Test Grade Calculator

Determining a test score involves basic arithmetic combined with a predefined letter grade scale. First, the total number of questions on the exam is calculated by summing correct and incorrect answers:

Total Questions = Correct Answers + Incorrect Answers

Next, the overall percentage score is derived by dividing the number of correct answers by the total number of questions and multiplying by 100:

Percentage (%) = (Correct Answers / Total Questions) × 100

Finally, your percentage is mapped to a letter grade based on threshold limits for grades like A+, A, A-, B+, B, B-, C+, C, C-, D+, D, D-, and F. Standard grading scales often set an A starting at 90% or 93%, but cutoffs can be adjusted based on specific course syllabi.

Suppose a student takes a science exam with 40 questions total and gets 33 questions correct (meaning 7 questions were wrong). The standard grade cutoff for a B- is set at 80% and a B at 83%.

Step 1: Verify total questions.
33 right + 7 wrong = 40 total questions.

Step 2: Compute percentage score.
(33 / 40) × 100 = 82.5%

Step 3: Assign letter grade.
Comparing 82.5% against standard thresholds (e.g., B- is 80%, B is 83%), an 82.5% corresponds to a B- grade (or standard B if rounded up to 83%).

1. Verify Grading Cutoffs: Always check your course syllabus. Some teachers use a strict 10-point scale (90% = A, 80% = B), while others use plus/minus boundaries like 93% for a solid A.

2. Factor in Partial Credit: If questions are worth different point values or grant partial credit, compute your score using total points earned divided by total available points rather than raw question counts.

3. Understand Rounding Policies: Check if your instructor rounds percentages up to the nearest whole number, as an 89.5% could mean the difference between a B+ and an A-.