Uh oh.. finals coming up! What grade do I need to get to get an A or B in the course?? Enter Finals! Grade Calculator. Simply adjust the sliders to your current grade, weighting of your final, and, optionally, your desired grade in the course to find the grade you need on the final to get an A, B, or C in the course. Lets say you have an 89% in Physics and the final is worth 40% of your grade. What do you need on the final to get an A? Finals! Grade Calculator would tell you how much you need to study; in this case, to just barely score an A, you need a 91.5% on the final.