Grade Curve Calculator

Calculate Your Grade

Grading Scale

Grade Minimum (%) Maximum (%)

Curved Grading Scale

Grade Minimum (pts) Maximum (pts)
A
B
C
D
F

Statistics:

Statistic Points
Total Possible
Average
Median
Standard Deviation
Minimum
Maximum

Custom Grading Scale

How is my curved grade calculated?

In this curved grade calculator, it uses a piecewise linear interpolation to estimate the curved percentage from your raw score and the curved point intervals.

First, your raw score is matched to the letter grade relative to the curved point intervals.

Then, the position of that score within that interval is mapped proportionally to the corresponding percentage range in the default grading scale.

So, you end up with the following two equations:

$$ P_{\text{raw}} = \frac{x}{M} \times 100 $$ $$ P_{\text{curved}} = y_{\text{min}} + \frac{x - x_{\text{min}}}{x_{\text{max}} - x_{\text{min}}} \left(y_{\text{max}} - y_{\text{min}}\right) $$

Where \(M\) is the maximum possible score, \(x\) is the student's raw score, \(x_{\text{min}}\) and \(x_{\text{max}}\) are the curved interval boundaries, and \(y_{\text{min}}\) and \(y_{\text{max}}\) are the corresponding default grading scale percentages.