A kilojoule is a unit of heat, while a kilocalorie refers to a kilocalorie, which is also a unit of measurement of heat. According to the International Standard for Conversion of Units, one kilojoule equals 0.2389 kilocalories. A kilojoule is an international unit of calories, generally referred to as one thousand joules, and is often used as a measure of the amount of calories contained in food as well as the amount of calories burned per unit of time for a certain type of exercise. A kilocalorie, also called a kilocalorie, is the amount of heat required to raise the temperature of 1kg of water by 1°C, which is equal to 1,000 calories. In general, 1 kJ is equal to 0.2389 kcal, or 238.9 calories. On the other hand, 1 kilocalorie is approximately equal to 4.185 kilojoules, or 4186 joules.