Enter the percentage grade in the tool, and the calculator will determine the square root curve grade.
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Enter the percentage grades (%) into the Square Root Curve Calculator to find the square root curve grades equivalent to the percentage grades.
The square root curve grading is a method to adjust the grades of an entire class uniformly. It is useful when an exam is unexpectedly difficult. This method boosts lower grades and converts them into an equivalent percentage using a simple formula.
The formula for the square root curve is:
Find the square root curve grade for a student with a 10% grade.
Using the formula: SRG = √G × 10
SRG = √10 × 10
SRG ≈ 3.1622 × 10
SRG ≈ 31.62%
This shows that a 10% grade curves up to approximately 31.62% using the square root method.
| Actual % | SqRt Curve | Actual % | SqRt Curve | Actual % | SqRt Curve | Actual % | SqRt Curve |
|---|---|---|---|---|---|---|---|
| 1 | 10 | 26 | 51 | 51 | 71 | 76 | 87 |
| 2 | 14 | 27 | 52 | 52 | 72 | 77 | 88 |
| 3 | 17 | 28 | 53 | 53 | 73 | 78 | 88 |
| 4 | 20 | 29 | 54 | 54 | 73 | 79 | 89 |
| 5 | 22 | 30 | 55 | 55 | 74 | 80 | 89 |
| 6 | 24 | 31 | 56 | 56 | 75 | 81 | 90 |
| 7 | 26 | 32 | 57 | 57 | 75 | 82 | 91 |
| 8 | 28 | 33 | 57 | 58 | 76 | 83 | 91 |
| 9 | 30 | 34 | 58 | 59 | 77 | 84 | 92 |
| 10 | 32 | 35 | 59 | 60 | 77 | 85 | 92 |
The instructor can boost the marks of the entire class using the square root grading curve, giving all students a more balanced score distribution.
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