St. Marks has a specific way of calculating its students grade-point averages: Any numerical value in the A range carries the same weight, and the same goes for the other letter grades.
Furthermore, Honor and AP classes carry a 1.25x multiplier. Meaning a regular classes A, a 4.0, is weighted as a 5.0. A regular B, a 3.0, is weighted as a 3.75, etc.
To find out your GPA using this app, all you have to do is enter your grades letter values (A, B, C, D, or F).
Although the app is available and works on iPad, it is recommended to use it on iPhone for aesthetic reasons, and it was specifically made for the iPhone 8 Plus.
**NOTE: If the keyboard covers up a spot where you need to input a grade, simply click away from any buttons, the keyboard will go away, and then click on the spot where you need to input the grade.