About this tool
The Final Grade Calculator tells you exactly what score you need on your final exam to reach your target overall grade. Enter your current grade, the final exam's weight, and your target - the tool shows the required final score plus a table of letter grade outcomes.
About the final grade calculator
A final grade calculator answers one specific question: what score do I need on the final exam to finish the course with the overall grade I want? It works backwards from your target. You supply three numbers, your current grade so far, the percentage weight the final exam carries, and the overall grade you are aiming for, and the tool solves for the exam score that closes the gap.
This is more useful than a running average because it accounts for the fact that the final usually counts for a fixed slice of the total, often 20 to 50 percent. Knowing you need 78 percent rather than 95 percent changes how you plan your revision. The calculator also prints a full table of letter-grade targets so you can see, at a glance, the exam score required for an A, a B, and so on.
How it works: the formula
Your overall grade is a weighted average of coursework and the final. Rearranging that average to solve for the final score gives the formula below.
Overall = Current x (1 - Weight) + Final x Weight Solve for the final score you need: Required Final = (Target - Current x (1 - Weight)) / Weight where: Current = grade earned so far, as a percent Weight = final exam's share of the grade, as a decimal (40% = 0.40) Target = overall grade you want, as a percent
If the result exceeds 100, the target is out of reach; if it is below 0, you have already secured the target regardless of the exam.
Worked example
Say you currently sit at 80 percent, the final is worth 40 percent of the course, and you want to finish with an 85 percent overall.
- Weight as a decimal: 40 percent becomes 0.40, so coursework is the other 0.60.
- Coursework contribution: 80 x 0.60 = 48 percentage points already locked in.
- Points the final must supply: 85 minus 48 = 37 points.
- Divide by the weight: 37 / 0.40 = 92.5.
Required final by target (80% current, 40% weight)
How the required exam score changes with your overall target, holding the example inputs fixed.
| Target overall | Letter (US) | Required on final |
|---|---|---|
| 70% | C- | 55.0% |
| 80% | B- | 80.0% |
| 85% | B | 92.5% |
| 88% | B+ | 100.0% |
| 90% | A- | 105% (impossible) |
Common pitfalls
- Entering the weight as a percent of coursework. The weight field is the final exam's share of the whole grade, not the share of remaining work.
- Using a projected current grade. Enter what you have actually earned so far. Including an assumed exam score double-counts the final.
- Ignoring impossible results. A required score over 100 percent is a signal to reset the target, not a rounding quirk.
- Forgetting minimum-exam rules. Some courses require a minimum final score to pass regardless of coursework, which the pure weighted average does not capture.
- Mixing percentage and points systems. The formula assumes everything is on a 0 to 100 percent scale. Convert raw points to percentages first.
- Treating the result as a guarantee. It tells you the score needed, not the score you will get. Use it to plan revision effort, not to relax.
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Frequently asked questions
How is the required final grade calculated?
Required final = (Target minus Current times (1 minus Weight)) divided by Weight, where Weight is the final exam's share written as a decimal. For example, with an 80 percent current grade, a final worth 40 percent, and an 85 percent target: (85 minus 80 times 0.6) divided by 0.4 equals 92.5 percent needed on the final.
What does the final exam weight mean?
The weight is the percentage of your overall grade that the final exam is worth, as set out in the syllabus. If the final counts for 40 percent, then your existing coursework accounts for the other 60 percent. The current grade you enter should reflect everything you have earned so far across that remaining 60 percent.
What if the required grade is over 100 percent?
A result above 100 percent means the target is mathematically impossible given your current grade and the final's weight, even with a perfect exam. The fix is to lower the target, or to recognise that extra credit (if your course offers it) is the only path to that grade.
Can the calculator show I have already passed?
Yes. If the required score comes out below zero, it means your current grade and coursework already guarantee the target even if you scored zero on the final. The tool flags this as already achieved, though you should still confirm your course has no minimum-exam-score rule.
Are my grades sent anywhere?
No. The calculation runs entirely in your browser using JavaScript. The grades you type are never uploaded, logged, or stored on a server, and they disappear when you close the tab.