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BMI Calculator
Calculate Body Mass Index
kg
cm
years
How to Use
About BMI
Body Mass Index (BMI) is a measure of body fat based on height and weight that applies to adult men and women.
BMI Categories (Adults)
- Below 18.5: Underweight
- 18.5 - 24.9: Normal/Healthy weight
- 25.0 - 29.9: Overweight
- 30.0 and above: Obese
How to Calculate
- Choose your preferred unit system (metric or imperial)
- Enter your weight and height
- Optionally enter age for age-specific interpretation
- Click Calculate to get your BMI and health assessment
Important Limitations
- BMI is a screening tool, not a diagnostic measure
- Does not distinguish between muscle and fat mass
- May not be accurate for athletes, pregnant women, or elderly
- Different ranges may apply for certain ethnic groups
- Consult healthcare providers for complete health assessment
Special Considerations
For seniors (65+), slightly higher BMI ranges are often considered healthier. This calculator adjusts interpretation for age when provided.
Try Sample Calculation
Click "Load Sample" to see a typical BMI calculation with example values.
Want to Save Calculations?
Sign in to save your calculations and track your BMI over time!