BMI Calculator
Your BMI Result
< 18.5
18.5-24.9
25-29.9
30-34.9
35-39.9
≥40
Health Recommendation
Your BMI is within the normal range. Continue maintaining a balanced diet and regular physical activity to stay healthy. Aim for at least 150 minutes of moderate-intensity exercise per week.
Understanding BMI
Body Mass Index (BMI) is a widely used, simple tool to estimate a person's body fat based on their height and weight. It's calculated by dividing an individual's weight in kilograms by the square of their height in meters (kg/m²).
This calculation places adults into categories:
- Underweight (<18.5)
- Healthy Weight (18.5–24.9)
- Overweight (25–29.9)
- Obese (≥30)
It provides a quick, initial screening method for potential weight-related health risks on a population level.
How to Calculate BMI
The formula for BMI is weight in kilograms divided by height in meters squared (kg/m²).
Metric Units (kg and cm):
BMI = weight (kg) / [height (m)]²
Imperial Units (lb and in):
BMI = [weight (lbs) / [height (in)]²] * 703
BMI Categories
| Category | BMI Range | Health Risk |
|---|---|---|
| Underweight | < 18.5 | High |
| Normal weight | 18.5 - 24.9 | Low |
| Overweight | 25 - 29.9 | Moderate |
| Obesity Class I | 30 - 34.9 | High |
| Obesity Class II | 35 - 39.9 | Very High |
| Obesity Class III | ≥ 40 | Extremely High |
Important Considerations
- BMI is not a direct measure of body fat
- Muscle mass can affect BMI readings
- May not be accurate for athletes, elderly, or pregnant women
- Consult a healthcare professional for personalized advice
Health Tips
Maintaining a healthy BMI reduces your risk for heart disease, diabetes, and certain cancers. Combine a balanced diet with regular physical activity for optimal health.