I installed a Calorie Counter on my sidebar just in case someone (or I) need to know the amount of calories in a particular food or foods. I don't really list my daily calorie intake, but it is really recommended for dieters. I tried to do so but forgot after several days.
Still a Calorie Counter is helpful from time to time. Also make a habit of checking food labels on supermarkets and decide to buy the one with the lowest calories. In the long run a cut of a few calories here and there would pile up and make a big difference in the future.
But be careful in reading labels, the tricky part is the per serving size and the actual size of the product. Usually they will list down the calories per 100 grams, but if you ate a bag of chips of 500 grams that means you need to multiply the calories by 5!