⚡ 焦耳 ↔ 千焦Joules to Kilojoules
1 kJ = 1000 J。支持焦耳、千焦、卡路里、千瓦时互算。1 kJ = 1,000 J. Units: joule, kilojoule, calorie, kilowatt-hour.
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
「焦耳 ↔ 千焦」是什么？What is the Joules to Kilojoules tool?
1 kJ = 1000 J。支持焦耳、千焦、卡路里、千瓦时互算。1 kJ = 1,000 J. Units: joule, kilojoule, calorie, kilowatt-hour.
如何使用「焦耳 ↔ 千焦」？How do I use the Joules to Kilojoules tool?
在「焦耳 ↔ 千焦」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 Joules to Kilojoules and choose the source unit; the table shows the value in every other unit at once, ready to copy.
焦耳和千焦是什么关系？How do joules and kilojoules relate?
1 千焦 = 1000 焦耳。焦耳是国际单位制的能量导出单位（1 J = 1 N·m）。食品标签常用千焦，1 千卡 ≈ 4.184 千焦。1 kJ = 1,000 J. The joule is the SI derived unit of energy (1 J = 1 N·m). Food labels often use kJ, and 1 kcal ≈ 4.184 kJ.
1 焦耳 等于多少其他单位？How much is 1 joule in the other units?
1 焦耳 = 0.001 千焦 = 0.2390057361 卡路里 = 2.777777778 × 10^-7 千瓦时（按定义系数计算，最多保留 10 位有效数字）。本页不接受负数：输入负值会提示错误。1 joule = 0.001 kilojoule = 0.2390057361 calorie = 2.777777778 × 10^-7 kilowatt-hour (from the defined factors, up to 10 significant digits). Negative values are not accepted here and show an error.
有哪些选项可以调整？What options can I adjust?
「焦耳 ↔ 千焦」的设置：「数值」默认 1。每次生成结果都按当前设置处理。Settings in the Joules to Kilojoules — "Value" default 1. The result always uses the current settings.
换算系数准确吗？Are the conversion factors exact?
「焦耳 ↔ 千焦」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 Joules to Kilojoules uses factors defined by the SI or other recognised standards and shows about 10 significant digits.
「焦耳 ↔ 千焦」免费吗？需要注册吗？Is the Joules to Kilojoules free? Do I need an account?
「焦耳 ↔ 千焦」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 Joules to Kilojoules is completely free with no sign-up or install and works on phones and desktops; what you enter is processed only in your browser.