What energy units can I convert between?

The Energy converter supports 10 units, including Joule, Kilojoule, Calorie, Kilocalorie, and more.

Is the Energy converter free and accurate?

Yes — it's free with no limits, and uses standard conversion factors for energy.

Does the converter store the values I enter?

No. Conversions run entirely in your browser — nothing you type is sent to a server or stored.

Energy Converter

Select the units you want to convert between and enter a value.

Energy

From

Worth Knowing

Energy wears many units because it appears in many fields: joules in physics, calories in nutrition, kilowatt-hours on your electricity bill, and BTUs in heating and cooling. A subtlety worth knowing is that the food 'Calorie' with a capital C is actually a kilocalorie — a thousand of the physics calories — so a 2,000-Calorie diet is 2,000 kcal. The kilowatt-hour, meanwhile, is energy, not power: it's what you get by running one kilowatt for one hour.

How to Use

Choose the unit you're converting from and the unit you want, from the two dropdowns above.
Type a value into the input field — the converted result updates instantly.
Swap the two units any time to flip the direction of the conversion.