Menu
Buy me a coffeePayPal
OmniTools
Omni News

Convert between energy units instantly. Our free online energy converter supports joules, calories, kilowatt-hours, BTU, and more with precise, real-time results.

单位类别

货币
时区
长度和距离
重量和质量
温度
面积
体积
时间
速度
压力
功率
能量
力
薪资与工资
数字存储
频率
照度
字体排印
Image Resolution
Angle
电流
燃油消耗
鞋码
服装尺码

能量 Converter

免费能量转换器, 即时换算焦耳、卡路里、千瓦时和英热单位

使用 OmniConverter 免费在线能量换算器在焦耳、卡路里、千瓦时和英热单位之间即时换算。1 千瓦时等于 3.6 百万焦耳，1 卡路里等于 4.184 焦耳，1 千卡等于 1,000 卡路里。无论你是计算营养标签、电费还是物理问题，都能获得精确的结果。

使用方法

通过三个简单步骤进行转换。

1

输入能量值

2

选择源能量单位与目标单位

3

查看转换后的能量值

热门能量换算

Calories 至 JoulesJoules 至 CaloriesKilocalories 至 KilojoulesKilojoules 至 KilocaloriesWatt-hours 至 JoulesJoules 至 Watt-hoursKilowatt-hours 至 JoulesJoules 至 Kilowatt-hoursKilojoules 至 JoulesJoules 至 KilojoulesKilocalories 至 CaloriesCalories 至 KilocaloriesKilowatt-hours 至 Watt-hoursWatt-hours 至 Kilowatt-hoursKilowatt-hours 至 KilojoulesKilojoules 至 Kilowatt-hoursCalories 至 KilojoulesKilojoules 至 CaloriesKilocalories 至 JoulesJoules 至 KilocaloriesWatt-hours 至 KilocaloriesKilocalories 至 Watt-hoursKilowatt-hours 至 KilocaloriesKilocalories 至 Kilowatt-hours

常用基准

参考

1 J → J

1 J

参考

1 J → kJ

0.001 kJ

参考

1 J → cal

0.2390057361 cal

参考

1 J → kcal

0.0002390057 kcal

参考

1 J → Wh

0.0002777778 Wh

参考

1 J → kWh

2.777778e-7 kWh

实际应用场景

中国的电费账单以千瓦时（度）计算, 一个普通家庭月用电量约200-300度（kWh）。阶梯电价政策下，超过一定度数后单价提高，所以了解每日用电量很重要。食品营养标签上同时标注千卡（kcal）和千焦（kJ）, 一个馒头约220kcal，一大碗米饭约260kcal。1 kcal = 4.184 kJ，消费者在比较国产和进口食品时需要换算。健身人群关注运动消耗：跑步1小时约消耗500-600kcal。加油站：92号汽油的热值约32 MJ/L。可再生能源方面，中国风电和光伏装机量以GW计（全球最大），户用光伏系统年发电量约5,000-10,000 kWh。在物理课堂上，学生做热力学计算时在焦耳、卡路里和千瓦时之间频繁转换。供暖方面，北方集中供暖按建筑面积收费，但热力公司按GJ（吉焦）或kWh计量。电动车电池容量以kWh表示, 比亚迪汉的刀片电池77 kWh。

Embed this converter on your site

Free, responsive, no sign-up required. Just paste a snippet.

Get Embed Code

常见问题

常见换算问题的快速解答

一度电是多少kWh？+

一度电（中国标准）等于1 kWh。家庭月均用电约200-300 kWh。

食物热量如何换算？+

1千卡（大卡）≈ 4.184千焦（kJ）。一碗米饭约200大卡。

如何将kWh换算成焦耳？+

kWh乘以3,600,000即可得到焦耳。

如何将卡路里换算成千焦？+

卡路里乘以4.184即可得到千焦。

什么是千卡和卡的区别？+

1千卡（大卡）= 1,000卡。营养标签上的卡实际是千卡。

如何将焦耳换算成卡路里？+

焦耳乘以0.239即可得到卡路里。

中国家庭电费按什么计费？+

中国家庭电费按kWh计费，居民电价约0.5-0.8元/kWh，阶梯电价。

Latest Blog Posts

Tips, guides, and insights about unit conversions

View all posts

Quick Answer: 能量 Converter

Convert 能量 instantly — enter any value and get all units at once. Common energy conversions include joules to calories (1 J = 0. Energy conversion is essential for nutrition labeling, electricity billing, physics calculations, and engineering applications.

How the 能量 Converter Works

Our energy converter uses precise conversion factors to convert between joules, calories, kilowatt-hours, BTU, electronvolts, and other energy units.

Formula & Sources

Joule is SI (N·m). Calorie = 4.184 J thermochemical (NIST); kWh = 3.6 MJ exact.

Worked Example

Example: 2000 kcal (food) = 8.368 MJ = 2.324 kWh. 1 kWh = 860.42 kcal.

Common 能量 Conversions

Common energy conversions include joules to calories (1 J = 0.239 cal), kilowatt-hours to joules (1 kWh = 3.6 MJ), and BTU to joules (1 BTU = 1055 J).

When to Use 能量 Conversion

Energy conversion is essential for nutrition labeling, electricity billing, physics calculations, and engineering applications.

Accuracy & Common Mistakes

All factors are stored unrounded and computed in double precision. We avoid cumulative rounding by converting via a base unit. Always verify critical results with a second source for safety-critical tasks.

Frequently Asked Questions

How many calories in a kWh?

1 kWh = 860,420 cal (860.4 kcal) = 3.6 MJ.

Is a food Calorie the same as a physics calorie?

Food Calorie (large C) = 1 kcal = 1,000 small calories = 4,184 J.

What is a BTU in joules?

1 BTU (ISO) = 1,055.06 J. Useful for HVAC: 12,000 BTU/h = 1 ton of cooling.

Popular Energy comparisons

Jump directly to a side-by-side comparison — no typing needed. Also discoverable via search.

Joule → Kilojoule→Joule → Calorie→Joule → Kilocalorie→Joule → Watt-hour→Kilojoule → Calorie→Kilojoule → Kilocalorie→
View all comparisons

Related Converters

功率温度

People Also Ask