Weighted Grade Calculator
Enter each category with its weight from your syllabus. You get your grade so far, and the score you need on the final to hit your target — plus the best and worst you can still finish with.
Weighted is not the same as averaging
If homework is 20% of your grade and the final is 40%, a 100 on one homework assignment does not offset a 50 on the final. The final counts twice as much.
The correct calculation multiplies each category score by its weight, adds them, and divides by the total weight used. Averaging the percentages instead — a mistake almost everyone makes at least once — gives a number that can be several points off in either direction.
Check that your weights add to 100
The weight check output exists because syllabi are frequently ambiguous. Participation gets mentioned but never assigned a percentage; a category is dropped mid-semester; the numbers in the syllabus simply do not sum to 100.
If your weights total 95%, every result here is calculated against 95 rather than 100, and your real grade will differ. Sort that out with your instructor before relying on any of this.
The three numbers that actually matter at the end of a term
Points locked in is what you already have, expressed out of 100 for the whole course. This is the number that cannot change no matter what happens on the final.
Best possible is that figure plus the entire final exam weight. If your best possible is 84%, an A is arithmetically out of reach and you can stop spending anxiety on it.
Worst possible equals your locked-in points — what you finish with if you score zero. Students are often surprised that this is higher than they feared. If your worst possible is already a C, the final is about improving your grade, not about survival.
Reading "you need on the final"
Three results are worth interpreting differently.
Above 100% means the target is not reachable through the final alone. The remaining options are extra credit, a dropped lowest score, or a regrade — all of which require talking to your instructor, and all of which get easier the earlier you ask.
At or below 0% means the target is already secured. You could skip the final entirely and still hit it, though attendance policies usually say otherwise.
Between 70 and 100 is the range worth taking seriously. It is achievable but leaves no margin, and it is where most of the useful planning happens.
Where this differs from your real grade
Many courses drop the lowest quiz or homework score, which raises your category average once the semester ends. Some weight the final differently if it helps you. Curves are applied after all of this.
None of that is knowable in advance, so treat the result as your grade under the rules as written. It will usually be slightly conservative.
Frequently asked questions
How do you calculate a weighted grade?
Multiply each category score by its weight, add the results, then divide by the total weight. For example, an 88 on homework worth 20% contributes 17.6 points toward your final 100. Simply averaging the category percentages ignores how much each one counts and gives the wrong answer.
What grade do I need on my final?
Subtract the points you have already locked in from your target grade, then divide by the final exam weight and multiply by 100. This calculator does that for you, and also shows the score needed just to pass at 60 percent.
What if my weights do not add up to 100%?
The calculator flags it. Everything is then computed against the total you entered rather than 100, so your real grade will differ. Common causes are an unlisted participation category or a syllabus that was never updated after a category was dropped — worth clarifying with your instructor.
Why is my calculated grade different from what the school portal shows?
Portals often drop the lowest score in a category, apply a curve, or weight the final differently when it helps you. Those adjustments usually happen at the end of the term and cannot be predicted, so this calculator computes the grade under the rules as written — typically a slightly conservative figure.
Can I still get an A?
Check the "best possible course grade" output, which assumes a perfect score on the final. If it is below 90, an A is out of reach through the final alone, and the remaining options are extra credit or a regrade. Ask early rather than after grades are posted.