# Energy Conversion Calculator

## Calculator Use

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.

Unit

Symbol

( J )

( J / Unit )

_{IT}

_{th}

_{mean}

_{39°F}

_{59°F}

_{60°F}

_{IT}

_{th}

_{mean}

_{15°C}

_{20°C}

_{IT}

_{th}

_{mean}

## 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.ibiblio.org/units/ accessed 2023-07-25