Guide · Plan your final
Final Grade Calculator
Updated: June 2026
"What do I need on the final?" is the most asked question of exam week, and it has a clean answer. Once you know your marks so far and how much the final is worth, a single rearrangement of the weighted average formula tells you the exact score required to land on the grade you want.
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The formula for the grade you need
Start from the weighted average and solve for the one unknown — the final's score. If your existing weighted points are P, your completed weight is W, the final's weight is f, and your target average is T:
In words: work out the total points a grade of T would require across all weight, subtract the points you've already banked, and divide what's left by the weight of the final. The result is the percentage the final must hit.
A step-by-step example
Suppose your course so far is homework 85 (weight 20), midterm 72 (weight 30), and the final is worth 50. You want an 80 overall.
- Banked points:
85×20 + 72×30 = 1700 + 2160 = 3860. - Completed weight:
20 + 30 = 50; final weight 50; total weight 100. - Points an 80 needs:
80 × 100 = 8000. - Final must supply:
8000 − 3860 = 4140points across weight 50. - Score needed:
4140 ÷ 50 = 82.8.
So an 82.8 on the final gets you to an 80 overall. The calculator's "grade still needed" card runs this same arithmetic the moment you enter your target and the final's weight.
Reading the result honestly
The number that comes out tells you more than a target — it tells you whether the target is realistic:
- Between 0 and 100 — a normal, achievable score. Plan your revision around it.
- Above 100 — even a perfect final won't reach your target; you need to lower your goal.
- Below 0 — you've already secured the grade no matter how the final goes. Any score works.
Those two edge cases are the genuinely useful part: they stop you chasing an impossible grade or stressing over one that is already locked in.
If the final is graded out of something other than 100
Keep every value on one scale. If your marks so far are percentages, the needed score comes out as a percentage; convert it to the final's raw points by multiplying by its maximum and dividing by 100. A needed 82.8% on a final worth 150 points is 82.8 × 150 ÷ 100 = 124.2 points. Set the "out of" field in the calculator and it will warn you when the needed score exceeds the maximum.
Frequently asked questions
How do I calculate what I need on my final?
Multiply your target average by the total weight, subtract the weighted points you've already earned, then divide by the final's weight. That is the score the final must reach.
What if the grade needed comes out over 100?
Your target is no longer reachable with the final alone — you'd need better than a perfect score, so lower the target.
What if it comes out negative?
You've already guaranteed the grade. Even a zero on the final keeps you at or above your target.
Does this work for more than one remaining assignment?
Yes — treat the remaining work as a single combined weight, or add each piece as its own row once you know its score.