Final Grade Needed Calculator
Free "what do I need on the final?" calculator — enter your current grade, final exam weight and target overall to see the score required.
Enter your current grade, the weight of the final exam (as %), and the overall grade you’re aiming for. The calculator returns the score you need on the final.
The formula
Your overall grade is a weighted average of two things — what you’ve done so far, and the final:
target = current × (1 − w) + final × w
where w is the final’s weight as a fraction (30% → 0.30). Solve for
the final:
final = (target − current × (1 − w)) ÷ w
So with a current 80, a final worth 30%, aiming for an 85:
final = (85 − 80 × 0.70) ÷ 0.30 = (85 − 56) ÷ 0.30 = 96.67
”Need over 100” / “need under 0”
The math doesn’t care about grade caps; real grading does. If the formula returns:
- above 100 — the target is unreachable with that final
weight, even with a perfect final. Either lower the target or
accept the max you can hit (
current × (1 − w) + 100 × w). - below 0 — you’re already there. Even a zero on the final leaves you at or above the target.
Single final assumed
This calculator assumes one remaining graded item with a known weight. If you have multiple pending assignments, model them with the weighted-average calculator instead.
Worked examples
-
Current 80, final 30%, target 85
You need 96.67 on the final to reach 85.
-
Current 70, final 50%, target 75
You need 80 on the final to reach 75.
-
Unreachable: current 50, final 20%, target 85
Out of reach: you'd need 225 on the final (over 100).
Frequently asked questions
What's the formula?
target = current × (1 − w) + final × w, where w is the final's weight (e.g. 30% = 0.30). Solving for the final gives: final = (target − current × (1 − w)) ÷ w. The calculator does this and flags unreachable / already-achieved cases.
What does \"weight\" mean here?
The portion of your overall grade that comes from the final exam, as a percentage. If the syllabus says "final is worth 30%", use 30. Coursework / quizzes / homework collectively make up 100 − weight%.
What if the calculator says the needed grade is over 100?
It's flagged as out of reach. With the given final weight, your current grade is too low to recover to the target. Either lower the target, or accept that the maximum overall is current × (1 − w) + 100 × w.
What if it's below 0?
Then you're already certain to clear the target — even a zero on the final still leaves you at or above the target. The calculator notes this so you can rest easy (or aim higher).
Does this assume a single final exam?
Yes — this calculator assumes one remaining graded item with a known weight. If multiple things are still pending, use the weighted average calculator with placeholders for the future items.
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