Adult BMI Calculator with Risk Gauge
Calculate your Body Mass Index (BMI) and visualize health risks with a dynamic gauge. Includes WHO classification and metabolic risk profiles.
Health Implications:
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About
The Quetelet Index, commonly known as BMI, is the standard heuristic for classifying weight relative to height. While it does not distinguish between muscle and fat, it serves as a critical preliminary screening tool for public health. This calculator goes beyond the simple number by mapping the result to a visual "Risk Gauge." It helps identify potential associations with cardiovascular diseases, type 2 diabetes, and hypertension. The tool adheres strictly to World Health Organization (WHO) cutoffs.
Formulas
The Body Mass Index is calculated as mass divided by height squared.
If using Imperial units (lbs, inches), a conversion factor of 703 is applied:
Reference Data
| Classification | BMI Range (kg/m2) | Health Risk Profile |
|---|---|---|
| Underweight | < 18.5 | Risk of nutritional deficiency, osteoporosis, and immune dysfunction. |
| Normal Range | 18.5 - 24.9 | Lowest statistical risk of weight-related chronic diseases. |
| Overweight | 25.0 - 29.9 | Moderate increased risk of cardiovascular issues and fatigue. |
| Obese Class I | 30.0 - 34.9 | High risk of hypertension, diabetes, and sleep apnea. |
| Obese Class II | 35.0 - 39.9 | Very high risk. Medical intervention often recommended. |
| Obese Class III | ≥ 40.0 | Extremely high risk (Morbid Obesity). Significant impact on life expectancy. |