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Test Score Calculator
Convert your raw test score to percentage, letter grade, percentile rank, and GPA equivalent. Supports curved grading, class average comparison, and multiple grading scales. Perfect for students analyzing exam results.
Understanding your test score in context helps you assess your academic standing and identify areas for improvement. This calculator converts raw scores to all standard grade formats and shows how your result compares to class averages and grading curves.
A raw test score only becomes meaningful when converted to a percentage and compared to the class performance. A 72/100 on a very hard exam might earn an A after curving, while 90/100 on an easy exam might be a class average. Context matters as much as the raw score.
Types of Grading Curves
Curve Type
Method
Example
Flat Curve
Add fixed points to all scores
72 + 8 = 80%
Scale to Top
Highest score = 100%, others scale
Top=92: multiply by 100/92=1.087
Square Root
Score% × 10 = curved grade
72% → √72 × 10 = 84.9%
Bell Curve
Adjust to target class mean
Mean 65 → target 75: add 10
No Curve
Raw score is final grade
72% = 72%
How Curves Affect Rankings
Grade curves are applied when the class average is significantly lower than the instructor target (typically 70-75%). Curves benefit all students proportionally but do not change relative rankings. If you scored above average before the curve, you will still be above average after. Focus on absolute score improvements rather than relying on curves.
Standardized vs Classroom Tests
Classroom tests: raw score converted directly to percentage. Standardized tests (SAT, ACT, GRE, MCAT): use scaled scoring — raw score converted to a scale score through equating to account for test difficulty variation across different administrations. A 700/800 on the SAT Math in one year equals the same percentile as 700 in another year, even if the tests had different difficulty levels.
Frequently Asked Questions
Percentage = (Points Earned / Total Points) × 100. For 47/60: 47/60 × 100 = 78.3%. For 143/175: 143/175 × 100 = 81.7%. Always divide your score by the total possible, then multiply by 100.
A curved score adjusts raw scores upward when the class average is lower than expected. Common methods: adding flat points to everyone (e.g., +8 points), scaling so the highest score = 100%, or using square root curve (multiply √raw% by 10). A 72% with an 8-point curve becomes 80%.
Percentile rank = (number of students who scored below you / total students) × 100. If you scored higher than 35 of 40 students: 35/40 × 100 = 87.5th percentile. Percentile rank shows relative performance compared to your class, not your absolute score.
Square root curve: new score = √(raw%) × 10. Example: raw score 64% → √64 × 10 = 8 × 10 = 80%. Raw 81% → √81 × 10 = 90%. This curve helps lower scores more than higher scores and keeps perfect scores at 100%.
Work backwards: Points for A = (90/100) × Total Points. For 90% = A on a 80-point test: 90/100 × 80 = 72 points minimum. For 93% = A on 60-point test: 93/100 × 60 = 55.8 → need 56 points. For curved exams, you need fewer raw points to achieve the same letter grade.
One test score impact = (Test Weight / Number of Tests) × Grade Shift. If tests are 60% of grade and there are 3 tests (20% each): one 50% test vs 90% means losing 40% × 20% = 8 percentage points on your course grade — roughly one letter grade. Recoverable, but act quickly by improving on subsequent tests.