Free BMI Calculator
Calculate your Body Mass Index (BMI) using your height and weight. This calculator is intended for adults aged 20 and over.
Your BMI
BMI is a screening measure, not a medical diagnosis.
What is BMI?
Body Mass Index (BMI) is a measure calculated from your height and weight. It can help indicate whether your weight is within a commonly used range for your height.
Adult BMI Categories
- Below 18.5: Underweight
- 18.5–24.9: Healthy weight
- 25–29.9: Overweight
- 30 or above: Obesity
How is BMI Calculated?
BMI = Weight (kg) ÷ Height (m)²
BMI does not directly measure body fat and may be less informative for athletes, pregnant people and some other groups. BMI thresholds can also vary by ethnicity and clinical guidance. Speak to a healthcare professional for individual advice.