# Convert Calorie [cal] to...

cal | |
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Unit system | metric |

Unit of | energy |

Symbol | cal |

Unit conversions | |

1 cal in ... |
... is equal to ... |

SI units | 4.187 J |

Imperial/US unit(s) | 3.088 ft.lbf |

**I want to convert:**
**using**

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eV |

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The large **calorie** or **kilogram calorie** (symbol: Cal), also known as the food calorie and similar names, is defined in terms of the kilogram rather than the gram. It is equal to 1000 small calories i.e. 1 **kilocalorie** (symbol: kcal).

Although these units relate to the metric system all forms of the **calorie** were deemed obsolete in science after the SI system was adopted in the 1950s. The unit of energy in the International System of Units is the joule. One small **calorie** is approximately 4.2 joules (so one large **calorie** is about 4.2 kilojoules).

The factor used to convert **calorie** to joules at a given temperature is numerically equivalent to the specific heat capacity of water expressed in joules per kelvin per gram or per kilogram. The precise conversion factor depends on the definition adopted.

This article uses material from the Wikipedia article "Calorie", which is released under the Creative Commons Attribution-Share-Alike License 3.0.