BMI Calculator
BMI Information Tables
Understanding Body Mass Index categories, health risks, and recommendations
Body Mass Index (BMI) is a simple index of weight-for-height that is commonly used to classify underweight, overweight, and obesity in adults. It is defined as a person's weight in kilograms divided by the square of their height in meters (kg/m²).
BMI Categories and Information
| Category | BMI Range | Health Risk |
|---|---|---|
| Underweight | < 18.5 | High |
| Normal weight | 18.5 - 24.9 | Low |
| Overweight | 25 - 29.9 | Moderate |
| Obesity Class I | 30 - 34.9 | High |
| Obesity Class II | 35 - 39.9 | Very High |
| Obesity Class III | ≥ 40 | Extremely High |
This table shows the standard BMI categories established by the World Health Organization. Maintaining a BMI in the normal weight range is associated with the lowest health risks.
| BMI Category | Potential Health Risks |
|---|---|
| Underweight | Malnutrition, osteoporosis, decreased immunity |
| Normal weight | Lowest risk of weight-related health issues |
| Overweight | Increased risk of heart disease, type 2 diabetes |
| Obesity Class I | High blood pressure, sleep apnea, gallbladder disease |
| Obesity Class II | Severe health risks, coronary heart disease |
| Obesity Class III | Multiple health conditions, significantly reduced life expectancy |
This table outlines the health risks associated with different BMI categories. It's important to note that BMI is just one indicator of health and should be considered alongside other factors.
| BMI Category | Recommended Action |
|---|---|
| Underweight | Consult doctor, balanced nutrition, strength training |
| Normal weight | Maintain weight, regular exercise, balanced diet |
| Overweight | Moderate weight loss, increase physical activity |
| Obesity Class I | Weight loss program, medical supervision |
| Obesity Class II | Medical intervention, structured weight loss plan |
| Obesity Class III | Comprehensive medical treatment, possible surgery |
This table provides general recommendations based on BMI categories. Always consult with a healthcare professional before starting any weight management program.
Important Note: While BMI is a useful screening tool, it does have limitations. It may not accurately reflect body fat distribution or muscle mass. Athletes with high muscle mass may have a high BMI but not have excess body fat. Always consult with a healthcare provider for a comprehensive health assessment.
A straightforward calculation called the Body Mass Index (BMI) determines if your weight is within a healthy range for your height. It categorizes results into underweight, healthy weight, overweight, and obesity (with three groups for obesity) and is applicable to individuals 20 years of age and older. Although BMI is a helpful screening tool, it does not directly assess body fat or take into consideration bone density, muscle mass, or total body composition. To get a full picture of your health, use this calculator as a starting point and talk to a healthcare provider about your findings.
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