It’s the same. There is no difference between kcal and kilocalories. Kcal is another name for kilocalories. The two are equal.

Calorie is a unit of energy. We tend to associate calories with food, but they actually apply to anything that contains energy. For example, 4 liters of gasoline contain approximately 31 million calories of energy. Using the calories in 217 Big Macs, you can drive 35 kilometers. Simply put, 1 calorie of energy or heat raises the temperature of 1 gram of water by 1 degree Celsius at one atmosphere of pressure. 1 calorie is approximately equal to 4.186 joules (joules are a commonly used unit of energy in physics).