Understanding Body Mass Index (BMI)
Body Mass Index (BMI) is a simple calculation using a person's height and weight. The formula is used to classify individuals into weight categories like underweight, normal weight, overweight, and obese. It's a widely used screening tool for potential weight-related health problems.
How is BMI Calculated?
The calculation differs slightly depending on the units used:
- Metric Formula: BMI = weight (kg) / [height (m)]²
- Imperial Formula: BMI = 703 x weight (lbs) / [height (in)]²
Our calculator handles both metric and imperial units automatically for convenience.
Limitations of BMI
While easy to use, BMI is an indirect measure and has limitations. It doesn't account for body composition (muscle vs. fat mass), age, sex, or fat distribution. For instance, athletes with high muscle mass may have a high BMI but low body fat, while elderly individuals may have normal BMI but higher body fat. BMI should be used as a screening tool, not a definitive diagnosis of health.