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
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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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