BMI Calculator
Calculate your Body Mass Index quickly and accurately
Privacy & Security
All BMI calculations are performed in your browser. No height, weight, or personal health information is stored, tracked, or transmitted to any server. Your privacy is completely protected.
What is BMI?
BMI (Body Mass Index) is a simple calculation using your height and weight to determine if you're at a healthy weight. It's calculated as weight in kilograms divided by height in meters squared (kg/m²). While BMI doesn't directly measure body fat, it's a useful screening tool to identify potential weight-related health risks. Our calculator supports both metric (kg/cm) and imperial (lbs/inches) measurements.
Key Features
Instant BMI Calculation
Get your BMI score and category immediately
WHO Standard Categories
Results based on World Health Organization guidelines
Metric & Imperial Units
Works with kg/cm or lbs/inches - your choice
Health Status Indicator
See if you're underweight, normal, overweight, or obese
Color-Coded Results
Visual indicators make understanding your status easy
Health Recommendations
Get general guidance based on your BMI category
No Registration
Completely free and anonymous - no signup required
Mobile Friendly
Works perfectly on all devices
How to Calculate Your BMI
Choose Your Units
Select metric (kg/cm) or imperial (lbs/inches) measurement system
Enter Your Weight
Input your current weight accurately
Enter Your Height
Input your height (can use feet+inches or total cm)
View Your Results
See your BMI score, category, and health recommendations instantly
Important Considerations
- BMI doesn't account for muscle mass - athletes may show high BMI despite being healthy
- Waist circumference is also important - excess abdominal fat increases health risks
- Age and sex can affect ideal BMI ranges
- Ethnicity matters - some populations have different healthy BMI ranges
- BMI is one tool among many - combine with other health assessments
- Consult healthcare providers for personalized health advice
Frequently Asked Questions
Is BMI an accurate measure of health?
BMI is a useful screening tool but has limitations. It doesn't distinguish between muscle and fat, doesn't account for bone density, and doesn't consider fat distribution. Athletes may have high BMI due to muscle. Use BMI as one indicator among many, not the sole measure of health.
What is a healthy BMI?
According to WHO standards, a healthy BMI for adults is between 18.5 and 24.9. This range is associated with the lowest risk of weight-related diseases. However, ideal BMI can vary based on age, sex, ethnicity, and muscle mass.
Does BMI work for children?
This calculator is designed for adults 18+. Children and teens require BMI-for-age percentile charts because their body composition changes with growth. Consult a pediatrician for child BMI evaluation.
Can BMI be misleading?
Yes. BMI can be misleading for athletes, bodybuilders, pregnant women, elderly, and certain ethnic groups. For example, athletes may be classified as overweight despite being healthy. It's best to consult healthcare providers who can assess body composition, waist circumference, and overall health.
How can I improve my BMI?
If your BMI is outside the healthy range, focus on sustainable lifestyle changes: balanced nutrition, regular physical activity, adequate sleep, and stress management. Aim for gradual weight loss/gain (1-2 lbs per week). Always consult healthcare professionals before starting any weight management program.
Why Check Your BMI?
Monitoring your BMI helps you understand your weight status and potential health risks. While not perfect, BMI is a quick, free screening tool that can indicate if you should consider lifestyle changes or consult a healthcare provider. Regular BMI checks, combined with other health metrics like waist circumference and body fat percentage, give you a clearer picture of your overall health status.