| Quiz Name | Points Earned | Total Points | Grade | Remove |
|---|
Letter grade scale reference
| Score | Letter | GPA |
|---|---|---|
| 97-100% | A+ | 4.0* |
| 93-96% | A | 4.0 |
| 90-92% | A- | 3.7 |
| 87-89% | B+ | 3.3 |
| 83-86% | B | 3.0 |
| 80-82% | B- | 2.7 |
| 77-79% | C+ | 2.3 |
| 73-76% | C | 2.0 |
| 70-72% | C- | 1.7 |
| 67-69% | D+ | 1.3 |
| 63-66% | D | 1.0 |
| 60-62% | D- | 0.7 |
| 0-59% | F | 0.0 |
* A+ = 4.0 at most US colleges; a minority award 4.3.
How to Calculate a Quiz Grade
Every quiz grade reduces to a single formula: divide your points earned by the total points possible, then multiply by 100 to get the percentage. Whether the quiz is worth 10 points or 100 points, the math is the same.
- Points Earned = the raw score your teacher marked on the quiz
- Total Points Possible = the maximum points the quiz is worth
- Multiply by 100 to convert the decimal to a percentage
For a single quiz, Quick Score mode handles this instantly. For multiple quizzes with different point totals, switch to Multi-Quiz mode. The calculator sums all earned points and all possible points before applying the formula, so a 50-point quiz weighs five times more than a 10-point quiz in the overall average.
Quiz Calculator: Single vs. Multiple Quizzes
The distinction matters more than most students realize. Averaging percentages directly is wrong when quizzes carry different point values. A student who scores 90% on a 10-point quiz and 60% on a 50-point quiz does not have an overall average of 75%. The correct calculation sums points first: 9 + 30 = 39 earned out of 10 + 50 = 60 possible, giving 65%. That is a D, not a C.
This calculator uses the correct weighted method. Enter each quiz in Multi-Quiz mode and the weighted average appears automatically. The SVG bar chart shows individual scores side by side so you can spot which quiz dragged the average down most.
Quiz Score Calculator: Grading Scales Compared
The letter grade your raw percentage earns depends on which scale your instructor uses. Three scales dominate US education. Most colleges and high schools use the plus/minus scale. Some districts, particularly in the South, use the 7-point scale. Flat 10-point scales without plus/minus are also common, especially in K-8 settings.
| Letter Grade | Plus/Minus Scale (most common) | Flat 10-Point Scale | 7-Point Scale |
|---|---|---|---|
| A | 90-100% (A-, A, A+) | 90-100% | 93-100% |
| B | 80-89% (B-, B, B+) | 80-89% | 85-92% |
| C | 70-79% (C-, C, C+) | 70-79% | 77-84% |
| D | 60-69% (D-, D, D+) | 60-69% | 70-76% |
| F | Below 60% | Below 60% | Below 70% |
Scale definitions based on AACRAO academic record standards and National Center for Education Statistics grading scale surveys. Confirm the scale with your course syllabus before relying on these cutoffs for high-stakes decisions.
Quiz Weight in Your Course Grade by Subject
A quiz score matters in proportion to how much weight your instructor assigned to quizzes in the syllabus. The table below reflects the ranges seen across common US course types. Online courses often push quiz weight higher because quizzes substitute for in-person participation and attendance checks. Upper-division college courses typically rely on fewer, higher-stakes exams and assign quizzes a smaller fraction of the final grade.
| Course Type | Typical Quiz Weight | Typical Exam Weight | Notes |
|---|---|---|---|
| High School Math | 10-20% | 40-60% | Chapter quizzes common |
| High School Science | 10-15% | 40-50% | Lab reports carry separate weight |
| High School English | 10-20% | 30-50% | Reading quizzes on assigned texts |
| College Intro Course | 10-15% | 50-70% | Some courses drop the lowest quiz |
| College Upper Division | 5-10% | 60-80% | Fewer, higher-stakes quizzes |
| Online Course | 15-25% | 30-50% | Replaces in-person participation |
To see how your current quiz average shifts your overall course grade, take your quiz average and the quiz weight from your syllabus into the weighted grade calculator.
Quiz vs. Test: What the Difference Means for Your Grade
Quizzes and tests use the same percentage formula. The practical difference is stakes, frequency, and what they cover. A quiz typically covers recent material from one or two class sessions, runs five to twenty minutes, and carries five to thirty points. A test covers a larger unit and often counts for a higher percentage of the course grade.
A student in a high school biology class might take a 20-point quiz every week and a 100-point unit test every four weeks. If quizzes carry 15% of the final grade and tests carry 45%, each individual quiz counts for roughly 0.75% of the final grade. Missing one quiz by 10 points shaves less than 0.1% off the final course grade. Still, a pattern of below-average quiz scores signals that the underlying material is not sticking, which will show up on the higher-stakes unit test. Use the quiz grade calculator after each quiz to catch that pattern before the exam.
For multi-section tests with separately scored parts, the test grade calculator handles that workflow. For computing what final exam score you need to hit a target course grade, use the final grade calculator.
How to calculate quiz grade as a percentage?
What letter grade is a 75% on a quiz?
How does the quiz average calculator weight multiple quizzes?
What percentage is needed to pass a quiz?
How do I simulate a drop-lowest quiz policy in my grade calculation?
How do quiz scores affect my overall course grade?
Grading scales and quiz policies vary by school, department, and instructor. Always verify score cutoffs and drop-lowest policies with your course syllabus or instructor. Last verified: 2026-05-26. Formula source: National Center for Education Statistics grading practices data.