2000 kJ equals 477.8 calories. 1 kJ equals approximately 0.239 calories. One kilojoule equals approximately 0.239 calories, and one calorie equals 4.184 kilojoules, so 2,000 kilojoules equals 477.8 kilocalories. 1 kilocalorie (kilocalorie) is defined as the amount of heat that raises 1 milliliter of water by one degree centigrade. A 60 kg young man needs about 2100 calories a day for light work; a 60 kg young woman needs about 1800 calories a day for light work. The calorie content of 100g of cooked rice is about 116 calories, the calorie content of 100g of porridge is about 58 calories, the calorie content of 100g of egg is 140 calories, the calorie content of 100ml of whole milk is 55-64 calories, and the calorie content of 100g of instant noodle is about 473 calories. Usually, you can moderately understand the calories of common foods to help control the total calories of food, maintain a balanced diet, not picky, partiality, and try to eat less fried food.