Energy (includes Work) Conversion Calculator
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 |
| quad (IT) |
quad |
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 |
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/
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