WikiUnits

Convert Calorie [cal] to...

cal
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

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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.