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🎓 成绩计算器Grade Calculator
按各项作业/考试的得分与权重计算加权总评成绩，并换算成美式字母等级（A+ 到 F）。Weighted course grade from assignment and exam scores and weights, with the US letter grade (A+ to F).
使用说明与常见问题How-to & FAQ
「成绩计算器」是什么？What is the Grade Calculator tool?
按各项作业/考试的得分与权重计算加权总评成绩，并换算成美式字母等级（A+ 到 F）。Weighted course grade from assignment and exam scores and weights, with the US letter grade (A+ to F).
如何使用「成绩计算器」？How do I use the Grade Calculator tool?
在「成绩计算器」中，填写上方字段等参数，结果会随输入实时计算并显示在下方。In the Grade Calculator: Fill in the fields above; results are recalculated instantly as you type.
字母等级怎么划分？How are letter grades assigned?
采用美国常见的 +/− 等级：A+ ≥ 97，A 93–96.99，A− 90–92.99，B+ 87–89.99 … D− 60–62.99，60 以下为 F。各校标准可能不同。Common US +/− cutoffs: A+ ≥ 97, A 93–96.99, A− 90–92.99, B+ 87–89.99 … D− 60–62.99, below 60 is F. Schools may differ.
权重总和必须是 100 吗？Must weights add up to 100?
不必。本工具按权重比例计算，例如只填了已出分的项目（权重共 60），得到的是目前的加权平均。No. Weights are used proportionally, so if only graded items (say 60% of the course) are entered you get your current weighted average.
「成绩计算器」免费吗？需要注册吗？Is the Grade Calculator free? Do I need an account?
「成绩计算器」完全免费，无需注册或安装，打开网页即可使用，手机和电脑都能用；输入的内容只在你的浏览器本地处理。The Grade Calculator is completely free with no sign-up or install and works on phones and desktops; what you enter is processed only in your browser.