Near the end of every term, one question dominates student life: what do I need on the final to get the grade I want? The final-grade calculator answers it with a single formula. If your coursework so far averages a certain score and counts for a certain weight, and the final exam counts for the rest, then: required final score = (target grade - current average x coursework weight) / final weight. All values are percentages expressed as decimals for the weights — a final worth 30 percent uses 0.30. The formula is just the weighted-average equation solved for the unknown, which means it is exact, not an estimate.
Reading the answer correctly matters as much as computing it. If the required score is above 100 percent, your target is mathematically impossible — no perfect paper can get you there, so either lower the target or check whether extra credit exists. If it is negative, you have already secured your target and could score zero on the final and still pass (though showing up is still wise). If it lands between 0 and 100, that is your concrete study target: a required 85 percent means something very different from a required 62 percent, and knowing which one you face focuses your revision enormously.
A few fine points: the 'current average' must itself be the weighted average of everything so far if your coursework has internal weights — do not just average the raw scores. Confirm the final's true weight from the syllabus, since some courses fold the final into a broader 'exams' category. And remember that many instructors curve or drop the lowest score, which the basic formula does not model — treat the result as the uncurved requirement, then ask about policies that might help.