Energy Converter

Convert joules, kilojoules, watt-hours, kWh, calories and BTU. Free to use online with no sign-up. Fast and mobile-friendly.

Useful for electricity, nutrition, heating and science calculations.

Formula

All units are converted through joules.

Example

1 kWh = 3.6 million joules.

Frequently asked questions

Is the energy converter free to use?: Yes. The tool is free to use and does not require an account.
Is my input stored?: For browser-based tools, your input stays on your device. The URL shortener is the exception because short links must be stored to redirect later.