School
Final grade calculator
Enter your current grade, the course grade you want, and how much the final counts. You get the final exam score you need.
What this means
- To finish with 90%, you need 108.0% on a final worth 25%.
- Even a perfect final gives 88.0%. Ask about extra credit or aim for a nearer target.
What if
About this calculator
What this calculator does
It splits your course grade into the part already earned and the part the final decides, then solves for the final score.
How it is calculated
target = current * (1 - w) + final * w
final = (target - current * (1 - w)) / w
w is the final's weight as a decimal, so 25% is 0.25.
How to read the result
The score needed is a percent on the final. Above 100% means the target cannot be reached without extra credit. Zero or below means you have it already.
Sources and method
Standard arithmetic with no outside data. The formula is shown under How it is calculated, and unit tests check worked examples, including edge cases.
This page uses arithmetic only, with no outside data.
Questions
What if my class uses points, not percents?
Convert first: your points earned divided by points possible so far is your current grade.
What does a negative result mean?
You will reach the target even with a zero on the final.
What if the final replaces a low test score?
This page assumes a simple weighted final. Ask your teacher how replacements work.
Does it work for any letter grade?
Yes. Enter the percent your school uses for that letter as the target.