How do I calculate what I need on my final exam?

Use needed = (target − current × (1 − w)) ÷ w, with every grade as a percentage and w the final's weight as a fraction. Your current grade covers (1 − w) of the course, so it contributes current × (1 − w) points. The final has to supply the rest of the target, and it only counts for w of the grade, so you divide by w. With 84% now, a final worth 25% and a target of 80%: 84 × 0.75 = 63, 80 − 63 = 17, 17 ÷ 0.25 = 68%.

What does it mean if the score I need is above 100%?

It means the final alone cannot get you to that grade. With 84% now and a final worth 25%, a goal of 90% needs 108%; a perfect score would still leave you at 88%. Lower the goal, or check whether extra credit or other graded work remains. The calculator says "not reachable" instead of showing the number as a plan.

What if the score I need is zero or negative?

Then the grade is already secured: even a 0% on the final leaves you at or above the goal. With 84% now and a final worth 25%, a goal of 60% shows "Already secured: no minimum score needed on the final", because 84 × 0.75 = 63% already beats it. Courses can add rules, such as needing a minimum score on the final to pass, so check the syllabus before skipping the exam.

How do I use weighted categories?

Switch to weighted categories, then enter each category's weight and your score so far, such as homework, quizzes and a midterm. The current grade is the sum of weight × score divided by the sum of weights. Tests at 60% weight with 80% and homework at 40% weight with 95% give 86%. Leave out categories with no grades yet: they have nothing to average.

What if my category weights don't add up to 100?

The calculator divides by the total, so the weights act as shares of the work graded so far. Weights of 3 and 1 with scores 70% and 90% give (3 × 70 + 1 × 90) ÷ 4 = 75%, the same as weights of 75 and 25. This is what you want when the categories cover only what is graded so far (the example's weights add up to 75 because the final is the other 25). Enter the final's weight separately, not as a category.

Why is the score rounded up?

Rounding to the nearest value could leave you a hair short. A current grade of 80%, a final worth 30% and a goal of 85% needs 96.666…%, which is shown as 96.67%, so the number you aim for is always enough. Your instructor may round final grades differently (for example, up from 89.5), which can lower what you need in practice. Check your course's rule.

Are 90, 80, 70 and 60 the cut-offs for A, B, C and D?

They are a common scale, not a universal one. Some schools and courses start an A at 93, add plus and minus grades, or curve the results. The quick pick buttons only fill the target with 90%, 80%, 70%, 60%; you can type any percentage, such as 92.5, for your own cut-off.

Does this work if the final replaces my lowest test, or is dropped or curved?

No: it assumes the final is one more weighted part of the grade and everything else keeps its score. If your syllabus lets the final replace a lower exam score, drops your lowest grade, or curves the course, treat the result as an estimate and recompute with the replaced score, or ask your instructor.

How do I get from this to my GPA?

Once you know the grade you can reach in the course, turn it into a letter and enter it in the GPA calculator (linked under Related tools) with its credits to see the effect on your term or cumulative GPA.

Is anything I type stored or sent anywhere?

No. The calculation runs in your browser and nothing you type is saved or sent. The page only counts that the calculator was used, never what you entered.

Final Grade Calculator

The score you need on the final is (target − current × (1 − w)) ÷ w, where w is the final's weight as a fraction of the course. With 84% now, a final worth 25% and a goal of 80%, that is (80 − 84 × 0.75) ÷ 0.25 = 68%. Enter your current grade (or build it from weighted categories), the final's weight and the grade you want, or pick a letter. If the answer is above 100% the final alone cannot get you there, and if it is 0% or less the grade is already secured. Letter cut-offs of 90, 80, 70 and 60 are a common scale, not a universal one: check your syllabus.

Updated 2026-10-08Runs in your browser: nothing you enter is uploadedHow this tool works

Enter your grade so far, how much the final exam is worth and the overall grade you want. All values are percentages.

Current grade from

Current grade (%)

Final exam weight (%)

Desired overall grade (%)

Quick pick a letter

A common scale (90, 80, 70, 60), not a universal one: check your syllabus.

You need 68% on the final

to finish with 80% overall, with the final worth 25% and 84% in the rest of the course.

Score needed on the final: 68%
Current grade: 84%
Weight of the final: 25%
Desired overall grade: 80%
Overall with 0% on the final: 63%
Overall with 100% on the final: 88%

Final needed for each letter grade

Score needed on the final for each letter, using the common 90, 80, 70 and 60 cut-offs
Letter	Overall grade	Final needed	What it means
A	90%	108%	Not reachable with the final alone (above 100%)
B	80%	68%	Reachable
C	70%	28%	Reachable
D	60%	None	Already secured, even with 0% on the final

The working

The final is worth 25%, so the rest of the course is worth 75%.
Your current 84% counts for 75%: 84 × 0.75 = 63 points of the overall grade.
You want 80%, so the final must supply 80 − 63 = 17 points.
Those points come from the final's 25%: 17 ÷ 0.25 = 68%.

