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BestGPACalculator
What do I need?

Final Grade Calculator

Tell us your current grade, your target course grade, and how much the final is worth. We'll show exactly what you need on the final — and whether it's realistic.

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Your weighted GPA
4.42
Unweighted: 3.86
APAP Calculus BC
A
HONHonors English
A-
REGChemistry
B+
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You need on the final
108.67%Impossible

You cannot score above 100% — your desired grade is out of reach.

Updated Reviewed by BestGPACalculator Editorial TeamMethodology →

The final grade formula

Definition
Required final score

The score you must earn on your final exam to achieve a specific overall course grade, given the share of the course grade the final represents and your current grade going into the final.

The math is short: required final = (target − current × (1 − weight)) ÷ weight, where the weight is a fraction (e.g. 0.30 for a final worth 30%). The intuition: your current grade is locked in for (1 − weight) share of the course; the final controls the rest.

Formula
(target − current × (1 − w)) ÷ w
Inputs needed
Current grade, target course grade, final weight (%)
Typical final weight
20–40% in US high school, 25–50% in college
Returned as
Percentage score required on the final exam

Worked example

You have a 82% going into the final. You want a 90% in the course. The final is worth 30% of your grade. The required final score is:

(90 − 82 × 0.70) ÷ 0.30
= (90 − 57.4) ÷ 0.30
= 32.6 ÷ 0.30
= 108.67%

That target is impossible from an 82 with a 30%-weighted final — you cannot score over 100%. You would need either extra credit or a lower target (88% is reachable with a 96 on the final).

How to read the feasibility label

  • Already won — you'll hit the target even with a zero on the final.
  • Comfortable / Achievable — realistic with normal preparation.
  • Stretch — possible but requires a strong performance.
  • Very tough — needs near-perfect; unforgiving margin for error.
  • Impossible — over 100% is required; revise the target or earn extra credit.

After the final

Once grades are posted, use the grade calculator to verify your final course percentage matches what your gradebook shows. Then plug the letter grade into the weighted GPA calculator to update your cumulative GPA, or use the GPA goal calculator to plan next term.

Frequently asked questions

How do I calculate what I need on my final?

Use the formula: required final score = (desired course grade − current grade × (1 − final weight)) ÷ final weight. Our calculator does this live — enter your current grade, target grade, and the final's weight as a percentage.

What if the required score is over 100%?

Your target course grade is mathematically unreachable from your current grade given the final's weight. You'll need to either lower your target or earn extra credit if it's offered.

What if the required score is negative or very low?

It means you've already secured your target grade — even a zero on the final keeps you at or above it. The calculator labels this 'Already won.' Still take the final seriously; some schools have minimum final-exam attendance rules.

Where do I find my final exam's weight?

It's on the syllabus, usually labeled 'Final exam' or 'Final assessment' in the grading breakdown. Common ranges: 20–40% in US high school, 25–50% in college. AP-style courses sometimes weight the final higher (30–50%).

Does this work for any course?

Yes — high school, college, AP, IB, online, any course with a final assessment that's worth a fixed share of the total grade. The math is identical.