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※ Assessment & grading
Grade Curve Calculator
Paste a column of raw scores and apply a fair curve — add a flat boost, scale the top score to 100, or apply a square-root curve. See the adjusted marks and a quick distribution so you can decide what feels right.
Avg before
69.4%
Avg after
82.8%
| # | Raw | % | Curved |
|---|---|---|---|
| 1 | 72 | 72% | 85% |
| 2 | 65 | 65% | 81% |
| 3 | 88 | 88% | 94% |
| 4 | 54 | 54% | 73% |
| 5 | 91 | 91% | 95% |
| 6 | 47 | 47% | 69% |
| 7 | 78 | 78% | 88% |
| 8 | 60 | 60% | 77% |
How to use the grade curve calculator
- 1Paste your raw scores, one per line.
- 2Set the maximum possible score for the test.
- 3Choose a curve: flat boost, scale-to-top, or square-root.
- 4Review the adjusted scores and average before applying them.
Questions, answered
What is a square-root curve?
It replaces each percentage with the square root of (percentage × 100), gently lifting lower scores more than high ones — a common, fair classroom curve.
Can scores go above 100%?
The tool caps adjusted scores at 100% so no student exceeds the maximum.
Are my scores uploaded anywhere?
No — all calculation happens in your browser. Nothing is sent to a server.
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