Grade Curve Calculator
A grade curve raises scores so the class does better on paper. Two common methods are shown here: scale to the top score, or use a square-root curve.
- Free
- Works offline after your first visit
- Saves on this device
- No sign-up
- Updated
How it works
Top score method: divide your score by the highest score in the class and multiply by 100, so the top score becomes 100 and everyone else moves up by the same share.
Square-root method: multiply the square root of your score by 10. This lifts low scores more than high ones, and a score of 100 stays at 100.
Worked example
A score of 68 on a test where the top score was 92, curved by the top score method, becomes 73.9.
Questions
Which method should I use?
Ask your teacher. Each method is a rule the teacher chooses, and this tool only shows the arithmetic of each one.
Does a curve change the grades of other students?
Yes. A top-score curve depends on the highest score, so one high mark moves every grade in the class.
Is a curve the same as extra credit?
Not quite. A curve changes the scale for the whole class, while extra credit adds points to certain work.
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