Ask an expert

03 Mar 2003

Hi, i was just wondering exactly how many calories are in a kilo?
Answer 435 views

01 Jan 0001

The different forms such as kilojoules, calories etc. come about because of the different units of expression energy - it's much the same as kilometres and miles, or metres and yards.

All three are units of energy. One kilocalorie (kCal) is equal to 4.184 kilojoules (kJ). The Calorie (spelled with a capital C) is exactly the same as the kCal. A calorie (with a small letter C) is equal to one thousandth of a kilocalorie (Don't ask me to explain this one!).

SO, in other words

1 kCal = 4.184 kJ
1 kCal = 1 Calorie
1 kCal - 1000 calories

Then, in terms of the actual calorie content of different foods, one gram of fat contains 37 kJ, one gram of carbohydrates contains 17 kj and one gram of protein usually contains about 17 kJ.

Hope this helps

The information provided does not constitute a diagnosis of your condition. You should consult a medical practitioner or other appropriate health care professional for a physical examination, diagnosis and formal advice. Health24 and the expert accept no responsibility or liability for any damage or personal harm you may suffer resulting from making use of this content.