To calculate your Body Mass Index (BMI), you can use the following formula: BMI = weight in kilograms / height in meters squared. You can also use an online BMI calculator, such as the one provided by the Centers for Disease Control and Prevention (CDC).

The CDC's BMI calculator is a useful tool that takes into account your age, gender, height, and weight to provide a BMI value and corresponding weight status. It also computes the Ponderal Index, which is another measure of body mass.

To use the calculator, simply enter your age, gender, height, and weight, and the calculator will provide your BMI value and corresponding weight status. The calculator is available in both metric and US units.

Here is an example of how to use the calculator:

- Age: 25
- Gender: Female
- Height: 5 feet 6 inches (168 cm)
- Weight: 150 pounds (68 kg)

Using the calculator, the result would be:

- BMI = 23.4 kg/m2 (Normal)
- Healthy BMI range: 18.5 kg/m2 - 25 kg/m2
- Healthy weight for the height: 59.9 kg - 81 kg
- BMI Prime: 0.8
- Ponderal Index: 11.1 kg/m3

Keep in mind that BMI is not a perfect measure of healthy body weight, as it does not take into account muscle mass or body composition. However, it can be a useful indicator of whether you are at a healthy weight for your height.