The energy (kilojoule) content of potatoes depends in how they are prepared and with what they are served. Potatoes that have been boiled in their 'jackets' using a small volume of water retain more nutrients than those that have been cut into smaller pieces or covered with water and cooked. Boiled potatoes contain about 80 per cent water and are relatively low in energy 345 kilojoules per 100 gram). In comparison, baked potatoes, because they contain less water, have slightly more energy (365 kilojoules per 100 gram). Of course, if you add high energy dense butter, cheese or cream to your boiled or baked potatoes it will increase the kilojoules. Chips, because they contain absorbed fat and have less water, are much higher in energy (1065 kilooules per 100 gram). Smaller chips will absorb more fat and therefore be higher in kilojoules than the same weight of larger chips. Potato crisps contain even more fat than the same weight of chips, and are consequently higher in energy (2225 kilojoules per 100 grams).