Hello, I'm glad to answer for you!
One kilojoule is equal to 239 calories. The conversion is as follows: 1 kcal (one large calorie) is equal to 1000 calories, and 1 card is equal to 4.182 joules. 1000 joules divided by 4.182 joules is about 239 calories.
So if we take the heat consumption as an example, 1987 kJ is equal to 474694.3 calories