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📐 屋顶坡度计算器Roof Pitch Calculator
由升高和水平跨度计算屋顶坡度（x/12）、角度、百分比坡度和坡度系数，也可由角度反算。Find roof pitch (x/12), angle, percent grade and multiplier from rise and run, or from an angle.
使用说明与常见问题How-to & FAQ
「屋顶坡度计算器」是什么？What is the Roof Pitch Calculator tool?
由升高和水平跨度计算屋顶坡度（x/12）、角度、百分比坡度和坡度系数，也可由角度反算。Find roof pitch (x/12), angle, percent grade and multiplier from rise and run, or from an angle.
如何使用「屋顶坡度计算器」？How do I use the Roof Pitch Calculator tool?
在「屋顶坡度计算器」中，填写「已知」、「升高」、「水平跨度」、「角度(°)」等参数，结果会随输入实时计算并显示在下方。In the Roof Pitch Calculator: Fill in "Given", "Rise", "Run", "Angle (°)"; results are recalculated instantly as you type.
4/12 坡度是多少度？What angle is a 4/12 pitch?
4/12 表示每水平 12 英寸升高 4 英寸，角度 = arctan(4/12) ≈ 18.43°。4/12 means 4 inches of rise per 12 inches of run: arctan(4/12) ≈ 18.43°.
「屋顶坡度计算器」免费吗？需要注册吗？Is the Roof Pitch Calculator free? Do I need an account?
「屋顶坡度计算器」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 Roof Pitch 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.