Grade Point Average (GPA) is calculated by dividing total grade points earned by total credit hours attempted. The formula is: GPA = Σ(Grade Points × Credit Hours) / Σ(Credit Hours). Each letter grade corresponds to grade points: A = 4.0, B = 3.0, C = 2.0, D = 1.0, F = 0.0.

For example, if you take four courses: Biology (4 credits, A), English (3 credits, B+), Math (3 credits, B), and History (3 credits, A-), your calculation would be: (4×4.0 + 3×3.3 + 3×3.0 + 3×3.7) / (4+3+3+3) = (16 + 9.9 + 9 + 11.1) / 13 = 46 / 13 = 3.54 GPA.

Most US colleges use a 4.0 scale, but some use 5.0 scales or different point values. Graduate programs may not count grades below B, or may require a minimum 3.0 GPA. Always check your institution's specific policies on grade calculations and what's included in GPA.

Credit hours represent the workload of a course and significantly impact GPA calculation. A 4-credit course affects your GPA more than a 1-credit course. This is why performing well in high-credit courses is particularly important.

Most lecture courses are 3-4 credits. Lab courses often add 1-2 credits. Full-time enrollment is typically 12-18 credits per semester. A standard bachelor's degree requires 120 credits, while master's programs typically require 30-60 credits.

Strategic course selection can help manage GPA. A difficult course that you might earn a B in affects your GPA less if it's 2 credits than if it's 4 credits. Conversely, courses you excel in should ideally be worth more credits. However, academic requirements and your major often determine which courses you must take regardless of credit value.

Your cumulative GPA includes all college courses ever taken, while semester GPA covers only one term. Employers and graduate schools typically focus on cumulative GPA, though they may also look at trends in semester GPAs.

To calculate how a new semester will affect your cumulative GPA, combine previous totals with new grades. If you have 45 credits with a 3.2 GPA (144 grade points) and earn 15 credits with a 3.6 GPA (54 grade points), your new cumulative is (144 + 54) / (45 + 15) = 198 / 60 = 3.30 GPA.

Improving a low GPA takes time because cumulative GPA includes all credits. If you have a 2.5 GPA after 60 credits, earning a 4.0 for 30 more credits brings you to only 3.0 total. The more credits you've accumulated, the harder it is to move your GPA significantly. Use this calculator to project how your current courses will impact your GPA.