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Grade Curve Calculator

Calculate the grade scale for a normal grade curve with this calculator.

Add a Grade Curve Calculator Widget to your own website, or blog.

What is a grade curve?

A Normal Bell Curve calculates a grading curve from a comparison of
student results. A Bell Curve will calculate grades based on the
amount of standard deviations from the mean average.

Note: A small test population with a minimal difference between
the highest score and the lowest score will not result in an
effective Bell Curve scale.

Using a Bell Curve, the population grades will break down as follows:

Bell Curve Grade Chart

Example: In a true Bell Curve grading method, a test population of
100 students should have 2 students with a grade of "A",
14 students with a "B", a total of 68 with a "C", 14 with a "D"
and 2 with a grade of "F".

Grade curves aren't that bad.

Sometimes referred to as curved grading, bell curving, or simply curving, grading curves are a method of statistically assigning grades in a way that matches a pre-determined distribution of grades among the student population for a class. The reference to "curve" is because of the shape of the bell curve, that is a graphical representation for the probability density of the normal distribution (I know, it's a mouthful). It's important to note that this type of grading is often adjusted to fit the particular views of the teacher, or administration, for a given course.