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Kilojoules to thermochemical / food kilocalories: 1 kJ = 0.23900573614 kcal_th

Kilojoules to international kilocalories: 1 kJ = 0.23884589663 kcal_IT

Kilojoules to 15ºC kilocalories: 1 kJ = 0.23892008123 KCal₁₅

Kilojoules to 20ºC kilocalories: 1 kJ = 0.23912003826 KCal₂₀

The name calorie is used for two units of energy.

The small calorie or gram calorie (symbol: cal) is the approximate amount of energy needed to raise the temperature of one gram of water by one degree Celsius at sea level.

The large calorie, kilogram calorie, dietary calorie, nutritionist's calorie, nutritional calorie, Calorie (capital C) or food calorie (symbol: Cal) is approximately the amount of energy needed to raise the temperature of one kilogram of water by one degree Celsius. The large calorie is thus equal to 1000 small calories or one kilocalorie (symbol: kcal).

The joule, symbol J, is a derived unit of energy, work, or amount of heat in the International System of Units.[1] It is equal to the energy expended (or work done) in applying a force of one newton through a distance of one metre (1 newton metre or N·m), or in passing an electric current of one ampere through a resistance of one ohm for one second. It is named after the English physicist James Prescott Joule.