Single Grade GPA Impact Calculator
Calculate how one grade will change your cumulative GPA.
See exactly what grade you need to hit your target GPA.
Understanding how a single grade affects your overall GPA helps you prioritize your efforts. A B in a 4-credit course has more impact than an A in a 1-credit course — this calculator quantifies exactly how much any single grade will move your GPA.
How GPA is calculated: GPA = Sum of (Grade Points × Credit Hours) / Total Credit Hours Attempted
Grade points on the standard 4.0 scale:
- A+ = 4.0 (some schools: 4.3)
- 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
- F = 0.0
The impact formula: New GPA = (Current GPA × Current Credits + New Grade Points × New Course Credits) / (Current Credits + New Course Credits)
Example: Current GPA: 3.2 over 45 credits New course: 3 credits, grade B (3.0 points) New GPA = (3.2 × 45 + 3.0 × 3) / (45 + 3) = (144 + 9) / 48 = 153 / 48 = 3.1875 ≈ 3.19
Key insight: The more credits you’ve already accumulated, the smaller the impact of any single course. If you have 120 credits completed and add one 3-credit course, that course represents only 2.4% of your total credits — it can only move your GPA by a small amount in either direction. Conversely, early in your academic career, each course matters more.
What GPA do you need? This calculator also helps you figure out what grade you need in the current course to achieve a specific target GPA.