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能量转换器
免费能量转换器 — 焦耳、千焦耳、千瓦时、卡路里、千卡路里、BTU和电子伏特。适用于物理学、营养学和工程学。
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编辑注
Understanding · Heat, work, electricity — all the same thing.
本深度章节目前仅有英文版本。上方的转换工具支持您的语言;长篇说明文章尚未翻译。
常见问题
Quick answers.
›Calorie or kilocalorie on food labels?
On food labels in the US the 'Calorie' (capital C) is actually a kilocalorie (1,000 small calories). Most other countries label them as kcal or kJ to avoid confusion.
›How much is 1 kWh?
1 kilowatt-hour = 3.6 million joules. It's the energy you'd use running a 1,000 W appliance (like a microwave) for one hour.
›What's a BTU?
A British Thermal Unit is the energy needed to heat one pound of water by 1 °F — about 1,055 joules. Used widely in HVAC and heating ratings.
›Is the converter free?
Yes — free, no signup, runs in your browser.
›How precise are the conversions?
Double-precision floats — accurate to 15 significant digits, well past anything you'll need in practice.
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