Calorie conversions

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The calorie conversion selector on this page selects the energy measurement unit 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)

Notes:
(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.

Symbol:

cal

Plural:

calories

Calorie conversions: links

A detailed list with conversions from calories to other (metric, imperial, or customary) energy measurement units is shown below.