1 kcal = 1 kcal.

Cal is the abbreviation of calories (abbreviated as cal), which is transliterated from the English Calorie. It is defined as the heat required to raise 1 gram of water by 1°C at 1 atmosphere of pressure. Calories are units of energy that are widely used in nutritional measurement and fitness manuals. The international standard unit of energy is joule, 1 calorie = 4.1868 joules.

1 kcal = 1000 calories, mostly used in nutritional measurement and fitness manuals. For example: if the temperature of 1kg pure water increases or decreases by 1 degree Celsius, the heat absorbed or released is 1 kcal. Kcal is kilocalories (formally speaking it should be kilocalories or kcal).

Used to evaluate the quality of fuel, one kilogram of fuel can raise X kilograms of water by 1 degree Celsius, which means the calorific value of this fuel is X kcal. The commonly used unit of heat in China is 20°C, which is the amount of heat required for 1 gram of pure water to rise from 19.5°C to 20.5°C.