📏 英寸 ↔ 光年Inch to Light-year
英寸与光年互算（1 in = 2.68478211842e-18 ly）。本地换算，附常用相关单位。Convert inch and light-year (1 in = 2.68478211842e-18 ly). Runs locally with related units.
点击任意一行可复制该结果；小于 0.0001 或不小于 10¹⁵ 的数值用 × 10ⁿ 科学计数法显示Click any row to copy that result. Values below 0.0001 or at least 10¹⁵ are shown in × 10ⁿ notation
使用说明与常见问题How-to & FAQ
「英寸 ↔ 光年」是什么？What is the Inch to Light-year tool?
英寸与光年互算（1 in = 2.68478211842e-18 ly）。本地换算，附常用相关单位。Convert inch and light-year (1 in = 2.68478211842e-18 ly). Runs locally with related units.
如何使用「英寸 ↔ 光年」？How do I use the Inch to Light-year tool?
在「英寸 ↔ 光年」中输入数值并选择原单位，表格会同时列出换算到所有其他单位的结果，可一键复制。Enter a value in the Inch to Light-year and choose the source unit; the table shows the value in every other unit at once, ready to copy.
1 英寸等于多少光年？How many light-year in 1 inch?
1 in = 2.68478211842e-18 ly（按国际定义系数）。1 in = 2.68478211842e-18 ly (international definition).
如何把英寸换算成光年？How do I convert inch to light-year?
结果 = 数值 × 2.68478211842e-18。例如 3.72469703645e+17 in = 1 ly。result = value × 2.68478211842e-18. Example: 3.72469703645e+17 in = 1 ly.
英寸/光年属于哪类单位？What kind of units are inch/light-year?
二者同属「长度」量纲，可安全互算；也可打开「length-converter」做多单位对照。Both are length units; see also the length converter hub.
换算系数准确吗？Are the conversion factors exact?
「英寸 ↔ 光年」采用国际单位制（SI）或公认标准中的定义值作为换算系数，结果保留约 10 位有效数字。The Inch to Light-year uses factors defined by the SI or other recognised standards and shows about 10 significant digits.
「英寸 ↔ 光年」免费吗？需要注册吗？Is the Inch to Light-year free? Do I need an account?
「英寸 ↔ 光年」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 Inch to Light-year is completely free with no sign-up or install and works on phones and desktops; what you enter is processed only in your browser.