What formula does the calculator use?

It solves the weighted-average equation for the final score: needed = (target - current * (1 - w)) / w, where w is the final's weight as a decimal. Your current grade counts for the remaining (1 - w) of the course.

What does it mean if the score needed is over 100%?

It means your target is not reachable with a standard 0-100 final, given your current grade and the final's weight. The tool flags this and you would need extra credit, a curve, or to lower your target.

What if the result is negative or zero?

A result of zero or below means you have already secured your target grade even if you score 0 on the final. The tool tells you the minimum is effectively 0 and you have already passed your goal.

Does my current grade include the final?

No. Enter your grade on everything except the final exam. The calculator combines that with the final using the weights you provide to project the overall course grade.

Is anything uploaded?

No. All math runs in your browser; no grades are sent or stored.

Final Exam Grade Needed Calculator

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Final exam grade needed

Before a final exam it helps to know exactly what score you need to hit your target course grade. This calculator solves the weighted-average equation so you can plan: it tells you the minimum final-exam score required, and warns you if your goal is mathematically out of reach or already locked in.

How it works

Your overall course grade is a weighted average of your current grade and your final-exam score. If the final is worth a fraction w of the grade, your current work is worth 1 - w:

overall = current * (1 - w) + finalScore * w

Setting overall to your target and solving for the final score:

finalScore = (target - current * (1 - w)) / w

For example, with a current grade of 82, a target of 80, and a final worth 30% (w = 0.30):

finalScore = (80 - 82 * 0.70) / 0.30 = (80 - 57.4) / 0.30 = 75.33

So you would need about 75.3% on the final. If the result exceeds 100 it is impossible without extra credit; if it is 0 or below you have already met your goal.

Tips and notes

Enter weights as percentages (for example 30 for a final worth 30% of the grade); the tool converts to a decimal.
The math assumes the final is graded on the same 0-100 scale as your current grade.
If your syllabus drops your lowest score or curves, the real requirement may be lower than shown.