BMI Calculator
Body Mass Index (BMI) is a widely used screening tool to assess weight relative to height. Our BMI calculator supports both imperial (lbs/inches) and metric (kg/cm) units and provides a clear health category result.
Your BMI
24.4
What this calculator does
Body Mass Index (BMI) is a widely used screening tool to assess weight relative to height. Our BMI calculator supports both imperial (lbs/inches) and metric (kg/cm) units and provides a clear health category result.
How the calculation works
BMI = weight(kg) / height(m)². For imperial: BMI = (weight in lbs / height in inches²) × 703. Categories: Below 18.5 = Underweight, 18.5–24.9 = Normal, 25–29.9 = Overweight, 30+ = Obese. Note that BMI is a screening tool, not a diagnostic tool.
Examples
170 lbs, 5'10" — Imperial
A common height and weight combination in imperial units.
80 kg, 175 cm — Metric
A standard metric calculation.
Frequently asked questions
Is BMI accurate?
BMI is a useful screening tool but has limitations. It doesn't distinguish between muscle and fat, doesn't account for age, sex, or ethnicity, and isn't diagnostic on its own. Athletes may have high BMI but low body fat.
What is a healthy BMI range?
The standard healthy BMI range is 18.5 to 24.9. However, some health organizations suggest that optimal ranges may vary by age and ethnic background.
What is a BMI of 30?
A BMI of 30 or above is classified as Obese (Class I). This is associated with increased risk of type 2 diabetes, heart disease, and other conditions. A healthcare professional can assess individual risk.