Energy converter
Convert joules, Wh, kWh, calories, BTU and thermies.
This tool lets you convert energy between joules, calories, watt-hours, BTU and other common units.
Result
Approximation
Quick explanation
Enter a positive or zero amount of energy, then select the source and target units.
The result is recalculated immediately and the precise value can be copied.
Try this too
Convert power
For watts, kilowatts and horsepower, use the power converter.
Additional information
Electrical energy, heat and calories
The joule is the SI reference unit. Watt-hours and kilowatt-hours are common for electricity, while calories and BTU are mostly used in thermal or food contexts.
kWh and kW: do not confuse them
kWh measures an amount of energy. kW measures instantaneous power. Power maintained over time produces energy.
Why are negative values blocked?
This converter handles an amount of energy consumed, supplied or stored. It is therefore zero or positive.
Local calculation
Conversions are performed in your browser and are not sent to the server.
Limits and reuse
AppErgo tools are provided free of charge for practical and informational purposes. Although care is taken in their design, a result may be incomplete, unexpected or incorrect. Before relying on a result for any important use, check it using an appropriate method.
To report a bug in the tool, you can use the dedicated bug report form.
Results produced by AppErgo tools may be copied and reused freely. When publicly reusing a result, a method or an AppErgo page, a link to the relevant page is appreciated.
Unless otherwise stated, AppErgo texts, images, visual elements, scripts, templates and internal components remain the property of AppErgo.
For any other request, you can contact the webmaster.