1000 kcal is equivalent to 1000 calories.
1. kcal is a unit of energy and is often used in nutrition to represent the calories/energy of food. The letter kcal is kcal, k stands for thousand, and cal is shorthand for calorie, which stands for calorie. 1 calorie, equal to 1 kcal, is equal to 1,000 calories.
2.1 cal is equal to 4.186 joules (j), which is the amount of heat required to raise 1 gram of water 1°C at 1 atmosphere. Joules are often used to express the energy of a food on its nutritional content table, and conversions usually need to be done to get the more commonly used unit: kilocalorie.
Calorie is an important aspect in evaluating food, and knowing the calorie content of common foods helps us to better understand nutrition.