There are a few different ways to calculate your percentage from your CGPA, depending on what you need it for.
If you're just looking for a quick estimate, you can use the Diploma CGPA Calculator. Just enter in your GPA and the number of credit hours you took, and it will give you an estimated percentage.
For a more accurate calculation, you can use the semester CGPA calculator. This will take into account the weight of each course you took and give you a more precise percentage.
Keep in mind that how your percentage is calculated may vary depending on the school or program you're applying to. So be sure to double check with them before assuming anything!