Home › Unit Converters › Energy
Energy Converter — J, kJ, cal, kWh, BTU
Type a value in any box — every other unit updates instantly.
Type a value in any box — all other units update instantly.
Energy Conversion Table
| Unit | Equals |
|---|---|
| 1 joule (J) (base) | 1 J |
| 1 kilojoule (kJ) | 1000 J |
| 1 calorie (cal) | 4.184 J |
| 1 kilocalorie (kcal) | 4184 J |
| 1 watt-hour (Wh) | 3600 J |
| 1 kilowatt-hour (kWh) | 3.6e+06 J |
| 1 BTU (IT) | 1055.05585 J |
| 1 foot-pound (ft·lb) | 1.355818 J |
FAQ
How do you convert joule (J) to foot-pound (ft·lb)?
Multiply the joule (J) value by 1.355818 to get foot-pound (ft·lb). Or use the converter above — type in any box and every unit updates at once.
How many kilojoule (kJ) are in 1 joule (J)?
1 joule (J) = 0.001 kilojoule (kJ).
Is this converter free to use?
Yes. All tools on CalcConvert Tools are free, work in your browser, and require no sign-up.