Free Energy Converter Tool

Convert between 9 supported units including Joule (J), Kilojoule (kJ), Megajoule (MJ) with adjustable precision and a documented conversion methodology.

What this converter covers

Convert energy values between joules, calories, watt-hours, electronvolts, and BTU.

Worked example

1 Kilowatt Hour (kWh) = 3.6 Megajoule (MJ)

Important unit notes

•This converter uses the thermochemical calorie and the International Table BTU (BTU IT).
•Energy and power are different quantities: energy measures an amount, while power measures a rate of energy transfer.

Conversion factors are maintained against documented standards and definitions. Some displayed decimals are rounded for readability.How accuracy is handled·Sources

Supported units

Joule (J)

Kilojoule (kJ)

Megajoule (MJ)

Calorie (th)

Kilocalorie (kcal)

Watt Hour (Wh)

Kilowatt Hour (kWh)

Electronvolt (eV)

BTU (IT)

About this converter

This tool converts through a consistent base-unit relationship defined for the energy converter. It is designed for quick everyday use while preserving more internal precision than is normally useful to display.

Read the conversion methodology →

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