⚖️ 比例计算器Ratio Calculator
解比例方程 A:B = C:X，化简比例，按比例缩放尺寸（如 16:9）。Solve A:B = C:X, simplify ratios and scale dimensions (e.g. 16:9).
使用说明与常见问题How-to & FAQ
「比例计算器」是什么？What is the Ratio Calculator?
解比例方程 A:B = C:X，化简比例，按比例缩放尺寸（如 16:9）。Solve A:B = C:X, simplify ratios and scale dimensions (e.g. 16:9).
如何使用「比例计算器」？How do I use the Ratio Calculator?
在「比例计算器」中，填写「A」、「B」、「C」、「D (留空求解)」等参数，结果会随输入实时计算并显示在下方。In the Ratio Calculator: Fill in "A", "B", "C", "D (blank to solve)"; results are recalculated instantly as you type.
计算精度如何？How precise are the results?
「比例计算器」使用 JavaScript 双精度浮点数（约 15–16 位有效数字）；极大或极小的数值可能存在精度误差。The Ratio Calculator uses double-precision floating point (about 15–16 significant digits); very large or very small values may lose precision.
「比例计算器」免费吗？需要注册吗？Is the Ratio Calculator free? Do I need an account?
「比例计算器」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 Ratio 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.