To find the score you need on a final, use: (target grade − current grade × (1 − final weight)) ÷ final weight. For example, with 85% now and a final worth 20%, you need 60% on the final to finish with an 80%, because (80 − 85 × 0.8) ÷ 0.2 = 60.
How to use the final grade calculator
The calculator has four modes, so it works for every kind of class. Choose the tab that matches your question:
- What do I need on my final? Enter your current grade, the grade you want and how much the final is worth. You get the exact score you need, plus the score needed for every letter grade.
- What will my grade be? Enter the score you expect on the final to see your finished course grade and letter.
- Weighted categories: enter each category from your syllabus (homework, quizzes, midterm, projects) with its weight and your score. The final gets whatever weight is left.
- Points-based class: for classes graded on total points instead of percentages.
- Find your current grade in your school portal (Canvas, PowerSchool, Google Classroom, Blackboard and similar). Use the percentage, not the letter.
- Decide your target. Tap a letter chip (A, B, C…) to fill it in automatically.
- Find the final exam weight in your syllabus, for example "Final exam 20%".
- Pick your grading scale. US standard, US plus/minus, Ontario, BC and Alberta scales are built in.
- Read your result. The table shows the score you need for every grade, so you can set a realistic goal.
The final grade formula
Your course grade is a weighted average: the part of the class you have already finished, plus the final exam. If the final is worth w percent of your grade, everything else is worth (100 − w) percent.
Score needed on final = (Target grade − Current grade × (1 − Final weight)) ÷ Final weight
Use the weight as a decimal: 20% becomes 0.20. The same formula rearranged predicts your final course grade from an expected exam score:
Final course grade = Current grade × (1 − Final weight) + Final exam score × Final weight
Worked example: what do I need for a B?
You have an 85% in the class. The final is worth 20%, and you want at least an 80% (a B).
- Turn the weight into a decimal: 20% = 0.20, so the rest of the class is worth 0.80.
- Points already locked in: 85 × 0.80 = 68.
- Points still needed: 80 − 68 = 12.
- Divide by the final's weight: 12 ÷ 0.20 = 60%.
You need just 60% on the final to keep a B. For an A (90%) you would need (90 − 68) ÷ 0.20 = 110%, which is not possible on a normal exam. The calculator flags that for you.
Worked example: what will my grade be?
Same class: 85% now, final worth 20%. If you score 80% on the final, your course grade is 85 × 0.80 + 80 × 0.20 = 68 + 16 = 84%.
How much does the final exam affect your grade?
The heavier the final, the more it can move your grade, up or down. This table starts from an 85% and shows the finished grade if you ace the final (100%) or have a bad day (50%):
| Final exam weight | Score 100% on final | Score 50% on final | Swing |
|---|---|---|---|
| 10% | 86.5% | 81.5% | 5 points |
| 20% | 88% | 78% | 10 points |
| 25% | 88.75% | 76.25% | 12.5 points |
| 30% | 89.5% | 74.5% | 15 points |
| 40% | 91% | 71% | 20 points |
| 50% | 92.5% | 67.5% | 25 points |
A quick rule: each percentage point you score above or below your current grade on the final moves your course grade by the final's weight. On a 20% final, scoring 10 points above your average lifts your grade by 2 points.
How to calculate your final grade with weighted categories
Most syllabi split your grade into categories. To find what you need on the final, multiply each category score by its weight, add them up, and treat the final as the weight that is left.
| Category | Weight | Your score | Weight × score |
|---|---|---|---|
| Homework | 20% | 92% | 1,840 |
| Quizzes | 15% | 84% | 1,260 |
| Midterm | 25% | 78% | 1,950 |
| Projects | 15% | 88% | 1,320 |
| Total so far | 75% | — | 6,370 |
| Final exam | 25% (what is left) | ? |
- Current weighted average: 6,370 ÷ 75 = 84.9%.
- Needed for 80% (B): (80 × 100 − 6,370) ÷ 25 = 65.2%.
- Needed for 70% (C): (70 × 100 − 6,370) ÷ 25 = 25.2%.
- Needed for 90% (A): (90 × 100 − 6,370) ÷ 25 = 105.2%, which is not possible.
If your categories add up to 100% and there is no separate final, the final exam is already part of one category (often "Tests"). Put the final into that category instead.
Points-based classes
Some teachers grade on total points rather than percentages. Your grade is simply points earned ÷ points possible. To find what you need, work out the total points in the course after the final, multiply by your target percentage, and subtract what you already have.
Example: you have 425 out of 500 points (85%) and the final is worth 200 points, so the course total will be 700. For 80% you need 0.80 × 700 = 560 points, so 135 of 200 on the final (67.5%). For 90% you would need 630 points, or 205 of 200, which is not possible.
How to calculate a semester grade with the final
High schools often weight a semester as two quarters plus a final exam, for example 40% + 40% + 20%. Treat each quarter like a category. With 88% in the first quarter and 82% in the second, your grade before the final is (0.4 × 88 + 0.4 × 82) ÷ 0.8 = 85%. Enter 85% with a 20% final in the calculator to see exactly what you need.
