BMI Calculator — Body Mass Index
Calculate your Body Mass Index to check if your weight is in a healthy range.
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What Is BMI?
Body Mass Index (BMI) is a measure of body fat based on height and weight. It's calculated by dividing weight in kilograms by height in meters squared, or equivalently, weight in pounds divided by height in inches squared times 703.
BMI Categories
The World Health Organization defines these categories: Underweight is below 18.5, Normal weight is 18.5 to 24.9, Overweight is 25 to 29.9, and Obese is 30 and above. These ranges apply to adults aged 20 and older.
Limitations of BMI
BMI doesn't distinguish between muscle and fat. Athletes with high muscle mass may have a "overweight" BMI despite being very fit. BMI also doesn't account for age, gender, bone density, or fat distribution. It's a screening tool, not a diagnostic one. Always consult a healthcare provider for a complete health assessment.
Frequently Asked Questions
A healthy BMI for adults is between 18.5 and 24.9. This range is associated with the lowest health risks from weight-related conditions.
BMI is a useful screening tool but has limitations. It doesn't distinguish between muscle and fat mass, so athletic individuals may show a higher BMI despite being healthy.