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Calculate current class grade percentage, weighted category averages (homework, quizzes, exams, labs), and determine the exact score needed on the final exam to secure your target letter grade.
g_i and their respective weights w_i: G_{ ext{current}} = rac{sum (w_i imes g_i)}{sum w_i}.W_{ ext{done}} = sum w_i. The final exam weight is W_{ ext{final}} = 100% - W_{ ext{done}}.G_{ ext{target}}: G_{ ext{final}} = rac{G_{ ext{target}} - left(G_{ ext{current}} imes rac{W_{ ext{done}}}{100}
ight)}{ rac{W_{ ext{final}}}{100}}.G_{ ext{final}} > 100%, extra credit is required. If G_{ ext{final}} le 0%, the target grade is already mathematically locked.If the calculated required score exceeds 100%, it means that even a perfect score on the final exam will not produce enough total weighted points to reach your target letter grade without additional extra credit or an instructor grading curve.
In a total points system, divide total points earned by total points possible (e.g. 450 / 500 = 90%). In a weighted category system, individual assignment points are normalized to percentages within their category before applying category weights.
Many professors drop the lowest quiz or homework score. To calculate accurately, eliminate your lowest percentage score from that category and recalculate the category average across the remaining assignments before applying category weight.
Grading curves adjust raw percentages upward (e.g. adding a flat +5% boost, scaling the highest student score to 100%, or fitting scores to a Gaussian bell curve). If a curve is anticipated, subtract the estimated curve percentage from your target grade in the formula.