GPA Calculator — Complete Guide
Grade point average compresses a whole term of results into a single number. The catch is the word "average" — it is not the plain average of your grades, but a credit-weighted one, so a five-credit course swings the result far more than a one-credit lab.
What this calculator does
Enter credits and grade points for up to six courses. Rows you leave blank are skipped, so you can use it for a full term or a single semester. It returns the weighted GPA, the total credits and the unweighted average for comparison.
The formula
GPA = Σ (grade points × credits) ÷ Σ credits
The grade points come from your institution's scale — the common US one runs A = 4.0, A− = 3.7, B+ = 3.3, B = 3.0, down to F = 0.
A worked example
Four courses: a 3-credit A (4.0), a 4-credit B+ (3.3), a 3-credit A− (3.7) and a 1-credit B (3.0). Grade points are 12.0 + 13.2 + 11.1 + 3.0 = 39.3 over 11 credits, so the GPA is 39.3 ÷ 11 = 3.57. The unweighted average of 3.5 would overstate nothing here but misleads whenever course sizes differ.
| Grade | Points | Grade | Points |
|---|
| A | 4.0 | C+ | 2.3 |
| A− | 3.7 | C | 2.0 |
| B+ | 3.3 | D | 1.0 |
| B | 3.0 | F | 0.0 |
Weighted vs unweighted GPA
- Unweighted caps every course at 4.0, so an honours class counts the same as an easy elective.
- Weighted awards extra points (often +0.5 or +1.0) for advanced courses, so a 5.0 scale is possible.
- Schools differ. Always check whether your institution uses a 4.0 or 5.0 ceiling before comparing.
- Credit weight matters. A single 1-credit A cannot rescue a poor grade in a 4-credit course.
GPA 计算器完整使用指南
绩点（GPA）把一个学期的成绩压缩成一个数字。关键在于「平均」这两个字 —— 它不是成绩的简单平均，而是按学分加权的平均，所以一门 5 学分的课对结果的影响远大于一门 1 学分的实验课。
这个计算器能做什么
为最多六门课填写学分与绩点。留空的行会被跳过，因此既可以算一整个学期，也可以只算某一门。结果包含加权 GPA、总学分，以及便于对照的未加权平均值。
计算公式
GPA = Σ (绩点 × 学分) ÷ Σ 学分
绩点取自你所在学校的换算表 —— 常见的美国体系为 A = 4.0、A− = 3.7、B+ = 3.3、B = 3.0，依此类推到 F = 0。
算例演示
四门课：3 学分 A（4.0）、4 学分 B+（3.3）、3 学分 A−（3.7）、1 学分 B（3.0）。累计绩点 = 12.0 + 13.2 + 11.1 + 3.0 = 39.3，总学分 11，因此 GPA = 39.3 ÷ 11 = 3.57。若用未加权平均 3.5，在这里差别不大，但一旦各课学分不同就会失真。
| 等级 | 绩点 | 等级 | 绩点 |
|---|
| A | 4.0 | C+ | 2.3 |
| A− | 3.7 | C | 2.0 |
| B+ | 3.3 | D | 1.0 |
| B | 3.0 | F | 0.0 |
加权 GPA 与未加权 GPA
- 未加权把所有课程封顶在 4.0，因此荣誉课程与轻松的选修课权重相同。
- 加权会给进阶课程额外加分（常见 +0.5 或 +1.0），因此可能出现 5.0 制。
- 各校不同。 比较之前先确认你所在学校用的是 4.0 还是 5.0 上限。
- 学分权重很关键。 一门 1 学分的 A 无法挽救一门 4 学分课的低分。