Convert energy between joules, kilojoules, calories, kilocalories, watt-hours and kilowatt-hours.
Enable JavaScript to use the interactive calculator; the example and formula are described below.
Running and walking pace, speed relationships and common everyday unit-conversion formulas.
Enter the requested values above and select Calculate. The result updates immediately on the page, so you can change one value and compare different scenarios without leaving the calculator.
Convert kWh to joules or food kilocalories to kilojoules.
Convert energy between joules, kilojoules, calories, kilocalories, watt-hours and kilowatt-hours. It is designed for quick estimates and everyday problem solving. When a calculation affects a contract, tax filing, medical decision or other high-stakes situation, verify the result with the appropriate professional or authoritative source.
A kilowatt-hour equals 3,600 kilojoules; choose kWh as input and kJ as output.
Electrical energy, heat and mechanical energy share compatible energy units even though their practical uses differ.
A calorie used on food labels is a kilocalorie, not the small thermochemical calorie.
Related tools: Length Converter · Weight Converter
Convert energy between joules, kilojoules, calories, kilocalories, watt-hours and kilowatt-hours.
Values are converted through joules as a common base unit.
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See how formulas, sources and limitations are handled across ERICH Calculators.