Units to Go · Energy conversion

Energy Converter: Kilowatt-Hours, Joules & More

Convert energy across joules, kilowatt-hours, calories, BTUs, and more. The calculator distinguishes thermochemical calories from food Calories.

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Conversions use standard unit definitions. Results use the selected number of decimal places; some exact conversions produce repeating decimals.

Kilowatt-hours to joules

One kilowatt-hour equals 3,600,000 joules.

Kilowatt-hours (kWh)	Joules (J)
0.5	1,800,000
1	3,600,000
5	18,000,000
10	36,000,000

Calories to kilojoules

Energy value	Kilojoules (kJ)
1 cal	0.004184
100 cal	0.4184
1,000 cal	4.184
1 food Calorie (1 kcal)	4.184

A food Calorie (capital C) is one kilocalorie (kcal), equal to 1,000 small calories (cal).

Also convert watt-hours, BTUs (International Table), and electronvolts.

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