BMI Calculator - Assess Your Body Mass Index
Enter your height and weight to calculate your Body Mass Index (BMI). Get instant results and understand your weight status and health risks.
BMI Result
Healthy BMI Range
Healthy Weight Range
BMI Prime
Ponderal Index
Learn More About BMI
What is BMI?
BMI (Body Mass Index) is a widely used measurement that helps assess whether a person has a healthy body weight for their height. It serves as a screening tool to identify potential weight-related health issues.
BMI = weight(kg) / height²(m) or BMI = 703 × weight(lbs) / height²(inches)
Key Points to Remember
- BMI is an estimate that cannot account for body composition
- It should be used alongside other health measurements
- Different BMI ranges apply to children and teens
- BMI calculations may need adjustment for certain populations
BMI Classification Tables
BMI Table for Adults (Age 20+) (20+)
| Classification | BMI Range (kg/m²) |
|---|---|
| Severe Thinness | < 16 |
| Moderate Thinness | 16 - 17 |
| Mild Thinness | 17 - 18.5 |
| Normal | 18.5 - 25 |
| Overweight | 25 - 30 |
| Obese Class I | 30 - 35 |
| Obese Class II | 35 - 40 |
| Obese Class III | > 40 |
Health Implications
Risks of Being Overweight
- High blood pressure and cholesterol issues
- Type II diabetes
- Heart disease and stroke risks
- Osteoarthritis and joint problems
- Sleep apnea and breathing difficulties
- Increased risk of certain cancers
Risks of Being Underweight
- Malnutrition and vitamin deficiencies
- Weakened immune system
- Osteoporosis and bone fragility
- Growth and development issues
- Reproductive health problems
- Increased surgical complications
Limitations of BMI
Important Considerations
BMI is a screening tool, not a diagnostic measure. The following factors can affect BMI accuracy:
Age and Gender Limits
- Older adults tend to have more body fat
- Women generally have higher body fat
- Children require age-specific calculations
Body Composition
- Doesn't distinguish between fat and muscle
- Athletes may show as "overweight"
- Cannot measure fat distribution
Other Factors
- Ethnic variations not considered
- Pregnancy affects measurements
- Height extremes can skew results
