Test grades
How Many Questions Can You Miss and Still Pass?
How many questions you can miss and still pass: the formula, a 25-question breakdown, and a table for 10- to 100-question tests at 60%, 70%, 75%, 80% and 90%.
GRADING KNOWLEDGE BASE
Grade Calculator Blog
Clear, practical guides for understanding test grades, raw scores, weighted categories, extra credit, rounding rules, and percentage-to-letter-grade conversions.
43 in-depth guides · Teacher and student friendly · Updated August 2, 2026
LATEST GUIDES
Understand the math behind every grade.
Each guide answers one grading question directly, shows the formula or policy behind it, and links to the right calculator for the next step.
Grade formulas
Weighted vs. Unweighted Grades: What Is the Difference?
What weighted grades mean, how weighted and unweighted grades differ, how to calculate a weighted grade (even with empty categories), and how course weights differ from weighted GPA.
Extra credit
How Extra Credit Affects Your Grade
Learn how bonus points and extra-credit assignments change a test or course grade, with formulas, examples, and common gradebook methods.
Grade policies
Grade Rounding Rules: When Does 89.5 Become 90?
Understand common grade rounding methods, decimal precision, boundary scores, and why an 89.5% does not automatically become a 90% in every course.
GPA basics
How to Calculate GPA (Weighted and Unweighted)
Learn the GPA formula step by step, see the difference between weighted and unweighted GPA, and work through a full example with credit hours.
GPA basics
High School GPA Scale: 4.0 vs. 5.0 Explained
Understand the difference between the 4.0 unweighted GPA scale and the 5.0 weighted GPA scale used for AP, Honors, and IB courses in high school.
Final exams
What Grade Do I Need on My Final Exam?
Learn the formula for finding the score you need on a final exam to reach a target course grade, with a worked example and common edge cases.
GPA basics
How to Calculate Cumulative GPA Across Semesters
Learn how to combine GPA and credit hours from multiple semesters into one cumulative GPA, with a worked multi-term example.
GPA basics
Letter Grade to GPA Conversion Chart
A complete letter grade to GPA conversion table on the standard 4.0 scale, including plus/minus grades and common percentage equivalents.
Grade policies
What Is a Passing Grade? How Thresholds Differ by School
Learn the most common passing-grade thresholds for K-12 and college courses, why they differ by school, and how pass/fail grading changes the rules.
Grade policies
How Do Grade Curves Work?
Learn the most common ways instructors curve grades, including flat-point curves, percentage curves, and scale shifts, with worked examples of each.
For teachers
Grade Calculators for Teachers: Batch-Grading Tips
Practical tips for teachers using a grade calculator and grade chart to grade quizzes, tests, and assignments faster and more consistently.
Grade recovery
What to Do If Your Grade Is Slipping Mid-Semester
A practical, calculator-based approach to diagnosing a slipping grade mid-semester and figuring out what it will actually take to recover it.
GPA basics
AP, Honors, and IB Weighted GPA Points Explained
Understand exactly how AP, Honors, and IB courses add bonus GPA points, why the bonus varies by school, and how it affects class rank.
Grade formulas
How to Calculate Your Grade Percentage (With Examples)
Learn the formula for turning correct answers or points earned into a percentage grade, plus how to combine weighted categories and solve for a final exam score.
Grading tools
What Is an Easy Grader (EZ Grader)? How the Grading Chart Works
Learn what an Easy Grader (EZ Grader) is, the formula behind it, where the printed grading chart came from, and how to use one to grade tests fast.
Grading tools
How to Grade Tests Fast: The Quick Grader Method
Learn the quick grader method teachers use to turn test scores into percentages and letter grades in seconds, with formulas, examples, and shortcuts.
Grade policies
Grading Scale Explained: A–F, Percentages, and GPA
See the standard A–F grading scale with percentage and GPA breakdowns, why there's no E grade, how plus/minus grades work, and how scales vary by school.
Grading tools
Grade Checker: See Your Score Instantly
Check a test grade in seconds with this free grade checker guide: the formula, step-by-step instructions, common mistakes, and a standard scale reference.
Grading tools
Gradebook Calculator: Track Your Grade Instantly
Learn how a gradebook calculator combines weighted categories into one course grade, with a worked example, mid-semester tracking tips, and common mistakes to avoid.
Grade formulas
How to Calculate Your Grade: A Simple Walkthrough
A step-by-step walkthrough for calculating your grade: identify your grading system, gather your scores, run the math, and avoid the mistakes that throw off the number.
GPA basics
How Credit Hours Actually Affect Your GPA
Learn how credit hours weight your GPA calculation, with a worked example, why high-credit classes move your average more, and what pass/fail and transfer credits do to the number.
For teachers
Rubric vs. Points Grading: Which Is Faster?
