How do you convert kilojoules to joules?

Answer by  idiotjones (705)

The prefix "kilo" means one-thousand. Therefore, you multiply the number of kilojoules by 1,000 to get the number of joules. US foods do NOT use joules or kilojoules but rather the (kilo)calorie. A food "calorie" is really a kilocalorie.

Answer by  mgoodman (204)

Kilojoules divided by 1000 equals joules. Joules divided by 4.184 equals a chemistry calorie, but US food measurements "calories" are truly in kilocalories, so then multiply by 1000. Nutrition calories are kilocalories, for some reason. So [(kilojoules/1000)/4.184]*1000 is actually kJ/4.184 = US food "calorie" measurment. The 1000's cancel out.

Answer by  Harold87 (33)

A kilojoule is one thousand joules. The conversion factor is to multiply by 1000. If you have five kilojoules, simply multiply by 1000 to arrive at the number of joules, which is 5000.

Answer by  Roger70 (107)

A kilojoule is 1000 joules. The U.S. standards for food labels specify calories, which are actually kilocalories. Most countries outside the US label food in kilojoules.