Energy Converter
Convert between joules, calories, watt-hours, kWh, BTU and electronvolts.
About this calculator
Energy is expressed in wildly different units depending on the field, physics problems in joules, nutrition labels in Calories, electricity bills in kWh, HVAC and appliance ratings in BTU, and converting between them by hand means chaining together several unfamiliar multipliers, like the 4,184 joules in a kilocalorie or the 3,412 BTU in a kWh. This calculator converts an energy value between joules, calories, kilocalories, watt-hours, kilowatt-hours, BTU and electronvolts by routing through a common base unit of joules, giving an exact result for any pair without needing to remember or look up each conversion factor. It's useful for comparing a food's Calorie content to its energy in joules, checking how an appliance's kWh usage relates to a BTU-rated heater, or working through physics and engineering problems that mix unit systems.
Worked example
1 kWh to BTU
Result: 3,412.14 BTU
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