Education
Final Grade Calculator
Enter your current grade, the grade you're aiming for, and how much the final is worth. It works out the exact score you need on the final — and tells you instantly when the target is already locked in or simply out of reach.
Your numbers
%
Your course grade going into the final
%
The final grade you want to finish with
%
Share of the course grade the final is worth
You need on the final
98%
Reachable
Score 98% on the final to finish the course at 90%.
0% on final100%
Final weight
20%
Locked in
70.4%
Max possible
90.4%
Try an example
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The basics
What “needed on the final” really means
Your course grade is a weighted average. The final exam owns a slice of it; everything else is already settled at your current grade. The score you need on the final is simply whatever it takes for that one slice to drag the average up to your target. Two ideas do all the work.
f = weight ÷ 100
The final is a fraction of the grade
The weight is the share of the course the final is worth. Turn it into a fraction f, and you know exactly how much leverage the final has over your final grade.
20% final → f = 0.20
locked = current × (1 − f)
The rest is already locked in
Everything that isn't the final — the fraction 1 − f — is frozen at your current grade. That banked amount is the head start the final builds on.
88% × 0.80 = 70.4 banked
Method
Work out the score you need by hand
Three steps turn three numbers into the score you need on the final.
- 1
Turn the weight into a fraction
Divide the final's weight by 100 to get f. The rest of the course is the leftover fraction 1 − f.
f = 20 ÷ 100 = 0.20 · 1 − f = 0.80 - 2
Subtract what's already locked in
Multiply your current grade by 1 − f to get the banked amount, then subtract it from your target. That gap is what the final must cover.
90 − (88 × 0.80) = 90 − 70.4 = 19.6 - 3
Divide the gap by the fraction
Divide the gap by f. The result is the score you need on the final — above 100% means out of reach, zero or below means already secured.
19.6 ÷ 0.20 = 98%
Worked examples
The three things that can happen
Every result lands in one of three buckets. Switch between them to see the same formula produce a reachable score, an already-secured target, and an impossible one.
Given current = 88%, target = 90%, final weight = 20%
Fraction: f = 20 ÷ 100 = 0.2
Locked in: 88 × 0.8 = 70.4
Gap to cover: 90 − 70.4 = 19.6
Divide by f: 19.6 ÷ 0.2 = 98
needed = 98%· Reachable
A normal score gets you there — 98% on the final lands the course at exactly 90%.
Quick chart
“What do I need on my final?” at a glance
The fastest answer for the most common cases: pick a target, then read off the score you need for any current grade and final weight. A check means it's already secured; a cross means even a perfect final falls short.
Target course grade
| Current ↓ · Weight → | 10% | 15% | 20% | 25% | 30% | 40% | 50% |
|---|---|---|---|---|---|---|---|
| 95% | 45 | 61.67 | 70 | 75 | 78.33 | 82.5 | 85 |
| 90% | 90 | 90 | 90 | 90 | 90 | 90 | 90 |
| 85% | ✗ | ✗ | ✗ | ✗ | ✗ | 97.5 | 95 |
| 80% | ✗ | ✗ | ✗ | ✗ | ✗ | ✗ | 100 |
| 75% | ✗ | ✗ | ✗ | ✗ | ✗ | ✗ | ✗ |
| 70% | ✗ | ✗ | ✗ | ✗ | ✗ | ✗ | ✗ |
| 65% | ✗ | ✗ | ✗ | ✗ | ✗ | ✗ | ✗ |
| 60% | ✗ | ✗ | ✗ | ✗ | ✗ | ✗ | ✗ |
score needed on the final✓ already secured✗ out of reach
When it matters
Three moments this answers
The same calculation answers very different questions depending on where you sit going into finals week.
needed ≤ current
Defending a grade
You're sitting on a grade you like and want to know the floor — the lowest final score that won't drop you below your target.
needed > current
Closing a gap
You're a little short and want to know how hard you have to push on the final to pull the average up to where you want it.
needed > 100
Knowing when to pivot
The target is gone for this course. Better to learn it now and shift effort to extra credit or another class than to chase an impossible score.
Worth knowing
A few things that trip people up
current excludes the final
Don't double-count the final
Your current grade should be everything graded so far, not a number that already folds in the final. The calculator adds the final on top — including it twice throws the answer off.
enter the pre-final average only
heavier f → more leverage
A heavy final cuts both ways
The bigger the weight, the more the final can rescue a low grade — and the more it can sink a high one. A light final, by contrast, locks your standing in early.
40% final moves the grade 4× a 10% one
rounding lives at the edge
Mind the boundary
When the needed score lands a hair under a round number, your school's rounding policy decides whether it counts. Aim a point higher than the bare minimum to be safe.
89.6% needed → can your school round to 90?
needed ≤ 0 = secured
Already-secured isn't a free pass
A secured target means the grade can't fall below it from the final alone. Many students still sit the final to build a buffer or to clear a higher letter than the minimum.
a 0 keeps the target, but kills a cushion
Reference
The final-grade formula
Everything on this page comes from one weighted-average rearrangement. Your final course grade is current × (1 − f) + final × f; set that equal to your target and solve for the final.
needed = (target − current × (1 − f)) ÷ f
- f
- the final's weight as a fraction (weight ÷ 100)
- current
- your course grade before the final
- target
- the final course grade you want
- needed
- the score the final must earn
A result above 100% means the target can't be reached with this final alone; a result of 0% or below means you've already secured it. A weight of 0% is undefined — a final worth nothing can't change your grade.
FAQ
Common questions
Treat the final as a fraction f of the course (its weight ÷ 100). The rest of the course, (1 − f), is locked in at your current grade. The score you need is needed = (target − current × (1 − f)) ÷ f. With a current grade of 88%, a target of 90%, and a 20% final, that is (90 − 88 × 0.8) ÷ 0.2 = 98%.
A required score above 100% means the target is out of reach with this final alone — even a perfect score would leave you short. You would need extra credit, a different grading scheme, or to lower the target. The calculator flags this case and shows the best grade a perfect final could give you.
A needed score of zero or below means you have already secured the target. The grade locked in by the rest of the course is enough on its own, so even a 0 on the final keeps you at or above your target. You can stop stressing — though most people still aim higher to bank a cushion.
A weight of 0% is rejected because a final that counts for nothing cannot change your grade — the formula would divide by zero. A weight of 100% means the final is the entire grade, so the score you need simply equals your target.
The weight is the share of your overall grade the final is worth. It is converted to a fraction f = weight ÷ 100, which scales how much the final moves your grade. The remaining (1 − f) of the course stays fixed at your current grade — so a heavier final gives you more room to pull the grade up or down.
No. Your current grade should be the average of everything graded so far, not counting the final. The calculator adds the final on top, weighted by its share, so entering a grade that already folds in the final would double-count it.
Set your target to the pass line for your course — often 60% (a D) or 70% (a C). The calculator then shows the lowest final score that keeps you at or above it. The quick chart lists this for common current grades and final weights at a glance.
Because the final's weight f scales how much it can move the grade. A 40% final can shift your course grade far more than a 10% one, so a student sitting below target has a realistic path back when the final carries more weight — and conversely, a light final can lock a grade in early.
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Ugo CharlesBuilt and fact-checked against our editorial standards · Last updated June 2026
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