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How GPA is calculated
GPA is a weighted average too, except credits are the weights. A 4-credit class moves your GPA more than a 1-credit class.
The formula
GPA = Total grade points ÷ Total credits
For each class, multiply its credits by the points for your letter grade. An A- in a 3-credit class gives you 3 × 3.7, or 11.1 grade points.
Why it gets harder to move
With 60 credits behind you, 15 new credits make up only a fifth of the total. Early semesters move your GPA the most.