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Energy Converter

Spelling: American | British
Use this energy converter to convert instantly between calories, joules, kilocalories, kilowatt-hours and other metric and imperial energy units.


Disclaimer: Whilst every effort has been made in building this calculator, we are not to be held liable for any damages or monetary losses arising out of or in connection with the use of it. This tool is here purely as a service to you, please use it at your own risk. Full disclaimer. Do not use calculations for anything where loss of life, money, property, etc could result from inaccurate calculations.

Conversion units for the Energy Converter

British Thermal Units (Btu), Calories (nutrition) (cal (nut)), Calories (th) (cal (th)), Electron Volt (eV), Ergs, Foot Pounds (ft*lbf), Gigajoules (GJ), Joules (J), Kilocalories (th) (kcal), Kilojoules (kJ), Kilowatt-Hour (kW*h), Megajoules (MJ), Millijoules (mJ),

A Newton-meters to foot-pounds converter is also available.

Discover how much money you can save on your energy bill by switching your regular light bulbs to LED light bulbs. Use the LED Savings Calculator.


To help with productivity, we now set a cookie to store the last units you have converted from and to. This means that when you re-visit this energy converter, the units will automatically be selected for you.