Grade Curve Calculator

This applies a curve to a whole class of raw scores rather than to one paper. Paste the scores, set the maximum the test was out of, and pick the square root curve, the highest score curve that puts the best paper on full marks, or a linear rescale to a chosen class mean and spread. It returns every score before and after, the class mean, the highest and lowest, the largest single gain and how many pass at your threshold. Curved scores are held to the maximum unless you allow more. Which curve to use is a grading policy rather than arithmetic, so the result says what each one did instead of recommending one.

Calculator Type

new = sqrt(raw x maximum). On a 100 point paper that is 10 x the square root of the raw score.

One raw score per student, in any order. Decimals are fine.
The points the paper was out of. Leave it at 100 for percentages.
Used only to count how many pass before and after the curve.
Widget

Adds the same number of points to everyone, enough to put the best paper in the room on full marks.

One raw score per student, in any order. Decimals are fine.
The points the paper was out of. Leave it at 100 for percentages.
Used only to count how many pass before and after the curve.
Widget

A linear rescale that moves the class mean where you want it. This is what curving to a C average means in practice.

One raw score per student, in any order. Decimals are fine.
Where the class average should land. A C average on a 100 point paper is usually 75 or so.
How far apart the class should finish. A smaller number squeezes everyone toward the mean.
The points the paper was out of. Leave it at 100 for percentages.
Used only to count how many pass before and after the curve.
Widget
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