BMI Calculator
Calculate your Body Mass Index (BMI) based on your height and weight. Instantly see if you're underweight, normal, overweight, or obese with our free BMI calculator.
BMI Categories
Underweight: < 18.5
Normal weight: 18.5-24.9
Overweight: 25-29.9
Obesity: ≥ 30
How It Works
What is BMI?
Body Mass Index (BMI) is a widely used screening tool that measures body fat based on height and weight. While it's not a diagnostic tool, it helps healthcare providers quickly assess potential weight issues and associated health risks.
How is BMI Calculated?
BMI is calculated using the formula: weight (kg) / [height (m)]². For imperial measurements, the formula is: [weight (lbs) / height (inches)²] × 703.
Understanding BMI Categories
- Underweight (BMI below 18.5): May indicate malnutrition or other health issues
- Normal weight (BMI 18.5-24.9): Generally considered healthy for most adults
- Overweight (BMI 25-29.9): May increase risk of health problems
- Obesity (BMI 30 or greater): Higher risk for several health conditions
BMI Limitations
While BMI is useful for population screening, it has several limitations:
- May overestimate body fat in athletes with high muscle mass
- May underestimate body fat in older persons or those with muscle loss
- Doesn't account for body fat distribution
- May not be suitable for all ethnic groups
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