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Factors in boldface are exact
Conversion Factors for ENERGY (includes WORK)
To convert from to Multiply by
British thermal unitIT(BtuIT) joule (J) 1.055 055 852 62 E+03
British thermal unitth(Btuth) joule (J) 1.054 350 E+03
British thermal unit (mean) (Btu) joule (J) 1.055 87 E+03
British thermal unit (39°F) (Btu) joule (J) 1.059 67 E+03
British thermal unit (59°F) (Btu) joule (J) 1.054 80 E+03
British thermal unit (60°F) (Btu) joule (J) 1.054 68 E+03
calorieIT(calIT) joule (J) 4.1868 E+00
calorieth(calth) joule (J) 4.184 E+00
calorie (mean) (cal) joule (J) 4.190 02 E+00
calorie (15°C) (cal15) joule (J) 4.185 80 E+00
calorie (20°C) (cal20) joule (J) 4.181 90 E+00
calorieIT, kilogram (nutrition) joule (J) 4.1868 E+03
calorieth, kilogram (nutrition) joule (J) 4.184 E+03
calorie (mean), kilogram (nutrition) joule (J) 4.190 02 E+03
electronvolt (eV) joule (J) 1.602 177 E-19
erg (erg) joule (J) 1.0 E-07
foot poundal joule (J) 4.214 011 E-02
foot pound-force (ft·lbf) joule (J) 1.355 818 E+00
kilocalorieIT (kcalIT) joule (J) 4.1868 E+03
kilocalorieth (kcalth) joule (J) 4.184 E+03
kilocalorie (mean) (kcal) joule (J) 4.190 02 E+03
kilowatt hour (kW·h) joule (J) 3.6 E+06
kilowatt hour (kW·h) megajoule (MJ) 3.6 E+00
quad (10E+15 BtuIT) joule (J) 1.055 056 E+18
therm (EC) joule (J) 1.055 06 E+08
therm (U.S.) joule (J) 1.054 804 E+08
ton of TNT (energy equivalent) joule (J) 4.184 E+09
watt hour (W·h) joule (J) 3.6 E+03
watt second (W·s) joule (J) 1.0 E+00
ENERGY DIVIDED BY AREA TIME
To convert from to Multiply by
erg per square centimeter second
[erg/(cm²·s)] watt per square meter (W/m²) 1.0 E-03
watt per square centimeter (W/cm²) watt per square meter (W/m²) 1.0 E+04
watt per square inch (W/in²) watt per square meter (W/m²) 1.550 003 E+03
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The exact conversion factor for the International Table Btu
is BtuIT 1.055 055 852 62 kJ.
IT International Table
th thermochemical