Free Online EZ Grader & Grade Curve Calculator

This free easy grader online instantly generates a complete score chart for any assignment — just like the classic cardboard EZ Grader teachers have used for decades, but with no sliding wheel to fumble with. Enter the number of questions and the max score to get a full lookup table of every possible grade. Need to curve the class? Use the optional grade curve calculator below to apply a flat point bump, percentage boost, or square-root curve — and see both the original and curved scores side by side.

EZ Grader Calculator

Questions Out of Step Grade Curve Curve Amount Decimal Places

How to Use This Easy Grader Online

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.
Grade Curve	Optional curve method to apply to every score. Choose from flat points, percentage boost, or square-root curve.
Curve Amount	The number of points or percentage to add (not used for square root).

Once you click Calculate, the table shows Missed, Correct, and Score columns. If a curve is selected, a Curved Score column appears alongside the original.

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.
Optionally, choose a Grade Curve method and enter a curve amount.
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.

Using the Grade Curve Calculator

Enter 25 questions, 100 out of, Step 1. Select Flat points added and enter 5 as the curve amount. The chart will show both the raw score and the curved score (raw + 5 points) for every possible number of questions missed — no math required.

Why Use a Digital EZ Grader?

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 easy grader online 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
Built-in grade curve calculator — no second tool needed
No sliding parts to break or misread
Always available in any browser, on any device
Free, with no app or account required

Grade Curve Methods Explained

A grade curve adjusts raw scores upward when a test was harder than intended. This calculator supports three common methods:

Flat Points Added

Every score gets the same number of points added. Simple and transparent — easy for students to understand. Example: add 5 points to every score on a test where the class average was 70 and you wanted 75.

Percentage Boost

Every score is multiplied by a percentage increase. A 10% boost turns a 70 into a 77 and an 85 into a 93.5 (rounded to 94). This method widens the gap between high and low scores.

Square Root Curve

The most commonly referenced curve formula in education: curved = √(raw / max) × max. A student who scored 64 on a 100-point test gets a curved score of √(64/100) × 100 = 80. This curve helps struggling students the most while still rewarding strong performers.

Frequently Asked Questions

What is an EZ Grader?

An EZ Grader is a sliding cardboard chart that maps questions missed to a percentage score. Teachers have used them since the 1930s to avoid doing division by hand while grading a stack of papers. This easy grader online replicates that function digitally and adds support for any number of questions, any point scale, partial credit, and a built-in grade curve calculator.

What is a grade curve calculator?

A grade curve calculator adjusts raw test scores upward to account for an unexpectedly difficult exam. Common methods include adding flat points, applying a percentage boost, or using a square-root curve. This tool lets you preview curved scores alongside raw scores before entering anything in your gradebook.

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.

How does the square root curve work?

The formula is Curved Score = √(Raw Score / Max Score) × Max Score. It gives the biggest boost to the lowest scores while still rewarding high scorers. A 36 becomes a 60, a 64 becomes an 80, and a 100 stays at 100. If you want to apply a square root curve to a full set of student scores at once rather than generating a lookup table, the dedicated Square Root Curve Calculator lets you paste in the whole class's grades and see every curved score in one go.

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.