Energy Converter
Convert any amount of energy between SI, electrical, thermal and atomic units.
From
To
1 kWh =
| Joule | 3,600,000 J |
| Kilojoule | 3,600 kJ |
| Calorie | 860,420.650096 cal |
| Kilocalorie | 860.42065 kcal |
| Watt-hour | 1,000 Wh |
| British thermal unit | 3,412.12822 BTU |
| Foot-pound | 2,655,219.719432 ft-lb |
| Electronvolt | 22,469,432,668,058,746,000,000,000 eV |
About this calculator
Energy is the capacity to do work, measured in joules in the SI system. Different fields favor different units: nutrition uses kilocalories (often labeled "Calories"), electricity uses watt-hours and kilowatt-hours, heating uses BTU, and atomic physics uses electronvolts.
This converter uses the joule as its base unit. One kilowatt-hour equals 3,600,000 joules, one (thermochemical) calorie equals 4.184 joules, and one BTU equals about 1,055.06 joules. The electronvolt is extremely small at 1.602176634 x 10^-19 joules.
Frequently asked questions
One kilowatt-hour equals 3,600,000 joules (3.6 megajoules).
One joule equals about 0.239 calories; one calorie equals 4.184 joules.
A food "Calorie" (capital C) is actually a kilocalorie — 1000 small calories, or 4184 joules.
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