# ACT and SAT Blog

Although your GPA is a very important number, many students find it confusing:

• How come it's a number from 0.0 to 4.0?
• What if your school gives out grades as percentages from 0 to 100?
• How do you go from letters to numbers?

As mentioned above, your GPA is the average of your entire high school academic performance. Essentially, they take all of your grades, add them together, and divide them by the number of grades, and voilá! You've got your GPA. But before you can add them all together, you need to convert them to the 0.0 to 4.0 scale that is used in GPA calculations. Here's how letter grades and percentages compare to GPA numbers:

Note that this is just a general table, and that some schools may have slightly different variations; however, this table should give you a good general idea of how letter grades compare to percent grades, and how they both compare to GPAs. Based on this chart, if the average of your grades was a 81, then you would have a GPA of around 2.7. If you had a C average, then your GPA would be a 2.0.

A tip for those of you who go to schools where the grades are given as letter grades: If your school doesn't give you a GPA or the average of your grades, and you want to get a good idea of what your GPA is, you could do the following: