Purdue GPA Calculator
Estimate your semester GPA and projected cumulative GPA using Purdue's 4.0 scale.
Tip: Fill in both optional fields to project your new cumulative GPA after this semester.
How this Purdue GPA calculator works
Your GPA (grade point average) is a weighted average based on credit hours. That means a 4-credit class affects your GPA more than a 1-credit seminar. This calculator multiplies each course's credits by the grade points for your letter grade, adds everything together, and then divides by total graded credits.
Semester GPA = (Sum of (Course Credits × Grade Points)) ÷ (Total Graded Credits)
This page is designed for quick planning: before finals, during registration, or when you're deciding whether to retake a class.
Purdue 4.0 grade scale (common format)
Use this typical 4.0 mapping:
- A+ / A = 4.0
- A- = 3.7
- B+ = 3.3
- B = 3.0
- B- = 2.7
- C+ = 2.3
- C = 2.0
- C- = 1.7
- D+ = 1.3
- D = 1.0
- D- = 0.7
- F = 0.0
Always verify special grading policies (pass/no-pass, withdrawals, repeats, transfer credit) in your official Purdue records and academic catalog.
Semester GPA vs cumulative GPA
Semester GPA
Semester GPA includes only classes from one term. It's useful for tracking short-term academic performance and seeing whether study changes are working.
Cumulative GPA
Cumulative GPA includes all applicable graded coursework in your academic history. If you enter your current cumulative GPA and completed GPA credits in the calculator, you can estimate your updated cumulative result after this semester.
How to use the calculator effectively
- Enter each class and its credit hours.
- Select your expected or final letter grade.
- Use Add Course for labs, mini-courses, and electives.
- Click Calculate GPA to view semester results.
- Add previous cumulative data to project overall GPA changes.
Example: quick GPA estimate
Suppose you take four courses: 4, 3, 3, and 1 credits with grades A, B+, B, and A-. Quality points would be:
- 4 × 4.0 = 16.0
- 3 × 3.3 = 9.9
- 3 × 3.0 = 9.0
- 1 × 3.7 = 3.7
Total quality points = 38.6, total credits = 11, so semester GPA = 38.6 ÷ 11 = 3.509.
Ways to improve your Purdue GPA
1) Prioritize high-credit classes
A one-letter-grade improvement in a 4-credit class can shift GPA much more than in a 1-credit class.
2) Monitor your standing weekly
Recalculate your expected GPA after each major exam or project so there are no surprises at term end.
3) Get help early
Office hours, SI sessions, tutoring, and study groups can turn borderline grades into solid outcomes.
4) Build realistic schedules
Balance difficult technical courses with classes where you can maintain strong performance.
Important notes
- This tool provides an unofficial estimate.
- Institutional policies can affect what counts toward GPA.
- Repeated course rules and grade replacement may vary by program and year.
- For financial aid or graduation decisions, rely on official Purdue systems and advisors.
Final takeaway
A good Purdue GPA calculator is not just for the end of the semester. Use it as a planning tool throughout the term to make smarter decisions about effort, course load, and grade goals. Small improvements in multiple classes can create a large cumulative impact over time.