Energy converter
Energy units covered here: joules (J), kilojoules (kJ), millijoules (mJ), watt-hours (Wh), kilowatt-hours (kWh), btu (it) (BTU), calories (thermo) (cal). Energy = power × time, so it pairs with the power and time converters. Pick a pair below for its formula and worked factors, or open the full energy converter.
| Unit | 1 J equals | 1 unit equals |
|---|---|---|
| Kilojoules (kJ) | 0.001 kJ | 1000 J |
| Millijoules (mJ) | 1000 mJ | 0.001 J |
| Watt-hours (Wh) | 0.0002777778 Wh | 3600 J |
| Kilowatt-hours (kWh) | 0.0000002777778 kWh | 3600000 J |
| BTU (IT) (BTU) | 0.0009478171 BTU | 1055.056 J |
| Calories (thermo) (cal) | 0.2390057 cal | 4.184 J |
Energy Conversions
J to Wh
Convert Joules to Watt-hours
J to kJ
Convert Joules to Kilojoules
kJ to J
Convert Kilojoules to Joules
kWh to J
Convert Kilowatt-hours to Joules
J to BTU
Convert Joules to BTU (IT)
Wh to J
Convert Watt-hours to Joules
J to mJ
Convert Joules to Millijoules
J to kWh
Convert Joules to Kilowatt-hours
J to cal
Convert Joules to Calories (thermo)
kJ to mJ
Convert Kilojoules to Millijoules
kJ to Wh
Convert Kilojoules to Watt-hours
kJ to kWh
Convert Kilojoules to Kilowatt-hours
kJ to BTU
Convert Kilojoules to BTU (IT)
kJ to cal
Convert Kilojoules to Calories (thermo)
mJ to J
Convert Millijoules to Joules
mJ to kJ
Convert Millijoules to Kilojoules
mJ to Wh
Convert Millijoules to Watt-hours
mJ to kWh
Convert Millijoules to Kilowatt-hours
mJ to BTU
Convert Millijoules to BTU (IT)
mJ to cal
Convert Millijoules to Calories (thermo)
Wh to kJ
Convert Watt-hours to Kilojoules
Wh to mJ
Convert Watt-hours to Millijoules
Wh to kWh
Convert Watt-hours to Kilowatt-hours
Wh to BTU
Convert Watt-hours to BTU (IT)
Wh to cal
Convert Watt-hours to Calories (thermo)
kWh to kJ
Convert Kilowatt-hours to Kilojoules
kWh to mJ
Convert Kilowatt-hours to Millijoules
kWh to Wh
Convert Kilowatt-hours to Watt-hours
kWh to BTU
Convert Kilowatt-hours to BTU (IT)
kWh to cal
Convert Kilowatt-hours to Calories (thermo)
BTU to J
Convert BTU (IT) to Joules
BTU to kJ
Convert BTU (IT) to Kilojoules
BTU to mJ
Convert BTU (IT) to Millijoules
BTU to Wh
Convert BTU (IT) to Watt-hours
BTU to kWh
Convert BTU (IT) to Kilowatt-hours
BTU to cal
Convert BTU (IT) to Calories (thermo)
cal to J
Convert Calories (thermo) to Joules
cal to kJ
Convert Calories (thermo) to Kilojoules
cal to mJ
Convert Calories (thermo) to Millijoules
cal to Wh
Convert Calories (thermo) to Watt-hours
cal to kWh
Convert Calories (thermo) to Kilowatt-hours
cal to BTU
Convert Calories (thermo) to BTU (IT)