Body Mass Index (BMI)
Screening index for weight status using height and weight.
BMI = kg / m²
Patient parameters
Adjust values, then click Calculate.
Visual indicator
Interpretation Table
| BMI (kg/m²) | Category |
|---|---|
| < 18.5 | Underweight |
| 18.5 – 24.9 | Normal weight |
| 25.0 – 29.9 | Overweight |
| 30.0 – 34.9 | Obesity (Class I) |
| 35.0 – 39.9 | Obesity (Class II) |
| ≥ 40.0 | Severe Obesity |
What is BMI?
Body Mass Index (BMI) is a simple numerical value derived from a person’s weight and height. It is commonly used as a screening tool to categorize individuals into different weight ranges and assess potential health risks related to body weight.
Formula Used
BMI = weight ÷ [height]²
How to Use
- Enter your weight (in kilograms or pounds).
- Enter your height (in meters/centimeters or inches/feet).
- Click the calculate button.
- The calculator will display your BMI value and corresponding category based on standard ranges.
Clinical Significance
BMI is widely used in healthcare to identify potential weight-related health risks. Higher BMI levels are associated with increased risk of conditions such as cardiovascular disease, type 2 diabetes, and hypertension, while low BMI may indicate malnutrition or other underlying health issues.
However, BMI does not directly measure body fat or account for muscle mass, bone density, age, or sex, so it should be interpreted alongside other clinical assessments.
Disclaimer
This BMI calculator is intended for informational and educational purposes only. It does not provide medical advice, diagnosis, or treatment. Always consult a qualified healthcare professional for personalized health assessment and recommendations.
References
- World Health Organization (WHO) – BMI Classification
- Centers for Disease Control and Prevention (CDC) – About Adult BMI
- National Institutes of Health (NIH) – BMI Guidelines
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Surface area estimate frequently used in dosing workflows.
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Ideal Body Weight
Reference weight estimate based on height and sex.
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Total Daily Energy Expenditure (TDEE)
Estimated daily calories including activity.
TDEE = BMR × activity factor
For educational use only. Results are estimates and do not replace professional medical advice, diagnosis, or treatment.