Grading
Square root curve
Lifts low marks much more than high ones, because the square root rises steeply near zero and flattens out near 100.
The Formula
curved = 10 x sqrt(score)
Lifts low marks much more than high ones, because the square root rises steeply near zero and flattens out near 100.
| Symbol | Meaning | Unit | Notes |
|---|---|---|---|
| c | Curved score | % | The mark after the square root transformation. |
| s | Raw score | points | The mark before any curve, out of 100. |
What Each Symbol Means
c%
Curved score
The mark after the square root transformation.
spoints
Raw score
The mark before any curve, out of 100.
See It Worked With Real Numbers
A formula on its own does not tell you which number goes where. The how to calculate a curved grade page applies this equation to a concrete case, shows every intermediate step, and names the mistakes that produce a wrong answer even when the algebra is right.
Where This Formula Appears
This equation is the working core of How To Calculate A Curved Grade, filed under Education. Every number the guide produces comes from substituting into this one line.