🌡️ 英热单位能量换算British Thermal Unit Converter
BTU 与焦耳、卡路里、千瓦时换算。支持英热单位、焦耳、千焦、卡路里（国际蒸汽表）、千卡、千瓦时、therms互算。Convert BTU to joules, calories and kilowatt-hours. Units: British thermal unit, joule, kilojoule, calorie (IT), kilocalorie, kilowatt-hour, therm.
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
「英热单位能量换算」是什么？What is the British Thermal Unit Converter tool?
BTU 与焦耳、卡路里、千瓦时换算。支持英热单位、焦耳、千焦、卡路里（国际蒸汽表）、千卡、千瓦时、therms互算。Convert BTU to joules, calories and kilowatt-hours. Units: British thermal unit, joule, kilojoule, calorie (IT), kilocalorie, kilowatt-hour, therm.
如何使用「英热单位能量换算」？How do I use the British Thermal Unit Converter tool?
在「英热单位能量换算」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 British Thermal Unit Converter and choose the source unit; the table shows the value in every other unit at once, ready to copy.
用的是哪种 BTU？Which BTU definition is used?
使用国际蒸汽表 BTU（BTU_IT），1 BTU ≈ 1055.06 J。另有热化学 BTU 约 1054.35 J，两者相差不到 0.1%。It uses the International Table BTU (BTU_IT), 1 BTU ≈ 1055.06 J. The thermochemical BTU is about 1054.35 J; the two differ by less than 0.1%.
1 英热单位 等于多少其他单位？How much is 1 British thermal unit in the other units?
1 英热单位 = 1055.055853 焦耳 = 1.055055853 千焦 = 251.9957611 卡路里（国际蒸汽表） = 0.2519957611 千卡 = 0.0002930710702 千瓦时 = 1 × 10^-5 therms（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 British thermal unit = 1055.055853 joule = 1.055055853 kilojoule = 251.9957611 calorie (IT) = 0.2519957611 kilocalorie = 0.0002930710702 kilowatt-hour = 1 × 10^-5 therm (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?
「英热单位能量换算」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 British Thermal Unit Converter — "Value" default 1. The result always uses the current settings.
换算系数准确吗？Are the conversion factors exact?
「英热单位能量换算」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 British Thermal Unit Converter uses factors defined by the SI or other recognised standards and shows about 10 significant digits.
「英热单位能量换算」免费吗？需要注册吗？Is the British Thermal Unit Converter free? Do I need an account?
「英热单位能量换算」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 British Thermal Unit Converter is completely free with no sign-up or install and works on phones and desktops; what you enter is processed only in your browser.