Calories, kilojoules, calories, kilocalories, cards, joules are all calorie units, for example, people who want to lose weight want to know how many calories they consume by running 500 meters fast or swimming 1000 meters; how many calories will be produced by eating 3 taels of rice or 4 taels of noodles at this meal, this is the time to use these calorie units. A calorie is a basic unit of heat, and 1 calorie = 1 calorie. Joules are also the basic unit of heat, and the conversion factor between calories and joules is 4.186, which means that 1 calorie = 4.186 joules. Dacca is a colloquial expression, Dacca is actually kcal, 1 dacca = 1 kcal = 1000 calories. 1 card = 4.186 joules, then 1 dacca = 4186 joules = 4.186 kJ = 1000 calories, that is, 1 dacca = 4.186 kJ = 1000 calories.