UnderweightBelow 18.5
Normal weight18.5 – 24.9
Overweight25.0 – 29.9
Obese30.0 and above
BMI Formulas
Metric BMI = weight (kg) / height (m)²
Imperial BMI = (weight (lb) × 703) / height (in)²
Limitations of BMI
BMI is useful for screening, but it does not account for muscle mass, bone density, age, or body composition. For additional context, you can also use our Body Fat Calculator.