Energy Unit Conversion Calculators

Convert one unit of energy to another. Start by selecting the energy unit to convert from.
Joules
Calories
Watts x Time
Thermal Units
Electronvolts

Units of Energy Measurement

Units of energy include joules, kilojoules, megajoules, gigajoules, calories, kilocalories, megacalories, watt-hours, kilowatt-hours, megawatt-hours, watt-seconds, british thermal units, million BTU, therms, quads, electronvolts, kiloelectronvolts, and megaelectronvolts.

Common Energy Measurement Conversions

Joules to british thermal units energy conversion
1 joule is equal to 0.000948 british thermal units
Joules to watt-hours energy conversion
1 joule is equal to 0.000278 watt-hours
Joules to electronvolts energy conversion
1 joule is equal to 6,241,500,000,000,000,000 electronvolts
Watt-hours to joules energy conversion
1 watt-hour is equal to 3,600 joules
Watt-hours to british thermal units energy conversion
1 watt-hour is equal to 3.412142 british thermal units
Watt-hours to electronvolts energy conversion
1 watt-hour is equal to 22,469,000,000,000,000,786,432 electronvolts
British Thermal Units to joules energy conversion
1 british thermal unit is equal to 1,055 joules
British Thermal Units to watt-hours energy conversion
1 british thermal unit is equal to 0.293071 watt-hours
British Thermal Units to electronvolts energy conversion
1 british thermal unit is equal to 6,585,100,000,000,000,131,072 electronvolts

