TinyBMICalculatorInstantly calculate your BMI and discover your healthy weight range.
BMI Calculator
Calculate your body mass index instantly
How to Use Our Global BMI Calculator
How to Calculate Your BMI
- 1. Choose Units: Select metric (kg/cm) or imperial (lbs/inches) system
- 2. Enter Height: Your height in centimeters or inches (for imperial, enter total inches)
- 3. Enter Weight: Your current weight in kilograms or pounds
- 4. Optional Info: Add age and gender for more personalized recommendations
- 5. View Results: Get instant BMI calculation with health category and insights
Understanding Your BMI Results
- BMI Score: Your body mass index calculated from height and weight
- Health Category: Classification based on WHO standards
- Healthy Weight Range: Ideal weight range for your height
- Recommendations: Personalized health and lifestyle advice
- Progress Tracking: Save calculations to track your health journey
Frequently Asked Questions - September 2025 BMI Calculator
How accurate is this BMI calculator?
Our calculator uses the standard WHO BMI formula (weight in kg ÷ height in m²) for precise calculations. BMI is an imperfect measure that should be considered alongside other health assessments. It provides a general indication of weight status but doesn't account for muscle mass, bone density, body composition, or individual health factors.
What's the difference between metric and imperial units?
Metric uses kilograms and centimeters, while imperial uses pounds and inches. Our calculator automatically converts between units and provides the same accurate BMI regardless of which system you choose.
Is BMI accurate for everyone in September 2025?
WHO BMI categories are designed for adults and may not accurately reflect health status for athletes with high muscle mass, pregnant women, elderly individuals, or those with certain medical conditions. BMI is an imperfect measure that should be considered alongside other health assessments and professional medical advice.
What should I do if my BMI indicates I'm overweight or obese?
Consult with a healthcare provider for personalized advice. They can assess your overall health, consider other factors, and help create a safe and effective plan for reaching a healthy weight.
How often should I calculate my BMI?
For general monitoring, monthly BMI calculations are sufficient. If you're actively working on weight changes, weekly measurements can help track progress while avoiding daily fluctuations.
Can I use this calculator for children and teenagers?
Adult BMI categories don't apply to children and teens. For those under 18, use pediatric BMI-for-age percentile charts available from health organizations like the CDC or your local health authority.