How to Calculate Grade Percentage

Q: How do I calculate a weighted grade average?

Multiply each assignment score by its weight (as a decimal), then sum the results. Example: Exams worth 60% and scored 88, homework worth 40% and scored 95 -- (88 x 0.60) + (95 x 0.40) = 52.8 + 38.0 = 90.8%.

Q: What score do I need to pass?

Multiply the passing percentage by the total points. For a 70% passing threshold on a 50-point test: 0.70 x 50 = 35 points needed.

Q: How do I find out what I need on my final exam to get a certain grade?

Use the formula: Required Final Score = (Target Grade - (Current Grade x Current Weight)) / Final Weight. Example: You have 82% with 75% of the course complete and need 85% overall. Required Final = (85 - (82 x 0.75)) / 0.25 = (85 - 61.5) / 0.25 = 94%.

Q: What is the difference between a weighted and unweighted GPA?

An unweighted GPA uses a 4.0 scale regardless of course difficulty. A weighted GPA adds extra points for honors or AP courses (typically a 5.0 scale for the highest grades). Colleges often recalculate GPAs on their own scale, so weighted GPA advantages vary.

Your grade percentage tells you what fraction of the total possible points you earned. It converts directly to a letter grade and is the foundation for tracking your academic standing.

The grade percentage formula

Divide your earned points by the total possible points, then multiply by 100.

Grade % = (Points Earned / Total Points) x 100

Example: You scored 38 out of 45 points on a test. (38 / 45) x 100 = 84.4%. On the standard US scale, that is a B.

Standard US letter grade scale: A = 90-100%, B = 80-89%, C = 70-79%, D = 60-69%, F = below 60%. Many courses also use plus/minus grades within each band (B+ = 87-89%, B = 83-86%, B- = 80-82%).

Finding the minimum score to pass

Multiply the passing percentage by the total points available. For a 70% pass threshold on a 50-point test: 0.70 x 50 = 35 points needed to pass.

Calculating your current course grade

The formula above handles a single test. For your standing in the course as a whole, when every assignment is graded out of raw points rather than weighted categories, add up everything you have earned and divide by everything that was available.

Course Grade % = (Total Points Earned / Total Points Possible) x 100

Example: Quiz 1 was 17 out of 20. Homework was 45 out of 50. Test 1 was 83 out of 100. The project was 92 out of 100.

Total earned: 17 + 45 + 83 + 92 = 237. Total possible: 20 + 50 + 100 + 100 = 270. Course grade = (237 / 270) x 100 = 87.8%, a B+.

Note that this method only works when all points count equally. If your syllabus assigns percentage weights to categories, use the weighted method below instead -- adding raw points across weighted categories will give you the wrong answer.

Calculating a weighted grade average

Most courses weight different assignments differently. To find your overall course grade, multiply each component score by its weight, add all results, then verify the weights sum to 100%.

Course Grade = Sum of (Score x Weight) for all components

Example: Exams = 60% of grade, scored 88. Homework = 40% of grade, scored 95. Course grade = (88 x 0.60) + (95 x 0.40) = 52.8 + 38.0 = 90.8%. That is an A.

The weights tell you where your effort actually pays. Suppose tests carry 50%, homework 25%, and participation 25%, and you are averaging 79 on tests, 94 on homework, and 100 on participation. Your course grade is (0.50 x 79) + (0.25 x 94) + (0.25 x 100) = 88%. That near-perfect homework average is barely moving the number, because it only carries a quarter of the weight. Raising the test average by five points would do more than raising homework by fifteen.

Always check your course syllabus for exact weights. They vary widely -- some courses weight a single final exam at 50%, while others spread points across weekly quizzes, projects, and participation.

Grade percentage reference table

Use this table to quickly convert a raw score to a percentage and letter grade for the most common test formats.

Score / 50	Score / 100	%	Letter
49-50	98-100	98-100%	A+
47-48	94-96	94-96%	A
45-46	90-92	90-92%	A-
44	88	88%	B+
42-43	84-86	84-86%	B
40-41	80-82	80-82%	B-
39	78	78%	C+
37-38	74-76	74-76%	C
35-36	70-72	70-72%	C-
34	68	68%	D+
32-33	64-66	64-66%	D
30-31	60-62	60-62%	D-
below 30	below 60	below 60%	F

What do I need on my final to get a certain grade?

This is the most common end-of-semester question. Rearrange the weighted average formula to solve for the missing final exam score.

Required Final = (Target Grade - (Current Grade x Current Weight)) / Final Weight

Example: You currently have an 82% average. The final exam is worth 25% of your grade. You want to finish with at least 85%. Required Final = (85 - (82 x 0.75)) / 0.25 = (85 - 61.5) / 0.25 = 23.5 / 0.25 = 94%. You need a 94 on the final.

If the required score exceeds 100%, it is mathematically impossible to reach your target with the final exam alone. Focus on what is achievable and confirm your calculation with your professor.

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