🟩 圆毫米 ↔ 圆英寸Circular millimetre to Circular inch
圆毫米与圆英寸互算（1 circ mm = 0.00155000310001 circ in）。本地换算，附常用相关单位。Convert circular millimetre and circular inch (1 circ mm = 0.00155000310001 circ in). 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
「圆毫米 ↔ 圆英寸」是什么？What is the Circular millimetre to Circular inch tool?
圆毫米与圆英寸互算（1 circ mm = 0.00155000310001 circ in）。本地换算，附常用相关单位。Convert circular millimetre and circular inch (1 circ mm = 0.00155000310001 circ in). Runs locally with related units.
如何使用「圆毫米 ↔ 圆英寸」？How do I use the Circular millimetre to Circular inch tool?
在「圆毫米 ↔ 圆英寸」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 Circular millimetre to Circular inch and choose the source unit; the table shows the value in every other unit at once, ready to copy.
1 圆毫米等于多少圆英寸？How many circular inch in 1 circular millimetre?
1 circ mm = 0.00155000310001 circ in（按国际定义系数）。1 circ mm = 0.00155000310001 circ in (international definition).
如何把圆毫米换算成圆英寸？How do I convert circular millimetre to circular inch?
结果 = 数值 × 0.00155000310001。例如 1 circ mm = 0.00155000310001 circ in。result = value × 0.00155000310001. Example: 1 circ mm = 0.00155000310001 circ in.
圆毫米/圆英寸属于哪类单位？What kind of units are circular millimetre/circular inch?
二者同属「面积」量纲，可安全互算；也可打开「area-converter」做多单位对照。Both are area units; see also the area converter hub.
换算系数准确吗？Are the conversion factors exact?
「圆毫米 ↔ 圆英寸」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 Circular millimetre to Circular inch uses factors defined by the SI or other recognised standards and shows about 10 significant digits.
「圆毫米 ↔ 圆英寸」免费吗？需要注册吗？Is the Circular millimetre to Circular inch free? Do I need an account?
「圆毫米 ↔ 圆英寸」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 Circular millimetre to Circular inch is completely free with no sign-up or install and works on phones and desktops; what you enter is processed only in your browser.