 Online Calculators

# Energy Conversion Calculator

Convert Energy

a real number or scientific notation

## 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.

Units, symbols and conversion values
used in this energy calculator
To Convert from
Unit
Unit
Symbol
and Convert to
( J )
Multiply by
( J / Unit )
British thermal unit [IT]
BTUIT
joule
1055.056
British thermal unit [th]
BTUth
joule
1054.35
British thermal unit [mean]
BTUmean
joule
1055.87
British thermal unit [39°F]
BTU39°F
joule
1059.67
British thermal unit [59°F]
BTU59°F
joule
1054.8
British thermal unit [60°F]
BTU60°F
joule
1054.68
calorie [IT]
calIT
joule
4.1868
calorie [th]
calth
joule
4.184
calorie [mean]
calmean
joule
4.19002
calorie [15°C]
cal15°C
joule
4.1858
calorie [20°C]
cal20°C
joule
4.1819
electronvolt
eV
joule
1.60218E-19
erg
erg
joule
0.0000001
foot-poundal
ft·pdl
joule
0.04214011
foot-pound-force
ft·lbf
joule
1.355818
inch-pound-force
in·lbf
joule
0.112984829
joule
J
joule
1
megajoule
MJ
joule
1000000
kilocalorie [IT]
kcalIT
joule
4186.8
kilocalorie [th]
kcalth
joule
4184
kilocalorie [mean]
kcalmean
joule
4190.02
kilowatt-hour
kW·h
joule
3600000
joule
1.05506E+18
therm (EC)
therm
joule
105506000
therm (U.S.)
therm
joule
105480400
ton-of-coal-equivalent
TOC
joule
29307600000
ton-of-oil-equivalent
TOE
joule
41868000000
ton-of-TNT-equivalent
tTNT
joule
4184000000
watt-hour
W·h
joule
3600
watt-second
W·s
joule
1

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/

Cite this content, page or calculator as:

Furey, Edward "Energy Conversion Calculator"; CalculatorSoup, https://www.calculatorsoup.com - Online Calculators