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Use your own numbers after reviewing the example below.
Quick answer
A final worth 25% leaves 75% of the course grade represented by your current average.
Formula or method
Needed final = (target − current × 0.75) ÷ 0.25
Step-by-step
- Multiply your current grade by 0.75.
- Subtract that amount from the target.
- Divide by 0.25.
Worked example
Current grade 82%, target 85%: (85 − 82 × 0.75) ÷ 0.25 = 94% needed on the final.
How to interpret the result
Because the exam is one quarter of the total grade, every 4 points on the final changes the overall course grade by about 1 point relative to a zero baseline.
Common mistakes
- Mixing percentage points and percentages.
- Entering the exam weight as 0.25 when the calculator expects 25.
- Using a gradebook average that does not match the syllabus weights.
Frequently asked questions
What do I need from 82% to 85% with a 25% final?
94%.
What if my target is 80%?
Use 80 as the target; the exact needed score depends on the current grade.
Can I use this for a midterm?
Yes, if the remaining assessment has a known 25% weight and the current grade represents the other 75%.