BMI Calculator
Calculate your Body Mass Index based on WHO standards
Free, accurate, and instant results with personalized health recommendations
Valid range: 10 - 500 kg
Valid range: 30 - 300 cm
Result
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❓ How do I calculate BMI?
BMI (Body Mass Index) is calculated using a simple formula:
BMI = Weight (kg) ÷ Height (m)²
Simply enter your weight and height into our calculator above, and it will automatically compute your BMI. Our tool supports both metric (kg, cm) and imperial (lb, ft) units for your convenience. Regardless of which unit you choose, the calculator internally converts to metric and uses the standard formula above.
✅ Normal BMI
A normal BMI is typically considered to be between 18.5 and 24.9. This range indicates that your weight is proportionate to your height and is generally associated with lower health risks.
💚 Normal BMI Range: 18.5 - 24.9
Maintaining a normal BMI is associated with better overall health outcomes and reduced risk of chronic diseases.
To maintain a normal BMI, focus on:
- Regular physical activity (at least 150 minutes per week)
- A balanced diet rich in fruits, vegetables, and whole grains
- Adequate sleep and stress management
- Regular health check-ups
📊 What are the BMI ranges?
Underweight
BMI: Below 18.5
May indicate insufficient weight. Consider consulting healthcare provider.
Normal Weight
BMI: 18.5 - 24.9
Healthy weight range. Maintain with regular exercise and balanced diet.
Overweight
BMI: 25.0 - 29.9
Slightly above healthy range. Consider increasing activity and adjusting diet.
Obese
BMI: 30.0 and above
Increased health risks. Consult healthcare provider for personalized guidance.
Note: BMI is a screening tool and does not directly measure body fat or account for muscle mass, bone density, or other factors.
🔧 Using our body mass index calculator
Our BMI calculator is easy to use and provides instant results:
- Select Your Unit: Choose between metric (kg, cm) or imperial (lb, ft) units at the top.
- Enter Your Gender (Optional): Select your gender to help personalize health recommendations.
- Input Your Weight: Enter your weight in the selected unit.
- Input Your Height: Enter your height in the selected unit.
- Auto-Calculate: Your BMI will be calculated automatically as you type valid values.
- View Results: Your BMI, category, and personalized advice will appear instantly below the inputs.
💡 Pro Tip: BMI is calculated automatically as you enter values. Your calculation history is saved automatically, allowing you to track your progress over time.
🎯 Other considerations
While BMI is a useful screening tool, it's important to consider other factors:
🏋️ Muscle Mass
Muscular individuals may have a higher BMI but lower body fat percentage. BMI doesn't distinguish between muscle and fat.
🧬 Genetic Factors
Genetics influence metabolism, body composition, and weight distribution. What's healthy varies from person to person.
📏 Body Composition
Distribution of fat, bone, and muscle affects overall health. Two people with the same BMI may have different health profiles.
👴 Age and Gender
BMI interpretation may differ based on age and gender. Children, elderly, and certain populations may have different healthy ranges.
🏥 Medical Conditions
Certain medical conditions can affect weight and BMI. Always consult healthcare professionals for comprehensive health assessment.
❔ FAQs
Q: Is BMI accurate for everyone?
A: BMI is a screening tool, not a diagnostic measure. It may not be accurate for athletes, elderly people, children, or pregnant women. Always consult healthcare professionals for personalized assessment.
Q: How often should I calculate my BMI?
A: You can track BMI monthly or quarterly as part of your health monitoring routine. Significant changes should prompt a consultation with your healthcare provider.
Q: Can BMI predict health?
A: BMI is correlated with health risks but doesn't predict individual health. Other factors like blood pressure, cholesterol, fitness level, and family history are equally important.
Q: What should I do if my BMI is outside the normal range?
A: Consult with a healthcare provider or registered dietitian. They can provide personalized guidance based on your individual health profile and circumstances.
Q: Does BMI account for muscle mass?
A: No, BMI only uses height and weight. For a complete body composition analysis, consider additional measurements like waist circumference or body fat percentage.
Q: Can I use this calculator for children?
A: This calculator is designed for adults. Children and teens have different BMI categories based on age and gender percentiles. Consult your pediatrician for children's BMI assessment.