Body Mass Index (BMI) is a helpful tool to determine whether an individual falls within a healthy weight range. However, it does not directly measure body fat. To estimate body fat, one can use a formula that takes into account the BMI, age, and gender of the person.

The formula for men is (1.20 x BMI) + (0.23 x age) – 16.2, while the formula for women is (1.20 x BMI) + (0.23 x age) – 5.4. The result of the formula is the estimated body fat percentage. It’s important to note that this is just an estimate and can vary depending on factors such as muscle mass and body composition.

While BMI (Body Mass Index) is a measure of body fat based on height and weight, it does not directly measure body fat percentage. However, there are equations that can estimate body fat percentage using BMI. One such equation is the Jackson and Pollock 7-site skinfold formula, which estimates body fat using skinfold measurements at seven different locations on the body. Another equation is the Siri equation, which estimates body fat based on BMI, age, and gender. To use the Siri equation:

- Calculate BMI by dividing weight in kilograms by height in meters squared.
- Use the Siri equation: %Body Fat = (495 / BMI) – (450 / Age) + (0.292 x Gender) – 14.03 Where Gender is 1 for males and 0 for females. Keep in mind that these equations are estimates, and the most accurate way to measure body fat is through methods like DEXA scans or hydrostatic weighing.

To know your bmi use this BMI Calculator online free.