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Grade Calculator – What Do I Need on My Final?

Find the score you need on your final exam to finish a course with the grade you want, or calculate your weighted grade so far from homework, quizzes, tests and projects. See a table of the final score needed for every letter grade.

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How to use the grade calculator

To find the final exam score you need:

  1. Choose Final exam score needed.
  2. Enter your current grade in the course.
  3. Enter how much the final exam is worth as a percentage of the total grade.
  4. Enter the grade you want to finish with.

To work out your weighted grade:

  1. Choose Weighted grade.
  2. List each assignment or category on its own line as name, score %, weight %.

The formulas

Final exam score needed

Needed = (Target − Current × (1 − w)) ÷ w

where w is the final’s weight as a decimal (30% = 0.3).

Weighted grade

Grade = Σ (score × weight) ÷ Σ weight

Worked example: final exam

Your current grade is 84%, the final is worth 30%, and you want 85%:

  • Needed = (85 − 84 × 0.7) ÷ 0.3 = (85 − 58.8) ÷ 0.3 = 87.33%

To get a 90% you’d need (90 − 58.8) ÷ 0.3 = 104%, so an A- isn’t possible without extra credit — but a B+ (87%) needs (87 − 58.8) ÷ 0.3 = 94%.

Worked example: weighted grade

ItemScoreWeight
Homework92%20%
Quizzes85%15%
Midterm78%25%
Project95%10%

Weighted grade = (92 × 20 + 85 × 15 + 78 × 25 + 95 × 10) ÷ 70 = 6,015 ÷ 70 = 85.93% (B), with 70% of the course graded.

Planning for your final

  • Know the stakes. If the final is worth a lot, a few extra points make a real difference.
  • Check the table to see which grades are realistic and which are already secured.
  • Ask about extra credit or drops — some courses drop the lowest quiz or homework score.
  • Start revising early and focus on the topics with the most marks.

Why the final can matter so much

The weight of the final decides how much it can move your grade. If it is worth 10%, even a perfect score adds only a few points; if it is worth 40% or 50%, one exam can lift or sink the whole course. Knowing this early helps you decide where to spend revision time across all your subjects — sometimes it is smarter to secure a safe grade in one course and put extra effort into another where the final carries more weight.

Points-based courses

If your course uses points rather than percentages (for example 450 out of 500 points), divide your points by the total possible to get your percentage, then use the calculator. The percentage calculator does that division for you.

Turn final grades into a GPA with the GPA calculator, or average a list of test scores with the average calculator.

Frequently asked questions

How do I calculate what I need on my final?

Required final score = (target grade − current grade × (1 − final weight)) ÷ final weight, with the weight as a decimal. With an 84% current grade, a final worth 30% and a target of 85%: (85 − 84 × 0.7) ÷ 0.3 = 87.33%.

What if the answer is over 100%?

Then the target can’t be reached with the final alone unless extra credit is available. The calculator tells you, and the table shows which grades are still possible.

How do I calculate a weighted grade?

Multiply each category’s score by its weight, add them up and divide by the total weight. Homework 92% × 20 + quizzes 85% × 15 + midterm 78% × 25 + project 95% × 10 = 6,015; divided by 70 = 85.93%.

What if my weights don’t add up to 100%?

That’s fine for a grade so far — the calculator divides by the weight completed. It also shows how much of the course has been graded.

How are letter grades decided?

The calculator uses a common US scale: 93%+ A, 90% A-, 87% B+, 83% B, 80% B-, 77% C+, 73% C, 70% C-, 67% D+, 60% D, below 60% F. Your course may use different cut-offs — check the syllabus.

Where do I find my current grade and weights?

Your course syllabus lists the weight of each category, and your school’s learning platform usually shows your current grade.

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