Convert joules, calories, BTU, kilowatt-hours, electron volts, and foot-pounds.
Energy Unit Converter expresses one energy amount in joules, calories, British thermal units, kilowatt-hours, electron volts, or foot-pounds. Choose the unit attached to the known value and the unit needed for the result; the quantity stays the same while its numerical representation changes. A common mistake is treating a dietary Calorie as one small calorie. A food Calorie is a kilocalorie, equal to 1,000 small calories, so the distinction can change a conversion by a factor of 1,000.
A concrete input and expected output from the current implementation.
Input
1 kilowatt-hour to joules
Expected output
3,600,000 joules
One kilowatt is 1,000 joules per second, and one hour is 3,600 seconds. Multiplying 1,000 by 3,600 gives exactly 3,600,000 joules.
The entered value is interpreted in its selected source unit and expressed in the selected destination unit using their energy conversion factors. For example, kilowatt-hours combine power and elapsed time, while electron volts describe energy on a much smaller scale. Converting units does not add time, power, temperature, mass, or any other missing physical quantity.
Calories and BTUs have more than one published definition, so their exact conversion factors depend on the convention represented by the unit label. If a source document identifies a thermochemical calorie, International Table calorie, or a particular BTU definition, confirm that it matches the converter's unit before relying on fine precision. Joules and kilowatt-hours do not have this ambiguity.
No. A watt measures power, which is energy transferred per unit time, while a joule measures energy. You need a duration as well as the power: joules equal watts multiplied by seconds. This converter can handle kilowatt-hours because that unit already includes both a power scale and a time interval.
No. An electron volt is a unit of energy; a volt is a unit of electric potential difference. One electron volt is the energy associated with one elementary charge moving through a potential difference of one volt. The converter treats eV as energy and therefore can express it in joules or the other supported energy units.
The example and behavioral notes were checked against the browser implementation. Standards and primary references below define the relevant format, formula, or platform behavior.
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