加重平均と単純平均の違いと注意点 | Grade Calcy
シラバスの配分割合が成績に与える大きな影響と、単純平均で計算してしまう危険性を比較解説。
Throughout your academic career, you encounter two fundamentally different methods of calculating performance: unweighted grading and weighted grading. Knowing which system your class uses is the difference between passing comfortably and receiving an unexpected lower grade on your transcript.
Comparing the Two Architectures
Every assessment has equal influence. A 90% on a 10-minute quiz shifts your overall course average by the exact same amount as a 90% on a four-hour comprehensive exam.
Best for: Elementary/middle school, low-stakes introductory electives.
Assessments are divided into weighted categories (e.g., Projects 20%, Tests 50%, Final 30%). High-stakes assessments carry proportional mathematical power.
Best for: High school AP/IB classes, university coursework, professional certification.
Weighted GPA vs. Weighted Course Grade
In high school, "weighted GPA" often refers to an extra point added for honors or Advanced Placement (AP) courses (e.g. an A in AP Biology equals 5.0 instead of 4.0). In college, however, "weighted grade" almost always refers to syllabus category percentages within a single course.
To calculate your current coursework accurately, use our 加重平均成績計算機 or switch to the 等比重（非加重）計算機 for equal-weight assignments.