If you haven’t seen it, I have a grade calculator on my site. You enter in the grades you’ve made for each test/assignment thus far, and how much each test/assignment counts toward the final grade. You then enter what the minimum grade is needed for an A, B, C, D, etc. (If your school uses plus/minus grading, it can handle that too.) Then you hit the Calculate button and it tells you what you need to average for the remainder of the term in order to get whatever grade you want.
I developed it nine years ago, when I was teaching at the University of Memphis. My students were spending way too much time calculating their grades and not enough time studying, so I decided to create a tool that would help them. I have a tracker on the calculator, and toward the end of the semester, the hits go way way way up. Yesterday it got 944 hits and will probably break a thousand today.
Good luck on final exams, for those of you preparing to take them.