Compare rubric grading and point-based grading for real classroom speed — what each costs upfront, which is faster per paper, and tips to speed up either method.
Grade formulas
Semester Grade vs. Final Grade Explained
Learn the difference between a semester grade and a final course grade, how each is calculated, and the common mix-ups — like dropped scores and mismatched weights — that throw off the number.
Test grades
What Grade Is X Out of Y? Score-to-Grade Conversion Chart
Divide the score by the total and multiply by 100, then match your grading scale. Score-to-grade conversion chart for tests out of 10, 20, 25, 50, and 100.
Grade policies
Is 89% a B? Percentage-to-Letter-Grade Lookup
89% is a B on the plain scale, a B+ with plus/minus, and one point short of an A−. Full percentage-to-letter table plus a ruling on every borderline percentage.
Grade policies
10-Point vs. 7-Point Grading Scale Explained
A 7-point scale needs a higher score for every letter — an 82% is a B on a 10-point scale but a C on a 7-point. Side-by-side conversion chart and the GPA effect.
For teachers
How to Convert a Rubric or Standards-Based Score to a Grade
Add the points, divide by levels times criteria, multiply by 100 — then rescale so the lowest level is 60%, not 0%. Conversion table, the formula, and the Marzano method.
Grade formulas
How Much Is One Assignment Worth to Your Grade?
One assignment is worth its weight — its points divided by the course total, or its category weight divided by the number of assignments. Tables plus the math for how far one score moves your grade.
For teachers
Free Printable Grading Scale for Teachers (Any Test Size)
Free printable grading scale for teachers: plus/minus and 10-point charts, minimum correct answers for 10–50 question tests, and how to print and laminate your own.
Grade policies
Grade Percentage Chart: Every Percent to Letter and GPA
Grade percentage chart for every whole percent from 100 to 60, with the letter on the 10-point, 7-point and plus/minus scales and its 4.0 GPA value.
Grade policies
What Percentage Is an A−? Plus and Minus Grade Percentages
An A- is 90–92% and worth 3.7 GPA. Every plus and minus grade percentage from A+ to D-, how the bands are built, and how they change your GPA.
Extra credit
Can Extra Credit Lower Your Grade? 4 Reasons It Seems To
Real extra credit can't lower your grade, but your grade can drop after it. Four gradebook reasons, with the math, and how teachers set extra credit up correctly.
Test grades
How to Calculate the Percentage of Correct Answers
Divide correct answers by total questions and multiply by 100. Worked examples, plus mixed point values, partial credit, guessing penalties and percentiles.
Test grades
What Is 15 Out Of 20 As A Grade? Percentage, GPA, And Full 20-Question Scale
15 out of 20 is exactly 75.00%, a solid C grade on the standard US scale. See the full 20-question grade chart, GPA conversions, scale variations, and syllabus weighting math.
Test grades
What Is 17 Out Of 20 As A Grade? Percentage, GPA, And Full 20-Question Scale
17 out of 20 is exactly 85.00%, a solid B grade on the standard US scale. See what you need for an A, why B+ is mathematically unreachable, and GPA impact.
Test grades
What Is 14 Out Of 20 As A Grade? Percentage, GPA, And Full 20-Question Scale
14 out of 20 is exactly 70.00%, a C− or C grade on the standard US scale. See if 14/20 is passing, college prerequisite rules, GPA values, and recovery tips.
Test grades
What Is 11 Out Of 15 As A Grade? Percentage, GPA, And Full 15-Question Scale
11 out of 15 is 73.33%, a solid C on the standard US scale. See the full 15-question score chart, why each question swings 6.67%, and turnaround math.
Test grades
What Is 10 Out Of 15 As A Grade? Percentage, GPA, And Full 15-Question Scale
10 out of 15 is 66.67%, a D grade on the standard US scale. Discover passing boundaries, college prerequisite risks, 1.0 GPA value, and recovery math.
Test grades
What Is 26 Out Of 30 As A Grade? Percentage, GPA, And Full 30-Question Scale
26 out of 30 is 86.67%, a high B grade on the standard US scale. See the complete 30-question score chart, B+ rounding cutoffs, and pacing to achieve an A.
Test grades
What Is 40 Out Of 50 As A Grade? Percentage, GPA, And Full 50-Question Scale
40 out of 50 is exactly 80.00%, a B− on the standard US scale. See the full 50-question midterm conversion chart, GPA values, and syllabus recovery math.
Test grades
How Many Questions Can You Miss On A 20-Question Test?
On a 20-question test you can miss 8 questions and still pass at 60%, but only 1 for an A. See the exact missed-question limit for every letter grade.
Test grades
How Many Questions Can You Miss On A 25-Question Test?
On a 25-question test you can miss 10 questions and still pass at 60%, 7 for a C and 5 for a B. See the exact missed-question limit for every letter grade.