Multiply course grades by number of credits for each.

Add those numbers.

Divide by the total number of credits.

For any AP classes, add 1 point (unless you received a letter grade of a D or F, in which case don’t add the point), and for any Honor class, add 1/4 of a point. So for an AP class, if you got an A, give yourself 5 points instead of 4, if you got a B, then give yourself 4 points instead of 3. For hnors classes, if you got an A, give yourself 4 and 1/4 points instead of 4 points. Then, just calculate it the way you would your unweighted GPA, by converting the letter grades into numbers, adding them all up, and dividing by the number of classes you began with. So if you got straight A’s with 2 AP Classes and no Honor classes, then you would have a 4.2 GPA.