Energy Unit Conversion Table

Equivalent energy metric and imperial measurements
Convert From Joule Kilojoule Megajoule Gigajoule Calorie Kilocalorie Megacalorie Watt-hour Kilowatt-hour Megawatt-hour Watt-second British Thermal Unit Million BTU Therm Quad Electronvolt Kiloelectronvolt Megaelectronvolt
1 joule = 1 J 0.001 kJ 0.000001 MJ 0.000000001 GJ 0.239006 cal 0.000239 kcal 0.00000023901 Mcal 0.000278 Wh 0.00000027778 kWh 0.00000000027778 MWh 1 Ws 0.000948 BTU 0.00000000094782 MMBTU 0.0000000094782 0.00000000000000000094782 6,241,500,000,000,000,000 eV 6,241,500,000,000,000 keV 6,241,509,343,260 MeV
1 kilojoule = 1,000 J 1 kJ 0.001 MJ 0.000001 GJ 239.005736 cal 0.239006 kcal 0.000239 Mcal 0.277778 Wh 0.000278 kWh 0.00000027778 MWh 1,000 Ws 0.947817 BTU 0.00000094782 MMBTU 0.0000094782 0.00000000000000094782 6,241,499,999,999,999,606,784 eV 6,241,500,000,000,000,000 keV 6,241,500,000,000,000 MeV
1 megajoule = 1,000,000 J 1,000 kJ 1 MJ 0.001 GJ 239,006 cal 239.005736 kcal 0.239006 Mcal 277.777778 Wh 0.277778 kWh 0.000278 MWh 1,000,000 Ws 947.81712 BTU 0.000948 MMBTU 0.009478 0.00000000000094782 6,241,499,999,999,999,833,276,416 eV 6,241,499,999,999,999,606,784 keV 6,241,500,000,000,000,000 MeV
1 gigajoule = 1,000,000,000 J 1,000,000 kJ 1,000 MJ 1 GJ 239,005,736 cal 239,006 kcal 239.005736 Mcal 277,778 Wh 277.777778 kWh 0.277778 MWh 1,000,000,000 Ws 947,817 BTU 0.947817 MMBTU 9.478171 0.00000000094782 6,241,500,000,000,000,443,161,772,032 eV 6,241,499,999,999,999,833,276,416 keV 6,241,499,999,999,999,606,784 MeV
1 calorie = 4.184 J 0.004184 kJ 0.000004184 MJ 0.000000004184 GJ 1 cal 0.001 kcal 0.000001 Mcal 0.001162 Wh 0.0000011622 kWh 0.0000000011622 MWh 4.184 Ws 0.003966 BTU 0.0000000039657 MMBTU 0.000000039657 0.0000000000000000039657 26,114,000,000,000,000,000 eV 26,114,000,000,000,000 keV 26,114,475,092,201 MeV
1 kilocalorie = 4,184 J 4.184 kJ 0.004184 MJ 0.000004184 GJ 1,000 cal 1 kcal 0.001 Mcal 1.162222 Wh 0.001162 kWh 0.0000011622 MWh 4,184 Ws 3.965667 BTU 0.0000039657 MMBTU 0.000039657 0.0000000000000039657 26,113,999,999,999,999,475,712 eV 26,114,000,000,000,000,000 keV 26,114,000,000,000,000 MeV
1 megacalorie = 4,184,000 J 4,184 kJ 4.184 MJ 0.004184 GJ 1,000,000 cal 1,000 kcal 1 Mcal 1,162 Wh 1.162222 kWh 0.001162 MWh 4,184,000 Ws 3,966 BTU 0.003966 MMBTU 0.039657 0.0000000000039657 26,113,999,999,999,997,898,653,696 eV 26,113,999,999,999,999,475,712 keV 26,114,000,000,000,000,000 MeV
1 watt-hour = 3,600 J 3.6 kJ 0.0036 MJ 0.0000036 GJ 860.42065 cal 0.860421 kcal 0.00086 Mcal 1 Wh 0.001 kWh 0.000001 MWh 3,600 Ws 3.412142 BTU 0.0000034121 MMBTU 0.000034121 0.0000000000000034121 22,469,000,000,000,000,786,432 eV 22,469,000,000,000,000,000 keV 22,469,000,000,000,000 MeV
1 kilowatt-hour = 3,600,000 J 3,600 kJ 3.6 MJ 0.0036 GJ 860,421 cal 860.42065 kcal 0.860421 Mcal 1,000 Wh 1 kWh 0.001 MWh 3,600,000 Ws 3,412 BTU 0.003412 MMBTU 0.034121 0.0000000000034121 22,469,000,000,000,001,323,302,912 eV 22,469,000,000,000,000,786,432 keV 22,469,000,000,000,000,000 MeV
1 megawatt-hour = 3,600,000,000 J 3,600,000 kJ 3,600 MJ 3.6 GJ 860,420,650 cal 860,421 kcal 860.42065 Mcal 1,000,000 Wh 1,000 kWh 1 MWh 3,600,000,000 Ws 3,412,142 BTU 3.412142 MMBTU 34.121416 0.0000000034121 22,468,999,999,999,999,364,797,825,024 eV 22,469,000,000,000,001,323,302,912 keV 22,469,000,000,000,000,786,432 MeV
1 watt-second = 1 J 0.001 kJ 0.000001 MJ 0.000000001 GJ 0.239006 cal 0.000239 kcal 0.00000023901 Mcal 0.000278 Wh 0.00000027778 kWh 0.00000000027778 MWh 1 Ws 0.000948 BTU 0.00000000094782 MMBTU 0.0000000094782 0.00000000000000000094782 6,241,500,000,000,000,000 eV 6,241,500,000,000,000 keV 6,241,509,343,260 MeV
1 british thermal unit = 1,055 J 1.055056 kJ 0.001055 MJ 0.0000010551 GJ 252.164401 cal 0.252164 kcal 0.000252 Mcal 0.293071 Wh 0.000293 kWh 0.00000029307 MWh 1,055 Ws 1 BTU 0.000001 MMBTU 0.00001 0.000000000000001 6,585,100,000,000,000,131,072 eV 6,585,100,000,000,000,000 keV 6,585,100,000,000,000 MeV
1 million BTU = 1,055,055,853 J 1,055,056 kJ 1,055 MJ 1.055056 GJ 252,164,401 cal 252,164 kcal 252.164401 Mcal 293,071 Wh 293.07107 kWh 0.293071 MWh 1,055,055,853 Ws 1,000,000 BTU 1 MMBTU 10 0.000000001 6,585,100,000,000,000,286,429,020,160 eV 6,585,100,000,000,000,458,227,712 keV 6,585,100,000,000,000,131,072 MeV
1 therm = 105,505,585 J 105,506 kJ 105.505585 MJ 0.105506 GJ 25,216,440 cal 25,216 kcal 25.21644 Mcal 29,307 Wh 29.307107 kWh 0.029307 MWh 105,505,585 Ws 100,000 BTU 0.1 MMBTU 1 0.0000000001 658,510,000,000,000,028,642,902,016 eV 658,509,999,999,999,992,135,680 keV 658,510,000,000,000,065,536 MeV
1 quad = 1,055,100,000,000,000,000 J 1,055,100,000,000,000 kJ 1,055,055,852,620 MJ 1,055,055,853 GJ 252,160,000,000,000,000 cal 252,160,000,000,000 kcal 252,164,400,722 Mcal 293,070,000,000,000 Wh 293,071,070,172 kWh 293,071,070 MWh 1,055,100,000,000,000,000 Ws 1,000,000,000,000,000 BTU 1,000,000,000 MMBTU 10,000,000,000 1 6,585,099,999,999,999,807,801,088,461,852,639,232 eV 6,585,099,999,999,999,770,907,600,314,433,536 keV 6,585,100,000,000,000,374,389,950,382,080 MeV
1 electronvolt = 0.00000000000000000016022 J 0.00000000000000000000016022 kJ 0.00000000000000000000000016022 MJ 0.00000000000000000000000000016022 GJ 0.000000000000000000038293 cal 0.000000000000000000000038293 kcal 0.000000000000000000000000038293 Mcal 0.000000000000000000000044505 Wh 0.000000000000000000000000044505 kWh 0.000000000000000000000000000044505 MWh 0.00000000000000000016022 Ws 0.00000000000000000000015186 BTU 0.00000000000000000000000000015186 MMBTU 0.0000000000000000000000000015186 0.00000000000000000000000000000000000015186 1 eV 0.001 keV 0.000001 MeV
1 kiloelectronvolt = 0.00000000000000016022 J 0.00000000000000000016022 kJ 0.00000000000000000000016022 MJ 0.00000000000000000000000016022 GJ 0.000000000000000038293 cal 0.000000000000000000038293 kcal 0.000000000000000000000038293 Mcal 0.000000000000000000044505 Wh 0.000000000000000000000044505 kWh 0.000000000000000000000000044505 MWh 0.00000000000000016022 Ws 0.00000000000000000015186 BTU 0.00000000000000000000000015186 MMBTU 0.0000000000000000000000015186 0.00000000000000000000000000000000015186 1,000 eV 1 keV 0.001 MeV
1 megaelectronvolt = 0.00000000000016022 J 0.00000000000000016022 kJ 0.00000000000000000016022 MJ 0.00000000000000000000016022 GJ 0.000000000000038293 cal 0.000000000000000038293 kcal 0.000000000000000000038293 Mcal 0.000000000000000044505 Wh 0.000000000000000000044505 kWh 0.000000000000000000000044505 MWh 0.00000000000016022 Ws 0.00000000000000015186 BTU 0.00000000000000000000015186 MMBTU 0.0000000000000000000015186 0.00000000000000000000000000000015186 1,000,000 eV 1,000 keV 1 MeV

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