How do I convert ISU GPA to percentage?

The standard conversion is Percentage = GPA × 25, which equals (GPA ÷ 4.0) × 100. For example, a GPA of 3.5 converts to 87.5%.

Which grades are excluded from the ISU GPA?

Grades of S (Satisfactory), P (Pass), NP (Not Pass), and T (test credit) are not used in calculating the grade point average, though they may count toward degree requirements. W and I marks also carry no quality points.

Iowa State University GPA Calculator & Percentage Converter

Q: What GPA scale does Iowa State University use?

Iowa State uses a 4.0 quality-point scale. A = 4.00, A- = 3.67, B+ = 3.33, B = 3.00, B- = 2.67, C+ = 2.33, C = 2.00, C- = 1.67, D+ = 1.33, D = 1.00, D- = 0.67, and F = 0.00. There is no A+ on the ISU scale, so the maximum GPA is 4.00.

Q: Does Iowa State have an A+ grade?

No. The highest grade at Iowa State is A, worth 4.00 quality points. ISU does not award A+, so the maximum cumulative GPA is 4.00.

Q: What GPA do I need to graduate from Iowa State University?

A cumulative GPA of 2.00 is required for a bachelor's degree. Graduation with distinction begins at a 3.50 cumulative GPA: Cum Laude 3.50 to 3.69, Magna Cum Laude 3.70 to 3.89, and Summa Cum Laude 3.90 or higher.

Tool 1

ISU GPA Calculator

Add each course with its letter grade and credit hours. Calculation uses ISU's official quality-point values.

Add Your Courses

Iowa State uses a 4.0 quality-point scale. The highest grade is A (4.00) — there is no A+.

Course / Subject

Letter Grade

Credit Hours

Course	Grade	Credits	Actions

Convert to Percentage →

The Math

How ISU GPA Is Calculated

Iowa State multiplies each grade's quality points by credit hours, then divides total quality points by total credits attempted.

ISU GPA Formula

\[ \text{GPA} = \frac{\displaystyle\sum \text{Quality Points}}{\displaystyle\sum \text{Credits Attempted}} = \frac{\displaystyle\sum (\text{Quality Points} \times \text{Credits})}{\displaystyle\sum \text{Credits}} \]

Quality PointsGrade value × credit hours for each course

Credits AttemptedTotal graded credits (excludes S, P, NP, T)

📝 Worked Example

An example using three courses:

Course	Credit Hours	Grade	Quality Points	Total
ENGL 150	3.0	A	4.00	3 × 4.00 = 12.00
MATH 165	4.0	B−	2.67	4 × 2.67 = 10.68
CHEM 167	3.0	C+	2.33	3 × 2.33 = 6.99
Total	10.0	—	—	29.67

Plugging into the formula:

\[ \text{GPA} = \frac{29.67}{10.0} \approx \mathbf{2.97} \]

Tool 2

ISU GPA to Percentage Converter

Convert your 4.0-scale ISU GPA to an equivalent percentage instantly.

Convert GPA → Percentage

Enter any ISU GPA between 0.0 and 4.0.

Your ISU GPA

The Conversion Formula

Iowa State uses a 4.0 scale, so:

\[ \text{Percentage} = \text{GPA} \times 25 \quad \text{or equivalently} \quad \text{Percentage} = \left(\frac{\text{GPA}}{4.0}\right) \times 100 \]

Example: If your GPA is 3.5, then Percentage = 3.5 × 25 = 87.50%.

Reference

Official ISU Grading Scale

Quality-point values used to compute semester and cumulative GPA, sourced from the Iowa State University Catalog.

📘 ISU Quality Points

Note: Iowa State has no A+; the top grade is A = 4.00, and failure is marked F.

Letter Grade	Quality Points	Definition
A	4.00	Excellent
A−	3.67	Excellent
B+	3.33	Good
B	3.00	Good
B−	2.67	Good
C+	2.33	Above Average
C	2.00	Average
C−	1.67	Below Average
D+	1.33	Passing
D	1.00	Passing
D−	0.67	Passing (lowest)
F	0.00	Failure

📌 Grades Excluded from GPA

The following marks carry no quality points and are not used in calculating the grade point average (though some may count toward degree requirements): S (Satisfactory), P (Pass), NP (Not Pass), T (test credit), W (Withdrawn), I (Incomplete), and N (No report).

An I (Incomplete) and N (No report) each convert to an F after one calendar year if unresolved.

Got Questions?

ISU GPA — Frequently Asked Questions

What GPA scale does Iowa State University use?

Iowa State uses a 4.0 quality-point scale: A = 4.00, A− = 3.67, B+ = 3.33, B = 3.00, B− = 2.67, C+ = 2.33, C = 2.00, C− = 1.67, D+ = 1.33, D = 1.00, D− = 0.67, and F = 0.00.

Does Iowa State have an A+ grade?

No. The highest grade at Iowa State is A (4.00). ISU does not award A+, so the maximum cumulative GPA is 4.00.

How do I convert my ISU GPA to a percentage?

Use Percentage = GPA × 25 (equivalent to (GPA ÷ 4.0) × 100). For example, a GPA of 3.5 converts to 87.5%.

Which grades are left out of my ISU GPA?

Grades of S, P, NP, and T are not counted in the GPA, though they may apply toward degree requirements. Marks of W, I, and N also carry no quality points.

What GPA do I need to graduate from Iowa State?

A cumulative GPA of 2.00 is required for a bachelor's degree. Graduation "with distinction" begins at a 3.50 cumulative GPA (Cum Laude 3.50–3.69, Magna Cum Laude 3.70–3.89, Summa Cum Laude 3.90+).

Reference: All grading data verified against the Iowa State University Catalog — Grading.