Unit converters

Energy Converter

Convert joules, calories, watt-hours, and BTU. Nothing you enter leaves your browser.

Enter your values and we’ll calculate the result.

EnergyUnit

Your result

Enter your values, then calculate.

Simple by design

Get the answer, without the clutter.

FormatCalc is built for quick work. This energy converter runs entirely on your device, so private text and data stay private.

Enter or paste your information.

Set the values that matter to you.

Copy, use, or download your result.

Common questions

Is the Energy Converter free to use?

Yes. FormatCalc's Energy Converter is free to use with no account required.

Is my data private when I use the Energy Converter?

Yes. This tool processes your input locally in your browser. FormatCalc does not upload or store what you enter.

How do I use the Energy Converter?

Enter your values, select any units, and choose Calculate. You can then copy the result.