🛣️ 千米 ↔ 天文单位Kilometre to Astronomical unit
千米与天文单位互算（1 km = 6.68458712227e-09 au）。本地换算，附常用相关单位。Convert kilometre and astronomical unit (1 km = 6.68458712227e-09 au). 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
「千米 ↔ 天文单位」是什么？What is the Kilometre to Astronomical unit tool?
千米与天文单位互算（1 km = 6.68458712227e-09 au）。本地换算，附常用相关单位。Convert kilometre and astronomical unit (1 km = 6.68458712227e-09 au). Runs locally with related units.
如何使用「千米 ↔ 天文单位」？How do I use the Kilometre to Astronomical unit tool?
在「千米 ↔ 天文单位」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 Kilometre to Astronomical unit and choose the source unit; the table shows the value in every other unit at once, ready to copy.
1 千米等于多少天文单位？How many astronomical unit in 1 kilometre?
1 km = 6.68458712227e-09 au（按国际定义系数）。1 km = 6.68458712227e-09 au (international definition).
如何把千米换算成天文单位？How do I convert kilometre to astronomical unit?
结果 = 数值 × 6.68458712227e-09。例如 149597870.7 km = 1 au。result = value × 6.68458712227e-09. Example: 149597870.7 km = 1 au.
千米/天文单位属于哪类单位？What kind of units are kilometre/astronomical unit?
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?
「千米 ↔ 天文单位」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 Kilometre to Astronomical unit uses factors defined by the SI or other recognised standards and shows about 10 significant digits.
「千米 ↔ 天文单位」免费吗？需要注册吗？Is the Kilometre to Astronomical unit free? Do I need an account?
「千米 ↔ 天文单位」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 Kilometre to Astronomical unit is completely free with no sign-up or install and works on phones and desktops; what you enter is processed only in your browser.