Final exam score needed for each letter grade

For the example above (84% now, final worth 25%). The cut-offs are a common scale, not a universal one: some courses and schools use different ones.
Letter	Overall grade needed	Score needed on the final	What it means
A	90%	108%	Not reachable with the final alone (above 100%)
B	80%	68%	Reachable
C	70%	28%	Reachable
D	60%	None	Already secured, even with 0% on the final

How the final exam weight changes the score you need

Current grade 84%, goal 80%. The heavier the final, the closer the score you need gets to the grade you want.
Weight of the final	Rest of the course	Score needed for 80%
10%	90%	44%
20%	80%	64%
25%	75%	68%
30%	70%	70.67%
40%	60%	74%
50%	50%	76%

Current grade from weighted categories: the example

The weights add up to 75, not 100, so each is divided by 75. The current grade is about 83.53%.
Category	Weight	Score	Share of current grade
Homework	20	92%	about 26.67%
Quizzes	15	85%	20%
Midterm	25	78%	about 33.33%
Project	15	80%	20%

How to find the score you need on the final

Enter your current grade. Type the percentage you have now, before the final. 84% is the example loaded above. If you only know your scores by category, switch to weighted categories and enter each category's weight and score instead.
Enter the final exam's weight. Type how much of the course grade the final is worth, from your syllabus. In the example it is 25%, so everything else is worth 75%.
Choose the grade you want. Type a percentage, or press A, B, C or D for the common cut-offs of 90, 80, 70 and 60. Check your syllabus: your course may use different cut-offs.
Read the score you need. The result is the minimum score on the final that reaches your goal: 68% for the example. The working under the result shows each step.
Compare the other letters. The table lists the score needed for an A, B, C and D at once, so you can see what is out of reach (A needs 108% in the example) and what is already secured.

Frequently asked questions

How do I calculate what I need on my final exam?: Use needed = (target − current × (1 − w)) ÷ w, with every grade as a percentage and w the final's weight as a fraction. Your current grade covers (1 − w) of the course, so it contributes current × (1 − w) points. The final has to supply the rest of the target, and it only counts for w of the grade, so you divide by w. With 84% now, a final worth 25% and a target of 80%: 84 × 0.75 = 63, 80 − 63 = 17, 17 ÷ 0.25 = 68%.
What does it mean if the score I need is above 100%?: It means the final alone cannot get you to that grade. With 84% now and a final worth 25%, a goal of 90% needs 108%; a perfect score would still leave you at 88%. Lower the goal, or check whether extra credit or other graded work remains. The calculator says "not reachable" instead of showing the number as a plan.
What if the score I need is zero or negative?: Then the grade is already secured: even a 0% on the final leaves you at or above the goal. With 84% now and a final worth 25%, a goal of 60% shows "Already secured: no minimum score needed on the final", because 84 × 0.75 = 63% already beats it. Courses can add rules, such as needing a minimum score on the final to pass, so check the syllabus before skipping the exam.
How do I use weighted categories?: Switch to weighted categories, then enter each category's weight and your score so far, such as homework, quizzes and a midterm. The current grade is the sum of weight × score divided by the sum of weights. Tests at 60% weight with 80% and homework at 40% weight with 95% give 86%. Leave out categories with no grades yet: they have nothing to average.
What if my category weights don't add up to 100?: The calculator divides by the total, so the weights act as shares of the work graded so far. Weights of 3 and 1 with scores 70% and 90% give (3 × 70 + 1 × 90) ÷ 4 = 75%, the same as weights of 75 and 25. This is what you want when the categories cover only what is graded so far (the example's weights add up to 75 because the final is the other 25). Enter the final's weight separately, not as a category.
Why is the score rounded up?: Rounding to the nearest value could leave you a hair short. A current grade of 80%, a final worth 30% and a goal of 85% needs 96.666…%, which is shown as 96.67%, so the number you aim for is always enough. Your instructor may round final grades differently (for example, up from 89.5), which can lower what you need in practice. Check your course's rule.
Are 90, 80, 70 and 60 the cut-offs for A, B, C and D?: They are a common scale, not a universal one. Some schools and courses start an A at 93, add plus and minus grades, or curve the results. The quick pick buttons only fill the target with 90%, 80%, 70%, 60%; you can type any percentage, such as 92.5, for your own cut-off.
Does this work if the final replaces my lowest test, or is dropped or curved?: No: it assumes the final is one more weighted part of the grade and everything else keeps its score. If your syllabus lets the final replace a lower exam score, drops your lowest grade, or curves the course, treat the result as an estimate and recompute with the replaced score, or ask your instructor.
How do I get from this to my GPA?: Once you know the grade you can reach in the course, turn it into a letter and enter it in the GPA calculator (linked under Related tools) with its credits to see the effect on your term or cumulative GPA.
Is anything I type stored or sent anywhere?: No. The calculation runs in your browser and nothing you type is saved or sent. The page only counts that the calculator was used, never what you entered.

How it works

The overall grade is current × (1 − w) + final × w, where current is your grade so far as a percentage, final is your score on the exam and w is the final's weight divided by 100. Solving for the final gives (target − current × (1 − w)) ÷ w, which the calculator evaluates as (100 × target − current × (100 − weight)) ÷ weight using exact fractions, so a weight of 12.5 or a score of 87.5 never picks up floating-point error. The score needed is rounded up to two decimals so it is always enough. A result above 100 is reported as not reachable with the final alone, and a result of 0 or less as already secured. In weighted categories mode the current grade is the sum of each category's weight × score divided by the sum of the weights, so weights that do not add up to 100 are rescaled to shares; empty rows are skipped, and a row with only a weight or only a score is flagged. Weights must be above 0, the final's weight must be at most 100, and scores and goals up to 200% are accepted so extra credit works. The letter quick picks use the common 90, 80, 70 and 60 cut-offs, which differ between schools and courses. The calculator assumes the final is one more weighted component and does not model dropped grades, replaced scores, curves or minimum-score rules. Nothing you type is stored or sent anywhere.

Sources

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