Grade Calculator
What you need on the final for an A, a B, a C and a D, all at once, and the best and worst grade you can still finish with.
Updated 30 October 2026.
Grade Calculator is a free tool that works out what you need on your final for every letter grade at once, your grade so far from weighted categories or total points, and the best and worst grade you can still finish the class with. Type scores as percentages or as points like 45/50.
- Every letter in one look. No picking a target and starting again.
- Your range. What a perfect final and a zero would each leave you with.
- The gradebook catch. What happens when a category with no grades yet starts to count.
Whatever you type here is not saved or sent anywhere. We never see it, and it is gone when you close the page. One class at a time; this is not a GPA calculator.
To finish with a B
Example: what you need on the final exam, with 86% so far and the final worth 25%.
What you need for each letter
The score you need on what is left, letter by letter. Anything above the red line would take more than 100%.
RUNG BARS · ONE RUNG = FIVE PERCENTAGE POINTS
| Letter | Starts at | You need |
|---|
The final grade formula, worked through
Your course grade is a weighted average. Everything graded so far has already banked part of it, and the final decides the rest. So the score you need is the gap between the grade you want and what you have banked, divided by what the final is worth:
needed on the final = (grade you want − grade so far × (1 − final weight)) ÷ final weight
Say you have 86% going into a final worth 25%. The other 75% of the course is settled at 86%, which banks 64.5 points. A B starts at 80, so the final has to supply 15.5 points out of the 25 it is worth: 15.5 ÷ 0.25 = 62%. An A needs 25.5 of the 25 points available, which is 102%, so it is out of reach without extra credit.
Two numbers frame every case. A zero on the final leaves you at the points already banked, 64.5%. A perfect final adds all 25, for 89.5%. Every possible result sits between them, and the slider above moves through that range.
Why the grade in your gradebook can mislead you
Most online gradebooks average only the categories that have something in them. If tests are worth 35% and none has been graded yet, the grade you see is built from homework and quizzes alone, and it can look far better or worse than where the class is really heading. The first test score moves it a long way, which is why grades sometimes drop overnight without anything going wrong.
Leave a category's score empty here and the calculator does the same as the gradebook, then shows what the grade becomes if that category counts as zero. Both are true at the moment; only one of them is where you will end up if nothing is handed in.
This is arithmetic on the numbers you type. Curves, extra credit, dropped scores and rounding are up to your teacher, and the syllabus is the place to check.
How to fill this in
Find the grading breakdown in your syllabus. It usually lists categories like homework, quizzes, tests and the final, each with a percentage. Enter one row per category with its weight and your average in it. If your teacher posts points instead of percentages, type them as 45/50 and the calculator converts them.
Leave the final's score empty until you have sat it. If something else is still to be graded, a last project for example, add it as a category and leave its score empty too: the answer then becomes the average you need across everything still open.
If all you know is your current grade, choose I know my grade so far and enter it with the final's weight. If your class just adds up points, choose Total points and enter the points possible and the points earned for each part.
Then pick the grade you want above the answer. The big number is for that letter; the row beneath it has every letter at once.
The Grade Calculator above answers one class, today. Keeping every class's deadlines and weights in one place all semester is what the tracker is for.
Student Assignment Tracker
One list of every assignment with its class, weight and due date. The weighted grade for each class updates as marks come in, and a semester view shows which week is about to become a problem, for up to 12 classes in Excel and Google Sheets.
Student Assignment Tracker, $2.69 on Etsy → What is inside it
Related
For keeping on top of the work that decides these numbers, the Task Tracker holds tasks, recurring jobs and a Gantt in one file. Both templates, and the rest of the planning range, are on the Productivity & Planning page. And if you are working while you study, the Time Card Calculator totals your hours with breaks.
Questions people ask
How do I work out what I need on my final?
Take the grade you want, subtract what you have already banked, and divide by how much the final is worth. With 86% so far and a final worth 25%, a B (80%) needs (80 minus 86 times 0.75) divided by 0.25, which is 62%. The calculator does the same sum for every letter at once.
What does it mean if I need more than 100%?
That letter is out of reach on what is left. The calculator says so plainly and shows the best grade still possible, which is what 100% on everything left would give you. Extra credit or a curve can change that, and only your teacher can say whether either is on offer.
How are weighted grades calculated?
Each category's average is multiplied by its weight, and the results are added up. Homework at 94% worth 20% contributes 18.8 points; tests at 81% worth 35% contribute 28.35. If the weights do not add up to 100, the calculator divides by what they do add up to and tells you.
My class uses total points. Does that work?
Yes. Choose By points and enter the points possible and the points you earned for each category. In a points class a category's weight is simply how many points it is worth, so the arithmetic is the same.
Why did my grade drop when a new category got its first grade?
Most gradebooks average only the categories that have grades in them. Until the first test is entered, a test category worth 35% is left out entirely, so the grade you see is built from homework and quizzes alone. When the tests arrive the grade can move a long way. The calculator shows the gradebook figure and what it becomes if an empty category counts as zero.
Does 89.5% round up to an A?
Only if your teacher or school says so. Some round to the nearest whole number, many do not. This calculator does not round: 89.99% is a B when an A starts at 90. If your syllabus rounds, set the A cutoff to 89.5.
Is this the same as a GPA calculator?
No. This works out one course from its categories. A GPA averages the letter grades of all your courses, usually weighted by credit hours. This page does not calculate GPA.
Is a final grade calculator accurate?
The arithmetic is exact. The answer is only as right as the weights and scores you type, and most mismatches with a teacher's figure come from four places:
- A weight copied wrong, or weights that do not add up to 100%. The calculator warns you when they do not.
- A category with nothing graded yet. Your gradebook ignores it; your final grade will not.
- Dropped lowest scores, a curve, or rounding, which only your teacher applies.
- A class graded on points, entered as weights. Choose Total points if your syllabus lists points.
How do I add extra credit?
Type it into the score of the category it counts toward. Extra credit that lifts a quiz average to 104% goes in as 104, and 52 points out of 50 goes in as 52/50.
The calculator counts a score over 100% exactly as typed and flags it, so you can see it is there. Extra credit that your teacher adds to the final course grade instead is not something this can know about.
How do I work out my semester grade from quarter grades?
Treat each quarter as a category with its weight. A common split is 40% for each quarter and 20% for the semester exam.
With 88% in the first quarter and 82% in the second, the two quarters bank 35.2 and 32.8 points, 68 in all. A B at 80 needs 12 more of the exam's 20 points, so 60% on the exam. An A at 90 needs 22 of the 20, which is out of reach.
Schools split this differently, so take the weights from your school's grading policy.
Can I calculate my grade by points instead of percentages?
Yes. Choose Total points and enter the points possible and earned for each part. Your grade is points earned divided by points possible.
With 412 of 470 points so far you are at 87.7%. If the final is worth 100 points, the class totals 570, so a B at 80% needs 456 points overall: 44 or more on the final.