Energy Converter
Convert between energy / work / heat units
0.001
kJ
rate：1 J = 0.001 kJ
Results in all units
1 J| Unit | Symbol | Value |
|---|---|---|
| Metric | ||
| Joules | J | 1 |
| Kilojoules | kJ | 0.001 |
| Megajoules | MJ | 0.000001 |
| Millijoules | mJ | 1,000 |
| Calories | cal | 0.239006 |
| Kilocalories | kcal | 0.000239 |
| Calories (nutritional) | Cal | 0.000239 |
| Watt hours | Wh | 0.000278 |
| Kilowatt hours | kWh | 2.777778e-7 |
| Megawatt hours | MWh | 2.777778e-10 |
| Ergs | erg | 10,000,000 |
| Electron volts | eV | 6.241509e+18 |
| Imperial / Other | ||
| British thermal units | BTU | 0.000948 |
| Foot pounds | ft·lb | 0.737562 |
| Horsepower hours | hp·h | 3.725061e-7 |
| Therms | thm | 9.478171e-9 |
| Tons of TNT | tTNT | 2.390057e-10 |
Popular Energy Conversions
Recent Conversions
Clear
1 Joules
→
0.001 Kilojoules
⚡ Energy
1 Milliwebers
→
0.001 Webers
🧲 Magnetic Flux
1 Webers
→
1,000 Milliwebers
🧲 Magnetic Flux
1 Decibels
→
0.000022 Sound Pressure (Pa)
🔊 Sound Level
1 Sound Pressure (Pa)
→
93.9794 Decibels
🔊 Sound Level
1 Kilograms per minute
→
0.016667 Kilograms per second
⚖️ Mass Flow Rate
1 Kilograms per second
→
60 Kilograms per minute
⚖️ Mass Flow Rate
Trending Conversions
Just Converted
2 Tons of TNT
→
8,368 Megajoules
⚡ Energy
7 Joules
→
1.673e-9 Tons of TNT
⚡ Energy
52 Foot pounds
→
2.626263e-5 Horsepower hours
⚡ Energy
88 Kilowatt hours
→
316.8 Megajoules
⚡ Energy
28 Megajoules
→
6,692,160.6119 Calories
⚡ Energy
55 Millijoules
→
1.527778e-5 Watt hours
⚡ Energy
26 Millijoules
→
7.222222e-6 Watt hours
⚡ Energy
81 Watt hours
→
0.081 Kilowatt hours
⚡ Energy
461 Kilojoules
→
110.1816 Kilocalories
⚡ Energy
30 Kilocalories
→
3e-5 Tons of TNT
⚡ Energy
Common Scenarios
Energy conversion is widely used in energy trading, nutrition, and engineering thermodynamics. In nutrition, we often look at food labels converting between kilocalories (kcal) and kilojoules (kJ). On electricity bills, kilowatt-hours (kWh) are the billing unit.
History & Background
The concept of energy took a long time to form. Later, James Joule proved through his "mechanical equivalent of heat" experiment that heat and work are interconvertible, leading to the energy unit "joule" named after him.
Conversion Details
Energy conversion is based on the joule (J), covering work, heat and electrical energy.
Common conversions: 1 kcal = 4.184 kJ, 1 kWh = 3.6 MJ, 1 BTU ≈ 1,055 J.