You need to know how many credits you’ve taken so far, and how many you’re taking this semester. For example, let’s say you’re a sophomore currently. So you’ve completed 2 semesters, of 16 credits each (my school used the 4×4 system – 4 4-hour classes per semester). That’s 32 credits. So the total points you earned so far is 32×2.76 = 88.32 Now you’re estimating an additional 16×1.85 points this semester. That’s 29.6. At the end of this semester, then, you’ll have a total of 48 credits and 117.92 points. 117.92 / 48 = 2.456666667 GPA.