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.
( J )
( J / Unit )
References/ Further Reading
The National Institute of Standards and Technology (NIST) - The NIST Guide for the use of the International System of Units - Appendix B, subsections B.8 Factors for Units Listed Alphabetically and B.9 Factors for units listed by kind of quantity or field of science.
Lide, David R., Daniel (Editor-in-Chief). CRC Handbook of Chemistry and Physics, 89th Edition New York, NY: CRC Press, p. 1-28, 2008.
Wikipedia contributors. "Conversion of units" Wikipedia, The Free Encyclopedia. Wikipedia, The Free Encyclopedia, last visited 26 Jun. 2011.
How Many? A dictionary of units of measurement at http://www.unc.edu/~rowlett/units/