Set the exact grade you're aiming for and find the final-exam score that gets you there.
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Holding your current grade at 88 and your target at 90, here is what the same equation returns as the final's share of the course changes:
At 10 percent, a 90 overall is not reachable even with a perfect final, since the final barely moves the average. As the weight climbs, the required score drops toward your target itself, because a heavier final has more room to pull the average up on its own.
Your final grade equals your current grade times the portion the final does not cover, plus the final's own score times its weight. Rearranged to isolate the exam score: needed score equals your target minus your current grade times one minus the weight, all divided by the weight.
Worked example. With an 88 current grade, a 90 target, and a final worth 30 percent: the 70 percent already graded contributes 0.70 × 88 = 61.6 points. Reaching 90 overall means the final has to add 90 minus 61.6, or 28.4 points, through its 30 percent share. Divide 28.4 by 0.30 and the final needs about a 94.7 to land the class at exactly 90.
A result over 100 means the target is mathematically out of reach from the final by itself, not a glitch. A result at or below zero means you have already secured that grade regardless of what you score on the final. Neither outcome accounts for extra credit, dropped assignments, or a curve your instructor might apply after the fact.
The final exam calculator solves for a single fixed passing threshold plus a C, B, and A breakdown. This tool solves for whatever one target grade you type in, which is more useful if your goal is a specific number, like keeping a scholarship's 85 percent minimum, rather than just passing.
It means a perfect score on the final is the only way to reach your stated target exactly. Anything below 100 on the final would land you just under your goal.
Yes. Enter any target percentage, 87, 91.5, whatever number you actually need, since the calculator solves the same equation regardless of whether that number lines up with a standard letter-grade boundary.
Yes. The Copy link button encodes your current grade, target grade, and the final's weight into the address, so whoever opens it, an advisor or a study group, sees the identical scenario you were looking at.