Is Energy Converter completely free?

Yes, Energy Converter is 100% free with unlimited conversions. No registration, login, or credit card required.

What energy units can I convert?

Convert between Joules, Calories, Kilocalories, BTU (British Thermal Units), kWh (kilowatt-hours), Watt-hour, and Megajoules. All conversions use scientific accuracy.

How accurate are the conversions?

Our converter provides accuracy up to 10 decimal places using standard energy conversion formulas. Results are precise for scientific, professional, and educational use.

Does Energy Converter work on mobile devices?

Yes, the tool works on all devices including iPhone, iPad, Android phones, tablets, and desktop computers with no app download needed.

Can I convert multiple values at once?

Convert one value at a time in the main interface. For batch conversions, simply repeat the process for each value in seconds.

Is my data private when using Energy Converter?

Yes, completely private. All conversions happen in your browser. No data is stored, transmitted, or shared with servers.

What is a joule and when do I use it?

A joule is the SI unit of energy equal to the work done by one newton over one meter. Used in physics, engineering, and scientific calculations.

How do I convert kWh to joules?

Select 'kWh' as your source unit and 'Joules' as your target unit. One kWh equals 3,600,000 joules (3.6 megajoules).

fast

Energy Converter — fast

Convert between joules, calories, BTU, kWh and more.

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All energy conversions

Joules (J)NaN

Kilojoules (kJ)NaN

Calories (cal)NaN

Kilocalories (kcal)NaN

Watt-hours (Wh)NaN

Kilowatt-hours (kWh)NaN

BTUNaN

Electron-volts (eV)NaN

How to use Energy Converter

Enter your energy value

Type your numerical value in the 'Input Value' field on the left side of the converter. You can enter whole numbers or decimals (e.g., 1000 or 1500.5).

Select your source unit

Click the 'From Unit' dropdown menu and choose your current energy unit from the list: Joules, Calories, Kilocalories, BTU, kWh, Watt-hour, or Megajoules.

Choose your target unit

Click the 'To Unit' dropdown menu below the source unit selector and select the energy unit you want to convert to from the same list of options.

View instant conversion results

The converted value appears automatically in the 'Result' field on the right side. Copy the result by clicking the blue 'Copy' button next to the output value.

Frequently Asked Questions

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