A calorie is actually a measure of energy, and is equivalent to how many Joules?

A calorie is defined as the amount of energy required to heat 1 gram of water 1 degree Celsius, and is equal to 4.18 Joules. Thus, when you eat food, you can calculate how much energy you are taking in! However, food ‘calories’ are actually kilocalories, meaning if you eat a chocolate bar with 140 calories in it, it is actually 140,000 calories.