Calculate your Body Mass Index (BMI) instantly. Free online BMI calculator with health category classification and tips.
Body Mass Index (BMI) is a simple measure that uses your height and weight to estimate whether you are underweight, at a healthy weight, overweight, or obese. While BMI does not directly measure body fat, it is a useful screening tool for potential health problems.
BMI = weight (kg) ÷ height² (m²)BMI is calculated by dividing your weight in kilograms by the square of your height in meters. The resulting number is used to classify your weight status into standard health categories.
| Input | Output |
|---|---|
| 70 kg, 170 cm | BMI: 24.2 (Normal weight) |
| 85 kg, 175 cm | BMI: 27.8 (Overweight) |
| 55 kg, 165 cm | BMI: 20.2 (Normal weight) |