How to calculate your grade
- In Weighted grade, enter each graded category (homework, quizzes, midterm…) with your score as a percentage and its weight from the syllabus.
- Your current weighted average and letter grade appear below. If not everything has been graded yet, the result is scaled to the weights entered so far.
- In What do I need on the final?, enter your current grade, how much the final exam is worth and the grade you want.
The formulas
A weighted grade is Σ(score × weight) ÷ Σ(weights). With homework 92% (20%), quizzes 85% (20%) and a midterm 78% (25%), the grade so far is (92×20 + 85×20 + 78×25) ÷ 65 = 84.46%.
The score needed on the final is (target − current × (1 − w)) ÷ w, where w is the final's weight as a decimal. With 84% now, a final worth 30% and a target of 90%, you need (90 − 84 × 0.7) ÷ 0.3 = 104%: not possible without extra credit, while a target of 85% needs only 87.3%.
Letter grades use the common US scale (93+ A, 90–92 A−, 87–89 B+ and so on). Your school may draw the lines differently or round, so check the syllabus. Points-based courses can be entered as percentages by dividing points earned by points possible. Your entries are saved in this browser only.
What if my weights don't add up to 100%?
That usually means some work is not graded yet. The calculator divides by the weights you entered, giving your grade on the work completed so far.
How much will the final affect my grade?
Each point on the final changes your course grade by the final's weight. On a 30% final, 10 extra points on the exam add 3 points to your grade.
Can I use it for points instead of percentages?
Yes: convert each category to a percentage (points earned ÷ points possible × 100) and use its share of the total points as the weight.