Assignment
Grade (%)
Weight (%)
Final Grade Planner
Find out what score you need on the remaining work to reach your desired grade.
Find out what score you need on the remaining work to reach your desired grade.
In a weighted grading system, each assignment or category contributes a different proportion to your final course grade. A professor might assign homework 20% of the overall weight, quizzes 10%, a midterm exam 30%, and a final exam 40%. This means a perfect score on homework has far less impact on your final grade than a perfect score on the final exam. Weighted grading reflects the idea that some assessments are more comprehensive or important than others, and it gives instructors flexibility to emphasize mastery of key material.
To calculate a weighted grade, multiply each assignment's percentage score by its weight, sum those products, and then divide by the total weight. For example, if you earned 90% on homework (weight 20) and 80% on a midterm (weight 30), the weighted sum is (90 × 20) + (80 × 30) = 4,200, and dividing by the total weight of 50 gives a weighted average of 84%. If all weights add up to 100, the division step simply confirms the total. When weights do not sum to 100, the calculator normalizes them so the result still reflects a percentage out of 100.
| Letter | GPA | Percentage |
|---|---|---|
| A+ | 4.0 | 97–100% |
| A | 4.0 | 93–96% |
| A- | 3.7 | 90–92% |
| B+ | 3.3 | 87–89% |
| B | 3.0 | 83–86% |
| B- | 2.7 | 80–82% |
| C+ | 2.3 | 77–79% |
| C | 2.0 | 73–76% |
| C- | 1.7 | 70–72% |
| D+ | 1.3 | 67–69% |
| D | 1.0 | 63–66% |
| D- | 0.7 | 60–62% |
| F | 0.0 | 0–59% |
Yale University was among the first American institutions to formally rank student performance, adopting a system in 1785 that used Latin descriptors such as optimi (the best) and inferiores (the lesser) to sort students into tiers. Other colleges experimented with numerical scales, merit points, and class rankings throughout the 1800s. The letter grade system as we recognize it today traces back to Mount Holyoke College, which in 1887 began assigning letters A through E to student work, with E denoting failure. The familiar F replaced E at most schools within a few decades, and by the early twentieth century the A-through-F scale had become the dominant framework in American education.
Despite their widespread use, letter grades have never been truly universal. Some universities, including several Ivy League schools, experimented with honors/pass/fail systems during the mid-twentieth century. Today, a handful of institutions such as Reed College, Hampshire College, and parts of the University of California system still rely on narrative evaluations or pass/no-pass marks for certain courses. Internationally, grading conventions vary even more widely: the United Kingdom uses a classification system of firsts, upper seconds, and lower seconds for degrees, while many European countries grade on numeric scales ranging from 1 to 10 or 1 to 20. Still, the American letter grade remains one of the most widely recognized academic shorthand systems in the world.