🏟️ 美式足球场 ↔ 光日Football field (100 yd) to Light-day
美式足球场与光日互算（1 ffld = 3.530220008e-12 light-d）。本地换算，附常用相关单位。Convert football field (100 yd) and light-day (1 ffld = 3.530220008e-12 light-d). 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
「美式足球场 ↔ 光日」是什么？What is the Football field (100 yd) to Light-day tool?
美式足球场与光日互算（1 ffld = 3.530220008e-12 light-d）。本地换算，附常用相关单位。Convert football field (100 yd) and light-day (1 ffld = 3.530220008e-12 light-d). Runs locally with related units.
如何使用「美式足球场 ↔ 光日」？How do I use the Football field (100 yd) to Light-day tool?
在「美式足球场 ↔ 光日」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 Football field (100 yd) to Light-day and choose the source unit; the table shows the value in every other unit at once, ready to copy.
1 美式足球场等于多少光日？How many light-day in 1 football field (100 yd)?
1 ffld = 3.530220008e-12 light-d（按国际定义系数）。1 ffld = 3.530220008e-12 light-d (international definition).
如何把美式足球场换算成光日？How do I convert football field (100 yd) to light-day?
结果 = 数值 × 3.530220008e-12。例如 283268464300 ffld = 1 light-d。result = value × 3.530220008e-12. Example: 283268464300 ffld = 1 light-d.
美式足球场/光日属于哪类单位？What kind of units are football field (100 yd)/light-day?
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?
「美式足球场 ↔ 光日」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 Football field (100 yd) to Light-day uses factors defined by the SI or other recognised standards and shows about 10 significant digits.
「美式足球场 ↔ 光日」免费吗？需要注册吗？Is the Football field (100 yd) to Light-day free? Do I need an account?
「美式足球场 ↔ 光日」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 Football field (100 yd) to Light-day is completely free with no sign-up or install and works on phones and desktops; what you enter is processed only in your browser.