Compare points-added, square-root, top-score scaling, or factor-based curves without assuming one school-wide grading policy.
A curve is an instructor-defined grading policy. This tool applies the chosen mathematical transformation only; it does not determine whether a curve is appropriate.
Separate question-count tests, pure points, weighted categories, final-exam weighting and GPA scales. Then reconcile the calculator with the syllabus rule actually used by the class.
Paste a class list, apply one reproducible curve to every row, then inspect the mean, spread, range, letter outcome, and CSV handoff before changing a gradebook.
Ready.
Additive, square-root, top-score scaling, and multiplier methods can produce very different results from the same raw score. The calculator shows the arithmetic, not a recommendation for grading policy.
The raw mathematical result is not automatically capped because some courses allow extra credit while others cap grades at 100. Apply your own course rule.
A curve is normally a transformation applied consistently to a set of scores, not a private adjustment to one number. Pasting the class scores makes it possible to inspect the original and curved mean, spread, range, and per-score changes. That distribution view can reveal whether one method boosts low scores much more than high scores or changes the class spread in a way the instructor did not intend.
Adding a constant preserves pairwise score differences, scaling to the highest score preserves ratios, a square-root curve changes the shape, and a z-score fit can change both mean and spread. A target-average shift answers a different question again. Compare methods using the same source list and document the selected formula so the final gradebook can be reproduced instead of relying on a vague label such as curved.
Some courses allow extra credit or scores above 100 while others clamp every result to a fixed range. A cap changes the class distribution because only scores that cross the boundary are affected. Keep the cap or floor setting visible beside the output, and do not infer the correct rule from the mathematics alone. The syllabus or instructor policy remains authoritative.
A class mean can look reasonable even when one row was mistyped or omitted. Preserve the row-level before, after, change, and letter classification when moving results into a spreadsheet or gradebook. Recount the number of scores and compare the raw mean with the source system before using the transformed list, especially when scores were pasted from a column with headers, blanks, or percentage symbols.
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