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^{*}International Steam Table Calorie (1956) (cal_{IT}) equals exactly 4.1868J
^{**}Most widely used BTU definition based on International Steam Table Calorie (1956)
Joule  Energy Unit
Unit of energy in the International System Of Units (SI) is Joule.
Joule is the derived unit. Joule formula:
1 J = 1 N · m = 1 kg · m ^{2} / s ^{2}
One joule is the amount of energy required to perform the following actions (source:wikipedia.org)
 The work done by a force of one newton traveling through a distance of one meter;
 The work required to move an electric charge of one coulomb through an electrical potential difference of one volt; or one coulomb volt, with the symbol C·V;
 The work done to produce power of one watt continuously for one second; or one watt second (compare kilowatt hour), with the symbol W·s. Thus a kilowatt hour is 3,600,000 joules or 3.6 megajoules;
 The kinetic energy of a 2 kg mass moving at a velocity of 1 m/s.
Joule to calorie formula: Based on International Steam Table (1956)
1 calorie is defined to be exactly 4.1868J. Ergo:
1 cal = 4.1868J => N calories = N*4.1868 J
1 J = 0.238846 cal => N joules = N*0.238846 calories.
Unit  In Joules 

Metric System


Joule [J]  1
 Kilojoule [kJ]  1000
 Kilogram meter [KGm]  9.80665
 Watt hour [Wh]  3600
 Kilowatt hour [kWh]  3600000
 Erg [erg]  1e7
 Imperial System


footpoundal [ft pdl]  0.0421401100938
 inchpound force [in lbf]  0.1129848290276167
 footpound force [ft lbf]  1.3558179483314004
 horsepowerhour [hph]  2.6845e+6
 BTU  1055.05585262
 Calories


Calories [cal]  4.1868
 Kilocalories [kcal]  4186.8
 Atomic


Electronvolt [eV]  1.6021765314e19
 Hartree [E_{h}]  4.3597441775e18
 Rydberg [Ry]  2.179872e18


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