What is the relationship between a calorie and a joule?

calorie and Calorie . . . "small calorie" and "large calorie" . . . the common

units of energy before the SI system of units was introduced.

"small" calorie . . . "gram" calorie

energy to warm 1 gram of water 1 degree C.

4.184 joules

"large" Calorie . . . "kilogram" Calorie, "kilocalorie", the food calorie

energy to warm 1 kilogram of water 1 degree C

1,000 small calories

4,184 joules