How many joules are 4500 kcal?

To convert kilocalories (kcal) to joules, you can use the conversion factor where 1 kcal is approximately equal to 4,184 joules. Therefore, to convert 4,500 kcal to joules, you multiply 4,500 by 4,184, which equals about 18,900,000 joules, or 18.9 megajoules.