Energy Converter

Energy: convert between joules, calories, and kilowatt-hours using the exact thermochemical calorie definition.

Value

Result

From unit

To unit

Works for any combination of the units above -- every value converts through the same verified base-unit math used on the individual pages.

How Energy Units Relate

Energy units here reduce to the joule, the SI unit of energy. The calorie traces back to the historical definition of heating water, standardized today as exactly 4.184 joules; the kilowatt-hour is a practical billing unit equal to running one kilowatt of power for one hour (3,600,000 joules).

All Energy Converters

Each of these has its own page with the exact formula, a reference table, and answers to common questions.

By Cedrick Reese, Ready Utilities