Extra Credit Calculator
Your weighted total as it stands now.
What that category is worth in the course.
Points on the same scale the category already uses.
What each letter would take
For the grade and mode entered above, here is how many extra credit points each common letter minimum would need.
| Target letter | Common minimum | Points needed | Verdict |
|---|
How the math works
A weighted course grade is the sum of each category's average times its weight. Extra credit lands in one of two places, and the difference is the whole question.
Inside a category. The points move that category's average, and the category moves the course total in proportion to its weight:
delta = points × weight ÷ 100
So 5 points into a category worth 20% of the course is worth 1.0 of final grade. A course grade of 87% becomes 88.0%.
On the total. Some syllabi add extra credit after the weighting is done. Then the category is irrelevant:
delta = points
The same 5 points now move 87% to 92.0% — five times as far. That gap is why the mode selector is the first control on this page rather than a footnote.
Two edge states the tool says out loud rather than hiding. A category worth 0% cannot move your grade no matter how many points you earn in it. And when the points on offer cannot reach the next letter, the tool tells you how many more it would take, in the same units the offer is made in.
Questions
Why is 5 points of extra credit not 5 points of grade?
Because it usually lands inside one category, and that category is only part of the course. Points inside a category worth 20% are diluted to a fifth of their face value: 5 points becomes 1.0 of final grade. Only when extra credit is added to the finished total, or when the category is the entire course, do the two numbers match.
Which mode does my class use?
The tool cannot know, and it does not guess. Check your syllabus for whether extra credit is added to a category or to the final percentage; if it does not say, ask. The two modes are offered side by side because the answer changes the result by a factor equal to the category's weight.
What if the category is worth 0%?
Then nothing you earn in it can change your course grade, and the tool says so plainly instead of returning a number. This is a real syllabus pattern for ungraded practice work.
Does the letter table change my grading scale?
No. The table uses one common convention (A = 93, A- = 90, and so on) to show what each boundary would take. The percent field is the source of truth, and your syllabus's own scale always wins.
Can extra credit take me above 100%?
The arithmetic here allows it, because some courses do. Whether your school caps a course grade at 100% is a policy question this page cannot answer; check your syllabus.