📊 Grade Calculator

How to Use the Grade Calculator

Our Grade Calculator makes it incredibly easy to determine your test score and letter grade. Whether you're a teacher preparing a grading chart or a student checking your performance, here's how to use it:

Step 1: Enter Total Questions

Type the total number of questions on your test, quiz, or exam into the first field. This can be any number from 1 to 500. The calculator supports tests of any size — from a quick 10-question quiz to a comprehensive 200-question final exam.

Step 2: Enter Wrong Answers

Enter the number of questions you got wrong, or use the convenient +/− buttons to increment and decrement the count. As you adjust the number, your score updates instantly — no need to click a "calculate" button.

Step 3: Customize Settings (Optional)

Click the ⚙️ Grade Settings button to reveal customization options. You can adjust the grade cutoff percentages to match your school's specific grading scale. For example, some schools require a 93% for an A, while others use 90%. You can also toggle between standard letter grades (A, B, C, D, F) and plus/minus grading (A+, A, A−, B+, etc.) for more granular grade breakdowns.

Step 4: Review the Grade Chart

Scroll down to see the complete grade chart, which shows every possible score for your test — from getting zero wrong to getting every question wrong. This chart is perfect for teachers who need to create grading keys or students who want to see how many questions they can miss while still achieving their target grade.

About Grade Calculation

Grade calculation is a fundamental part of education. The most common method of determining a grade is by dividing the number of correct answers by the total number of questions and multiplying by 100 to get a percentage score. This percentage is then mapped to a letter grade based on a predefined grading scale.

Standard US Grading Scale

The most widely used grading scale in the United States assigns letter grades as follows: A (90–100%), B (80–89%), C (70–79%), D (60–69%), and F (below 60%). However, many schools and universities use slightly different cutoffs, which is why our calculator allows you to customize these thresholds.

Plus/Minus Grading

Many colleges and universities use a plus/minus grading system to provide more precision. In this system, each letter grade is subdivided — for example, a B+ (87–89%), B (83–86%), and B− (80–82%). This system can more accurately reflect a student's performance and is particularly common at the university level.

Why Grading Scales Matter

Different grading scales can significantly impact a student's GPA and academic standing. A student who earns an 89% might receive a B+ at one school but an A− at another. Understanding your school's specific grading scale is essential for accurate grade tracking. Our calculator lets you configure these exact cutoffs so your results are always relevant to your institution.