Grade Curve Calculator
Curve a set of test scores — raise the top score to 100, add a flat bonus, or scale to a target average — and see each student's new score.
How to use
- 1Paste the class's raw scores.
- 2Choose a curving method and see the new scores and class average.
How it's calculated
Top-to-100: add (100 − highest) to everyone. Flat: add a fixed number. Target average: add (target − current average). Square-root curve: 10 × √score. Scores are capped at 100.
Frequently asked questions
Which curve is fairest?
Adding points preserves the gaps between students; the square-root curve helps low scores most. Choose based on your grading policy.
Is this a true bell curve?
No — assigning grades by a fixed distribution isn't common anymore. These methods adjust scores rather than force a distribution.
Can scores go above 100?
They're capped at 100 here.