Energy Converter
Convert energy between joules, kilojoules, megajoules, watt-hours, kilowatt-hours and thermochemical calories.
Make this result useful
Use it now, or keep a copy for later. We never save your tool input automatically.
How to use this tool
Enter an energy amount and select the source and target units.
Important to know
Convert energy between joules, kilojoules, megajoules, watt-hours, kilowatt-hours and thermochemical calories.
Calories here are thermochemical calories; 1 kcal is 1,000 cal. This tool does not infer energy use from power without a duration.
Formula and methodology
1 Wh = 3,600 J; 1 kWh = 3,600,000 J; 1 thermochemical cal = 4.184 J; 1 kcal = 4,184 J.
Example
2 kWh equals 7.2 MJ.
Frequently asked questions
Can I convert kilowatts to kilowatt-hours directly?
No. Multiply power in kW by elapsed hours to obtain energy in kWh.