Energy Conversion Calculator

Convert units of energy by entering the amount of energy and selecting the units you have, and the units you want to convert to.

• (IT) = International Table
• (th) = Thermochemical

How to Convert Units of Energy

Conversions are performed by using a conversion factor. By knowing the conversion factor, converting between units can become a simple multiplication problem:

S * C = E

Where S is our starting value, C is our conversion factor, and E is our end converted result.

To simply convert from any unit into joules, for example, from 100 kilowat-hours, just multiply by the conversion value in the right column in the table below.

100 kW · h * 3600000 [ (J) / ( kW · h) ] = 360000000 J

To convert from J into units in the left column divide by the value in the right column or, multiply by the reciprocal, 1/x.

360000000 J / 3600000 [ (J) / ( kW · h) ] = 100 kW · h

To convert among any units in the left column, say from A to B, you can multiply by the factor for A to convert A into Joules then divide by the factor for B to convert out of Joules. Or, you can find the single factor you need by dividing the A factor by the B factor.

For example, to convert from kilowat-hours to British Thermal Units you would multiply by 3600000 then divide by 1055.056. Or, multiply by 3600000/1055.056 = 3412.141156488. So, to convert directly from kW · h to BTU you multiply by 3412.141156488.

Conversion units for the Energy Converter

British Thermal Units (Btu), Calories (kcal), 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),

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.