To calculate a semester grade without the final, use the same weighted average of the quarters only. That is the "current grade" you enter in the calculator.
Grading scales: US and Canada
The score you need depends on where your school draws the line for each letter. Check your syllabus; teachers can set their own cut-offs.
| Letter | US standard | US plus/minus | Ontario (level) | British Columbia |
|---|---|---|---|---|
| A / A+ | 90–100% | A 93–100%, A− 90–92% | Level 4: 80–100% | A: 86–100% |
| B | 80–89% | B+ 87–89%, B 83–86%, B− 80–82% | Level 3: 70–79% | B: 73–85% |
| C | 70–79% | C+ 77–79%, C 73–76%, C− 70–72% | Level 2: 60–69% | C+: 67–72%, C: 60–66% |
| D / C− | 60–69% | D+ 67–69%, D 63–66%, D− 60–62% | Level 1: 50–59% | C−: 50–59% |
| Fail | Below 60% | Below 60% | Below 50% | F: below 50% |
High school, college and university
- US high school: finals are commonly 10–25% of a semester grade. Some districts set the weight district-wide; others leave it to the teacher.
- Ontario high school (grades 9–12): under the province's Growing Success policy, 70% of the final mark comes from work during the course and 30% from a final evaluation, which may be an exam, a culminating project or both.
- College and university: finals are often 25–50% of the course grade, and some courses use cumulative finals that can replace a low midterm. Your course outline is the only reliable source.
What if the score I need is over 100%, or negative?
- Over 100%: the target is out of reach with a normal exam. Look at the table for the next grade down, and ask your teacher about extra credit, retakes, or whether the final can replace a low test score.
- 0% or less: you have already secured that grade, even if you score 0 on the final. Most classes still require you to sit the exam, so check the rules before skipping it.
- Between 90% and 100%: possible, but plan your revision early and focus on the topics worth the most marks.
Study plan by the score you need
| Score needed | What it means | Suggested focus |
|---|---|---|
| Under 50% | Comfortable | Review key topics and past papers; protect your grade. |
| 50–75% | Achievable | Revise every unit once, then practise questions on your weakest two. |
| 75–90% | Challenging | Start a week early; do timed past exams; ask your teacher which topics carry the most marks. |
| 90–100% | Very hard | Daily practice, study groups, office hours; consider the next grade as a realistic target. |
Does the final exam affect my GPA?
Only through your course grade. Your GPA uses the final letter or percentage for each course, so the final matters to the extent it changes that letter. On a 4.0 scale, moving from a B (3.0) to an A (4.0) in one course raises a 15-course GPA by about 0.07.
Why your teacher's number might differ slightly
- Rounding: some teachers round 89.5% up to an A; others do not.
- Dropped scores: the lowest quiz or homework may be dropped.
- Curves and extra credit can change the final percentage.
- Categories may be weighted by points rather than percentages in your gradebook.
Key facts
- Required final score = (target − current × (1 − weight)) ÷ weight.
- With an 85% and a 20% final, you need 60% for a B (80%) and 110% for an A (90%).
- On a 20% final, every 10 points above your current grade raises your course grade by 2 points.
- Ontario high schools weight courses 70% term work and 30% final evaluation.
- A result above 100% means the target cannot be reached with a normal exam.
Frequently asked questions
How do you calculate what you need on a final?
Subtract your current grade multiplied by (1 − final weight) from your target, then divide by the final weight. With 85% now, a 20% final and an 80% target: (80 − 68) ÷ 0.2 = 60%.
How are final grades calculated?
As a weighted average. Each category (homework, quizzes, tests, final) is multiplied by its weight and the results are added. If the final is 20%, the rest of the class counts for 80%.
How do I calculate my final grade with weights?
Multiply each category score by its weight, add them, and divide by the total weight so far to get your current grade. The final exam gets the remaining weight. Use the Weighted categories tab to do this automatically.
How do I calculate my semester grade with a final?
Weight each quarter and the final, for example 40% + 40% + 20%. Your semester grade is 0.4 × Q1 + 0.4 × Q2 + 0.2 × final.
Can I calculate my grade without the final?
Yes. Average the categories you have finished, weighted by their share of the course. That is your current grade before the final.
What if I need more than 100% on my final?
The target is not reachable with a normal exam. Look at the next grade down and ask your teacher about extra credit or score-replacement policies.
How much will my final exam affect my grade?
Each point you score above or below your current grade changes your course grade by the final's weight. On a 25% final, scoring 20 points below your average lowers your grade by 5 points.
Is this final grade calculator accurate?
Yes for the standard weighted-average method used by most schools. Your teacher's rounding, dropped scores, curves and extra credit can make the official grade slightly different.
What is a passing grade on a final?
It depends on the course. In US schools, 60% is commonly the minimum passing course grade; in Ontario and BC it is 50%. You may pass the course without passing the final exam itself.
Sources & methodology
Read our full calculation methodology.
News22Times (2026). Final Grade Calculator. Retrieved from https://www.news22times.com/final-grade-calculator/Results are estimates for general information only and are not financial, tax or legal advice. Always confirm with an official source or a qualified professional. See our disclaimer.