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cal, energy
Calorie is French and derives from the Latin calor (heat). In most fields, it has been replaced by the joule, the SI unit of energy. However, it remains in common use for the amount of food energy. Many different definitions for the calorie emerged during the 19th and 20th centuries.
1 cal
is equal to
3.09 foot-pound
British/American
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3.97×10-18
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3.97×10-8
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3.97×10-3
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3.09
Other
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10-3
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1
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10-6