BMI Calculator
Calculate your Body Mass Index (BMI) quickly and for free. This tool uses the standard BMI formula to provide a weight category based on your height and weight. Understand your results with clear explanations and learn about the limitations of BMI as a general health indicator.
BMI Calculator
BMI Calculator
Calculate your Body Mass Index to assess your weight status and health risks
Enter Your Details
Fill in your weight and height above to calculate your BMI and see personalized results.
💪 Healthy Range
A BMI between 18.5 and 24.9 is considered healthy for most adults.
📊 Limitations
BMI doesn't account for muscle mass, bone density, or fat distribution.
📋 BMI Categories Table
| Category | BMI Range | Health Risk | Recommendation |
|---|---|---|---|
| Underweight | < 18.5 | Increased risk | Consider gaining weight |
| Normal weight | 18.5 - 24.9 | Lowest risk | Maintain current weight |
| Overweight | 25 - 29.9 | Moderate risk | Consider losing weight |
| Obese Class I | 30 - 34.9 | High risk | Lose weight |
| Obese Class II | 35 - 39.9 | Very high risk | Lose weight |
| Obese Class III | ≥ 40 | Extremely high risk | Consult doctor |
💡 About BMI
What is BMI?
Body Mass Index (BMI) is a measure of body fat based on your weight in relation to your height. It applies to most adult men and women aged 20 and over.
Limitations
BMI may overestimate body fat in athletes and others with muscular build, and underestimate body fat in older persons and others who have lost muscle mass.
Medical Use
BMI is used as a screening tool to identify potential weight problems, but diagnosis requires further assessment by a healthcare professional.
Use Cases
- Individuals quickly checking their body mass index for a general health snapshot.
- Fitness enthusiasts tracking their progress alongside other metrics over time.
- Healthcare professionals providing patients with an easy-to-use calculation tool.
- Health and wellness websites embedding a useful calculator for their audience.
- Educational purposes to understand how BMI is calculated and interpreted.
Key Features
Dual Unit Support
Calculate BMI using both Metric (kg, cm) and Imperial (lbs, feet/inches) units.
Instant Results
Get your BMI score and weight category immediately after clicking calculate.
Detailed Results Interpretation
See a clear explanation of your BMI category and what it generally indicates.
Health Context Disclaimer
Includes important information on BMI limitations (e.g., muscle mass, age, ethnicity).
Clean & Responsive Design
Works perfectly on desktop, tablet, and mobile devices for calculations on the go.
Frequently Asked Questions
BMI is calculated by dividing a person's weight in kilograms by the square of their height in meters (kg/m²). Our calculator handles this math for you, whether you use metric or imperial units.
According to WHO guidelines, a BMI between 18.5 and 24.9 is generally considered a healthy weight range. Below 18.5 is underweight, 25-29.9 is overweight, and 30 or above is classified as obesity.
BMI is a useful general screening tool but has limitations. It does not directly measure body fat percentage or distribution. It may misclassify very muscular individuals as overweight or not account for factors like age, sex, and ethnicity. It's best used as a starting point alongside other health assessments.
No. This calculator uses standard adult BMI categories. BMI is interpreted differently for children and teens, taking into account age and sex percentiles. A different calculator specifically designed for pediatric use is required.
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👨💻 About the Developer
Muhammad Abid Rahimi
Professional full-stack developer with expertise in creating high-performance web applications and tools. Specializing in PHP, MySQL, JavaScript, and modern web technologies. Passionate about building user-friendly interfaces and scalable backend systems that deliver exceptional user experiences.