Education
Grading on a Curve Calculator
Apply common grading-curve methods such as top-score scaling, flat-point adjustment, and custom maximum score scaling, then see the adjusted grade and letter estimate.
Which curve method should you use?
Different teachers mean different things by “curve.” Some scale the highest score to 100%, some add a fixed number of points to every score, and some lower the maximum score. This calculator includes all three because students often know the teacher’s curve style but need help converting it into a final percentage.
What formulas are used?
Top-score curve = your score ÷ top score × 100
Flat curve = (your score + added points) ÷ points possible × 100
Custom max curve = your score ÷ new maximum × 100
What should you not assume?
Do not assume every curve benefits every student equally. A top-score curve can change grades differently than a flat-point curve. Also, instructors may cap scores at 100%, apply category weights, or use letter cutoffs that differ from standard 90/80/70 bands.
Frequently asked questions
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It is common, but not universal. The correct method depends on the instructor.
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It caps the displayed adjusted score at 100% because most class gradebooks do. Some teachers may allow extra credit above 100.
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Then this calculator can still estimate the adjusted percent, but it may not match the official letter grade.
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Use points if the test was scored in points. The calculator converts to percent for readability.
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Yes, as long as the same curve rule applies to that category.