Teacher's Grading Calculator
This free online grading calculator helps teachers quickly generate a complete score chart for any assignment. Enter the number of questions, the maximum score, and an optional step increment — then get a full grading table showing every possible score. It's the digital version of the classic cardboard EZ Grader that teachers have relied on for decades, without the sliding wheel.
Grading Calculator
How to Use This Grading Calculator
The calculator generates a complete grade chart — a full lookup table showing the score for every number of questions missed. Here's what each field means:
| Field | Description |
|---|---|
| Questions | The total number of questions on the assignment. |
| Out of | The maximum possible score. Typically 100 for percentage-based grading. |
| Step | The increment between rows. Use 1 for whole-question scoring, or 0.5 for half-point increments. |
Once you click Calculate, the table shows three columns: Missed (questions wrong), Correct (questions right), and Score (the calculated grade).
Step-by-Step Instructions
- Enter the total number of questions in the Questions field.
- Enter the maximum score in the Out of field (usually 100).
- Leave Step at 1 for standard scoring, or adjust for partial credit.
- Click Calculate to generate the full grade chart.
- Find the number of questions a student missed in the Missed column — the Score column gives their grade.
Examples
Standard Quiz: 37 Questions, Out of 100
Enter 37 in Questions, 100 in Out of, and 1 in Step. A student who missed 8 questions got 29 correct and scored a 78%.
Half-Credit Scoring: 37 Questions with 0.5 Step
Same assignment, but with partial credit. Change Step to 0.5. A student who answered the equivalent of 33.5 questions correctly scores a 91% — a row that doesn't exist in a whole-number chart.
AP Exam Scoring: 9 Points, Out of 100
This calculator was originally built for AP Computer Science A free-response scoring, which is graded out of 9 points in half-point increments. Enter 9 in Questions, 100 in Out of, and 0.5 in Step to get a complete scoring chart.
Why Use a Grading Calculator?
Calculating grades by hand is tedious and error-prone, especially for assignments that aren't round numbers. A 43-question quiz out of 100? That math gets old fast when you have 30 papers in front of you.
This calculator generates a complete lookup table in one click. Reference it throughout an entire grading session without doing any arithmetic — find the number missed, read across to the score.
Advantages Over a Physical EZ Grader
- Works for any number of questions, including large counts and decimal steps
- Supports partial credit and custom step increments
- No sliding parts to break or misread
- Always available in any browser, on any device
- Free, with no app or account required
Frequently Asked Questions
What is an EZ Grader?
An EZ Grader is a sliding cardboard chart that maps questions missed to a percentage score. This calculator replicates that function digitally and supports any number of questions, any point scale, and partial credit.
How is the score calculated?
The formula is: Score = (Correct ÷ Total Questions) × Maximum Score. For example, 29 correct out of 37 on a 100-point scale: (29 ÷ 37) × 100 = 78.4%, rounded to 78.
Can I use a maximum score other than 100?
Yes. Change the Out of field to whatever the assignment is worth — 50 points, 25 points, 10 points, anything. The chart scales accordingly.
What does the Step field do?
Step controls the interval between rows in the chart. A step of 1 shows every whole-number score. A step of 0.5 adds half-point rows. A step of 5 gives a condensed chart useful for a quick overview of a long test.
Can I grade assignments with partial credit?
Yes. Set the Step to your partial-credit increment (0.5, 0.25, etc.) and those rows will appear in the chart.
Does this work for large tests?
Yes. Enter any number of questions — 50, 100, 150 or more — and the calculator handles it.
What if a student gets extra credit?
The chart runs from 0 missed up to the total question count. Scores above the maximum would need to be calculated separately using the formula above.
Why are scores rounded to whole numbers?
Scores are rounded to the nearest whole number by default, which matches standard gradebook practice. For decimal precision on individual scores, use (Correct ÷ Total) × Max directly.
Is there a limit to the number of questions?
No hard limit, but very large question counts with small step values produce very long tables. A step of 1 on a 200-question test produces 201 rows.
And if you're feeling retro, Amazon still sells the classic EZ-Graders.
