Calorie conversions

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Energy Conversions: calorie conversions - convert calories to:
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The online converter calculator on this page allows you to select the energy measurement unit you want to convert to starting from calories (cal). To make a conversion starting from a unit of energy other than calorie, simply click on the "Reset" button.

What is calorie?


The calorie (thermochemical) is a unit of energy equal to 4.184 joules (1 cal = 4.184 J), the SI derived unit of energy. It is also equal to 0.004184 kilojoules (kJ), or 0.001 kilocalories (thermochemical) (kcal), or 10-9 gigacalories (thermochemical) (Gcal), or 0.003965667 British thermal units (IT) (BTU), or 0.002203148 Celsius heat units (IT) (CHU), or 0.00116222222 watt hours (Wh) or 1.16222222x10-6 kilowatt hours (kWh).

The calorie is the energy required to increase the temperature of one gram of water by one degree Celsius (or 1.8 degrees Fahrenheit) at a constant pressure of one atmosphere.

The calorie definition varies as follows:

  • The calorie (thermochemical) (cal) is equal to 4.184 joules (J)
  • The calorie (IT) (cal) is equal to 4.1868 joules (J)
  • The calorie (mean) (cal) is equal to about 4.19002 joules (J)
  • The calorie (4 °C) (cal) is equal to about 4.2045 joules (J)
  • The calorie (15 °C) (cal) is equal to 4.1855 joules (J)
  • The calorie (20 °C) (cal) is equal to about 4.1819 joules (J)

(i) The SI is an abbreviation for the International System of Units
(ii) The IT is an abbreviation for the International [Steam] Table
(iii) The food calorie - used in nutritional contexts only - is equal to 4.184 kilojoules or 1,000 thermochemical calories. The food calorie is also referred to as kilocalorie on the nutrition labels.





Below you can find a comprehensive list with conversions from calories to other (metric, imperial, or customary) energy measurement units.

  • calorie to barrel of oil equivalent (cal to BOE)
  • calorie to British thermal unit (59 F)
  • calorie to British thermal unit (IT) (cal to BTU)
  • calorie to calorie (15 C) (cal to cal)
  • calorie to calorie (IT) (cal to cal)
  • calorie to Celsius heat unit (IT) (cal to CHU)
  • calorie to cubic foot of natural gas
  • calorie to electron volt (cal to eV)
  • calorie to erg (cal to erg)
  • calorie to foot-pound force (cal to ft lbf)
  • calorie to foot-poundal (cal to ft pdl)
  • calorie to gallon-atmosphere (UK) (cal to gal atm)
  • calorie to gallon-atmosphere (US) (cal to gal atm)
  • calorie to giga-electron volt (cal to GeV)
  • calorie to gigacalorie (cal to Gcal)
  • calorie to gigajoule (cal to GJ)
  • calorie to gigawatt hour (cal to GWh)
  • calorie to Hartree (cal to Ha)
  • calorie to horsepower-hour (cal to hph)
  • calorie to inch-pound force (cal to in lbf)
  • calorie to joule (cal to J)
  • calorie to kilo-electron volt (cal to keV)
  • calorie to kilocalorie (cal to kcal)
  • calorie to kilojoule (cal to kJ)
  • calorie to kilowatt hour (cal to kWh)
  • calorie to liter-atmosphere (cal to L atm)
  • calorie to mega-electron volt (cal to MeV)
  • calorie to megacalorie (cal to Mcal)
  • calorie to megajoule (cal to MJ)
  • calorie to megawatt hour (cal to MWh)
  • calorie to microjoule (cal to μJ)
  • calorie to milli-electron volt (cal to meV)
  • calorie to millijoule (cal to mJ)
  • calorie to nanojoule (cal to nJ)
  • calorie to Newton metre (cal to Nm)
  • calorie to standard cubic centimeter (cal to scc)
  • calorie to standard cubic foot (cal to scf)
  • calorie to standard cubic yard (cal to scy)
  • calorie to tera-electron volt (cal to TeV)
  • calorie to terajoule (cal to TJ)
  • calorie to terawatt hour (cal to TWh)
  • calorie to ton of coal equivalent (cal to TCE)
  • calorie to ton of oil equivalent (cal to TOE)
  • calorie to watt hour (cal to Wh)
  • calorie to watt second (cal to Ws)