Energy Units
Find the right formula and tools for all energy units. We use official rules to make sure every calculation is correct.
All Energy Unit Pairs
Pick a starting unit to see all possible conversion tools for energy.
Joules (J)
- joules to kilojoules
- joules to megajoules
- joules to gigajoules
- joules to watt-hours
- joules to kilowatt-hours
- joules to megawatt-hours
- joules to calories
- joules to kilocalories
- joules to btu
- joules to therms
- joules to electron-volts
- joules to ergs
- joules to newton-meters
- joules to foot-pounds
- joules to kiloton tnt yield
Kilojoules (kJ)
- kilojoules to joules
- kilojoules to megajoules
- kilojoules to gigajoules
- kilojoules to watt-hours
- kilojoules to kilowatt-hours
- kilojoules to megawatt-hours
- kilojoules to calories
- kilojoules to kilocalories
- kilojoules to btu
- kilojoules to therms
- kilojoules to electron-volts
- kilojoules to ergs
- kilojoules to newton-meters
- kilojoules to foot-pounds
- kilojoules to kiloton tnt yield
Megajoules (MJ)
- megajoules to joules
- megajoules to kilojoules
- megajoules to gigajoules
- megajoules to watt-hours
- megajoules to kilowatt-hours
- megajoules to megawatt-hours
- megajoules to calories
- megajoules to kilocalories
- megajoules to btu
- megajoules to therms
- megajoules to electron-volts
- megajoules to ergs
- megajoules to newton-meters
- megajoules to foot-pounds
- megajoules to kiloton tnt yield
Gigajoules (GJ)
- gigajoules to joules
- gigajoules to kilojoules
- gigajoules to megajoules
- gigajoules to watt-hours
- gigajoules to kilowatt-hours
- gigajoules to megawatt-hours
- gigajoules to calories
- gigajoules to kilocalories
- gigajoules to btu
- gigajoules to therms
- gigajoules to electron-volts
- gigajoules to ergs
- gigajoules to newton-meters
- gigajoules to foot-pounds
- gigajoules to kiloton tnt yield
Watt-hours (Wh)
- watt-hours to joules
- watt-hours to kilojoules
- watt-hours to megajoules
- watt-hours to gigajoules
- watt-hours to kilowatt-hours
- watt-hours to megawatt-hours
- watt-hours to calories
- watt-hours to kilocalories
- watt-hours to btu
- watt-hours to therms
- watt-hours to electron-volts
- watt-hours to ergs
- watt-hours to newton-meters
- watt-hours to foot-pounds
- watt-hours to kiloton tnt yield
Kilowatt-hours (kWh)
- kilowatt-hours to joules
- kilowatt-hours to kilojoules
- kilowatt-hours to megajoules
- kilowatt-hours to gigajoules
- kilowatt-hours to watt-hours
- kilowatt-hours to megawatt-hours
- kilowatt-hours to calories
- kilowatt-hours to kilocalories
- kilowatt-hours to btu
- kilowatt-hours to therms
- kilowatt-hours to electron-volts
- kilowatt-hours to ergs
- kilowatt-hours to newton-meters
- kilowatt-hours to foot-pounds
- kilowatt-hours to kiloton tnt yield
Megawatt-hours (MWh)
- megawatt-hours to joules
- megawatt-hours to kilojoules
- megawatt-hours to megajoules
- megawatt-hours to gigajoules
- megawatt-hours to watt-hours
- megawatt-hours to kilowatt-hours
- megawatt-hours to calories
- megawatt-hours to kilocalories
- megawatt-hours to btu
- megawatt-hours to therms
- megawatt-hours to electron-volts
- megawatt-hours to ergs
- megawatt-hours to newton-meters
- megawatt-hours to foot-pounds
- megawatt-hours to kiloton tnt yield
Calories (IT) (cal)
- calories to joules
- calories to kilojoules
- calories to megajoules
- calories to gigajoules
- calories to watt-hours
- calories to kilowatt-hours
- calories to megawatt-hours
- calories to kilocalories
- calories to btu
- calories to therms
- calories to electron-volts
- calories to ergs
- calories to newton-meters
- calories to foot-pounds
- calories to kiloton tnt yield
Kilocalories (kcal)
- kilocalories to joules
- kilocalories to kilojoules
- kilocalories to megajoules
- kilocalories to gigajoules
- kilocalories to watt-hours
- kilocalories to kilowatt-hours
- kilocalories to megawatt-hours
- kilocalories to calories
- kilocalories to btu
- kilocalories to therms
- kilocalories to electron-volts
- kilocalories to ergs
- kilocalories to newton-meters
- kilocalories to foot-pounds
- kilocalories to kiloton tnt yield
BTU (IT)
Therms (US)
- therms to joules
- therms to kilojoules
- therms to megajoules
- therms to gigajoules
- therms to watt-hours
- therms to kilowatt-hours
- therms to megawatt-hours
- therms to calories
- therms to kilocalories
- therms to btu
- therms to electron-volts
- therms to ergs
- therms to newton-meters
- therms to foot-pounds
- therms to kiloton tnt yield
Electron-volts (eV)
- electron-volts to joules
- electron-volts to kilojoules
- electron-volts to megajoules
- electron-volts to gigajoules
- electron-volts to watt-hours
- electron-volts to kilowatt-hours
- electron-volts to megawatt-hours
