Calculate Your Body Mass Index Instantly
How to Use This BMI Calculator
Follow these simple steps to calculate your BMI quickly and easily.
Enter Your Weight
Input your current weight and choose between kilograms (kg) or pounds (lb). Make sure to use accurate measurements for best results.
Enter Your Height
Input your height and choose between centimeters (cm) or feet/inches (ft/in). Stand straight when measuring for accuracy.
Add Optional Information
Enter your age and select your gender for more personalized insights and recommendations. This helps provide more accurate health guidance.
Review Your Results
Click "Calculate BMI" to get instant results. Review your BMI value, category, health status, and personalized recommendations.
BMI Calculation Examples
Normal Weight Adult
Overweight Adult
Underweight Adult
What is Body Mass Index (BMI)?
Body Mass Index (BMI) is a simple calculation using a person's height and weight. The formula is:
BMI is used as a screening tool to identify potential weight problems in adults. It's a quick and easy method, but it doesn't directly measure body fat.
Important Notes:
- BMI is not a diagnostic tool
- It may not be accurate for athletes with high muscle mass
- Different standards may apply for children and teens
- Consult healthcare providers for comprehensive health assessment
Frequently Asked Questions About BMI
Is BMI an accurate measure of health?
BMI is a useful screening tool, but it's not perfect. It doesn't account for muscle mass, bone density, overall body composition, or racial and sex differences. Always consult healthcare professionals for comprehensive health assessment.
How often should I calculate my BMI?
It's recommended to check your BMI every 3-6 months if you're monitoring weight changes, or annually as part of regular health checkups.
Does BMI apply to everyone?
BMI calculations may not be accurate for pregnant women, competitive athletes and bodybuilders, people over 65 years old, and children and teenagers (who require age and sex-specific BMI charts).
What should I do if my BMI is outside the normal range?
If your BMI indicates you're underweight or overweight, consult a healthcare provider or dietitian, consider lifestyle changes (diet and exercise), and get a comprehensive health assessment. Don't rely solely on BMI for health decisions.
Can I use BMI to track fitness progress?
BMI can be one metric, but it's better combined with other measurements like body fat percentage, waist circumference, muscle mass measurements, and overall fitness levels.
Why does my BMI differ from online calculators?
If using the same units (metric or imperial), all calculators should give the same result. Differences may occur if units are mixed, there are rounding differences, or measurement errors.
Lightning Fast Results
Get your BMI calculated instantly with our optimized algorithm. No waiting, no delays—just accurate results in milliseconds.
WHO Verified Categories
Our BMI categories follow World Health Organization standards, ensuring you get accurate and medically recognized classifications.
Customized Recommendations
Receive personalized health recommendations based on your BMI category, age, and gender for actionable insights.
Multiple Unit Support
Switch between metric (kg/cm) and imperial (lb/ft-in) units seamlessly. No conversion needed—we handle it all.
100% Private & Secure
All calculations happen in your browser. We don't store or transmit any of your personal health data.
Mobile Optimized
Calculate your BMI on any device. Our responsive design works perfectly on smartphones, tablets, and desktops.