BMI (Body Mass Index) attempts to measure:
1. **Body Fat Percentage**: BMI is a calculation based on a person's height and weight. It is used to estimate body fat and determine whether a person is underweight, normal weight, overweight, or obese. While it does not directly measure body fat percentage, it provides a general indication of a person's body fat levels based on their weight and height.
2. **Weight**: BMI primarily aims to assess a person's weight in relation to their height. By using a simple formula that takes into account these two factors, BMI provides a numerical value that indicates whether a person falls within a healthy weight range or if they are underweight, overweight, or obese.
In conclusion, BMI attempts to measure body fat percentage indirectly and primarily focuses on assessing weight in relation to height to categorize individuals into different weight status categories.