- electron-volts to calories
- electron-volts to kilocalories
- electron-volts to btu
- electron-volts to therms
- electron-volts to ergs
- electron-volts to newton-meters
- electron-volts to foot-pounds
- electron-volts to kiloton tnt yield
Ergs
Newton-meters (Nm)
- newton-meters to joules
- newton-meters to kilojoules
- newton-meters to megajoules
- newton-meters to gigajoules
- newton-meters to watt-hours
- newton-meters to kilowatt-hours
- newton-meters to megawatt-hours
- newton-meters to calories
- newton-meters to kilocalories
- newton-meters to btu
- newton-meters to therms
- newton-meters to electron-volts
- newton-meters to ergs
- newton-meters to foot-pounds
- newton-meters to kiloton tnt yield
Foot-pounds (ft-lb)
- foot-pounds to joules
- foot-pounds to kilojoules
- foot-pounds to megajoules
- foot-pounds to gigajoules
- foot-pounds to watt-hours
- foot-pounds to kilowatt-hours
- foot-pounds to megawatt-hours
- foot-pounds to calories
- foot-pounds to kilocalories
- foot-pounds to btu
- foot-pounds to therms
- foot-pounds to electron-volts
- foot-pounds to ergs
- foot-pounds to newton-meters
- foot-pounds to kiloton tnt yield
Kiloton TNT Yield
- kiloton tnt yield to joules
- kiloton tnt yield to kilojoules
- kiloton tnt yield to megajoules
- kiloton tnt yield to gigajoules
- kiloton tnt yield to watt-hours
- kiloton tnt yield to kilowatt-hours
- kiloton tnt yield to megawatt-hours
- kiloton tnt yield to calories
- kiloton tnt yield to kilocalories
- kiloton tnt yield to btu
- kiloton tnt yield to therms
- kiloton tnt yield to electron-volts
- kiloton tnt yield to ergs
- kiloton tnt yield to newton-meters
- kiloton tnt yield to foot-pounds
Our Standard Unit: Joules (J)
We calculate all energy units based on the standard Joules (J). This helps us keep all our tools accurate and reliable.
Conversion Formulas
Below is the list of rules we use to calculate each energy unit. You can use these to understand the math behind our tools.
Kilojoules (kJ)
Formula: 1 Kilojoules = 1000 Joules
To do the math instantly, use our kilojoules to joules or joules to kilojoules tools.
Megajoules (MJ)
Formula: 1 Megajoules = 1000000 Joules
To do the math instantly, use our megajoules to joules or joules to megajoules tools.
Gigajoules (GJ)
Formula: 1 Gigajoules = 1000000000 Joules
To do the math instantly, use our gigajoules to joules or joules to gigajoules tools.
Watt-hours (Wh)
Formula: 1 Watt-hours = 3600 Joules
To do the math instantly, use our watt-hours to joules or joules to watt-hours tools.
Kilowatt-hours (kWh)
Formula: 1 Kilowatt-hours = 3600000 Joules
To do the math instantly, use our kilowatt-hours to joules or joules to kilowatt-hours tools.
Megawatt-hours (MWh)
Formula: 1 Megawatt-hours = 3600000000 Joules
To do the math instantly, use our megawatt-hours to joules or joules to megawatt-hours tools.
Calories (IT) (cal)
Formula: 1 Calories = 4.1868 Joules
To do the math instantly, use our calories to joules or joules to calories tools.
Kilocalories (kcal)
Formula: 1 Kilocalories = 4186.8 Joules
To do the math instantly, use our kilocalories to joules or joules to kilocalories tools.
BTU (IT)
Formula: 1 BTU = 1055.06 Joules
To do the math instantly, use our btu to joules or joules to btu tools.
Therms (US)
Formula: 1 Therms = 105480400 Joules
To do the math instantly, use our therms to joules or joules to therms tools.
Electron-volts (eV)
Formula: 1 Electron-volts = 1.60218e-19 Joules
To do the math instantly, use our electron-volts to joules or joules to electron-volts tools.
Ergs
Formula: 1 Ergs = 1e-7 Joules
To do the math instantly, use our ergs to joules or joules to ergs tools.
Newton-meters (Nm)
Formula: 1 Newton-meters = 1 Joules
To do the math instantly, use our newton-meters to joules or joules to newton-meters tools.
Foot-pounds (ft-lb)
Formula: 1 Foot-pounds = 1.35582 Joules
To do the math instantly, use our foot-pounds to joules or joules to foot-pounds tools.
Kiloton TNT Yield
Formula: 1 Kiloton TNT Yield = 4184000000000 Joules
To do the math instantly, use our kiloton tnt yield to joules or joules to kiloton tnt yield tools.
All Systems
Compare these units against other measurement systems on our homepage.
All Unit Conversion Systems
Access our high-fidelity calculators for other measurement systems and engineering metrics.
- Length Unit Converters
- Weight & Mass Unit Converters
- Volume Unit Converters
- Temperature Unit Converters
- Area Unit Converters
- Pressure Unit Converters
- Energy Unit Converters
- Power Unit Converters
- Force Unit Converters
- Time Unit Converters
- Speed Unit Converters
- Angle Unit Converters
- Data Storage Unit Converters
- Volume - Dry Unit Converters
- Numbers Unit Converters