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Calculation:

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 C =
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Current Course Grade (%)

Your current weighted course grade before the final exam, expressed as a percentage.
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 W =
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Final Exam Weight (%)

How much of the total course grade the final exam is worth. Enter the weight as a percent of the course.
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 T =
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Target Course Grade (%)

The overall course grade that you want to finish with after the final exam.
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 R =
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Required Final Exam Grade (%)

The grade needed on the final exam to reach the target course grade.
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 B =
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Best Possible Course Grade (%)

Highest course grade possible if the final exam score is 100%.
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 S =
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Result Status

Quick interpretation of the required final exam grade.
Decimals

Choose the number of decimals to show in your answer. This is also known as significant figures. Select an appropriate amount of significant figures based on the precision of the input numbers.

Formula

This calculator answers a common school question: what grade do I need on my final exam to finish the course with my target mark?

If the current course grade is C, the target course grade is T, and the final exam is worth W percent of the course, the required final exam grade R can be calculated with the weighted-grade formula below.

R = (T - C(1 - W / 100)) / (W / 100)

The same weighted-average structure can also be used to find the best possible final course grade by substituting a final exam score of 100%.

Variables

To calculate the grade required on a final exam you need three pieces of information: your current course grade, the weight of the final exam, and the overall grade you want in the course.

Current Course Grade (C): Your current weighted grade in the course before the final exam has been added.
Final Exam Weight (W): The percent of the total course grade that comes from the final exam. For example, a final worth 30% should be entered as 30.
Target Course Grade (T): The final overall course grade you want after the final exam is included.
Required Final Exam Grade (R): The score needed on the final exam to finish the course at the target grade.
Best Possible Course Grade (B): The highest course grade possible if the final exam score is 100%.
Result Status (S): A short note explaining whether the target is already secured, still achievable, or out of reach without extra credit.

How to Calculate Requirement

Suppose a student has a current course grade of 84%, the final exam is worth 30% of the course, and the target overall course grade is 88%. What grade is needed on the final?

R = (T - C(1 - W / 100)) / (W / 100)
R = (88 - 84(1 - 30 / 100)) / (30 / 100)
R = (88 - 84(0.70)) / 0.30
R = (88 - 58.8) / 0.30
R = 29.2 / 0.30
R = 97.33%

A student with an 84% current course grade and a final worth 30% would need about 97.33% on the final exam to finish with an 88% course grade.

Example When the Target Is Too High

If the current course grade is 84%, the final exam is worth 25%, and the target course grade is 90%, the required final exam grade is above 100%.

R = (T - C(1 - W / 100)) / (W / 100)
R = (90 - 84(1 - 25 / 100)) / (25 / 100)
R = (90 - 84(0.75)) / 0.25
R = (90 - 63) / 0.25
R = 27 / 0.25
R = 108%

An answer above 100% means that the target grade is not reachable under the current weighting unless extra credit or some other adjustment is available.

What Does the Answer Mean?

If the required final exam grade is between 0% and 100%, the target is still achievable. If the answer is exactly 100%, a perfect final exam score is required. If the answer is greater than 100%, the target is out of reach without extra credit. If the formula produces a value below 0%, the target has already been secured before the final exam and the calculator reports that status directly.

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