Quick Grader

The quick grader is the fastest way to convert test scores into percentages and letter grades. Enter your total questions and number wrong to see instant results with a visual dashboard, half-point support for partial credit, and a complete printable grading chart.

How to Use This Quick Grader

Click a preset button (10, 15, 20, 25, 30, 50, or 100) to set the total number of questions, or type a custom number. Then enter how many the student got wrong. Results update instantly as you type — no button needed.

Choose your grading scale from the tabs: Standard 10-point, Plus/Minus, or 7-Point to match your school guidelines. If your test allows partial credit, toggle on half-point mode to enter wrong answers in 0.5 increments. The “How Many Can I Miss?” table shows the maximum wrong answers for each letter grade, and the grading chart gives you a complete reference for every possible score.

Print the grading chart and keep it on your desk for quick reference all semester. For tests where questions carry different point values, use our test grade calculator instead.

How Quick Grading Works (Formula)

Each question on a test carries equal weight. On a 20-question quiz, each question is worth 5 percentage points. On a 50-question exam, each is worth 2 points. Understanding this relationship helps you design tests that produce fair grade distributions.

The original physical E-Z Grader sliding tool used this same formula on teacher desks for decades. Our EZ grader is the classic digital version, while this quick grade calculator adds half-point support and preset buttons for faster workflow. Many teachers search for a quickgrade calculator that handles partial credit, and this is it. For a complete reference of how percentages map to letter grades across systems, check the grading scale page.

Half-Point Scoring and Why It Matters

Partial credit is standard practice in math, science, and many written assessments. A student who sets up a problem correctly but makes an arithmetic error at the end deserves more credit than one who leaves the question blank. Half-point scoring reflects this by allowing 0.5-point deductions instead of full points only.

Most online grading tools force whole-number inputs, which means teachers either round up (inflating grades) or round down (penalizing students). Neither approach is accurate. This quick grader solves that problem with a single toggle. When half-point mode is active, the wrong-answer input accepts 0.5 increments, and the grading chart expands to show every half-point score.

The impact of half-point scoring grows with shorter tests. On a 10-question quiz, each whole question is worth 10 percentage points, so rounding creates large swings. With half-point mode, a student who loses 2.5 points scores 75% instead of being rounded to either 70% or 80%. That 5% difference can mean a full letter grade. On longer tests with 50 questions, each question is only 2%, so the rounding effect is smaller, but partial credit still produces fairer scores across the class.

Choosing between grading scales also changes outcomes. The Standard 10-point scale gives students more room, since an A starts at 90%. The 7-point scale, common in many Southern US school districts, sets the A threshold at 93%, which means fewer students earn top marks on the same test. Switching scales in this quick grader lets you compare both side by side before deciding which scale to apply. Many teachers discover that a test producing mostly B grades on one scale produces mostly C grades on another.

When you need to combine individual test scores into an overall course grade with weighted categories, our grade calculator handles that automatically. For teachers managing grade breakdowns across an entire class, the teacher grader offers additional tools designed for educator workflows.