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Square Root Curve Calculator

Enter the percentage grade in the tool, and the calculator will determine the square root curve grade.

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Square Root Curve Calculator

Enter the percentage grades (%) into the Square Root Curve Calculator to find the square root curve grades equivalent to the percentage grades.

What is a Square Root Curve?

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.

Square Root Curve Formula

The formula for the square root curve is:

SRG = √G × 10

SRG = Student Root Curve Grade
√G = Square root of the percentage grade
G = Student Grade Percentage
Multiply the square root by 10 to scale the result

Example:

Find the square root curve grade for a student with a 10% grade.

Percentage grade: 10%

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.

How the Square Root Curve Calculator Works

Input:

Enter the student’s percentage grade
Click Calculate

Output:

Square root curve grade
Step-by-step calculation

Percentage vs Square Root Curve Grades

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

FAQs

How does the curve system work?

The instructor can boost the marks of the entire class using the square root grading curve, giving all students a more balanced score distribution.

References

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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

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

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