well if it is in a box check the back Nuitrition facts
howmanycalories.com
If 100 g of your certain food gives 300 calories then: 30 g/ 100 g = 0.3 0.3 x 300 calories = 90 calories. So 30 g has 90 calories.
The caloriecounter.com allows you to keep track of your calories consumed and also offers a list of how many calories are in certain foods. calorieking.com has tons of entries of calories ranging from restaurants to simple things you eat at home and is very simple to use.
Search online, or ask in the restaurant.
The information on calories on food can be found on the package of each food. Moreover, one can also search on the internet for the calories of each food, such as the understanding calories of NHS. One can also download an application which explains how many calories each food has.
Did you find that on the back of a food packet? Usually it says 'kcal', but mean calories. :S So yeah, just 185 calories.
There is no such thing as "common foods". Foods are specific sometimes ot certain regions or areas, and there are so many foods out there. Please be more specific in your question, so WikiAnswers can provide you with the best possible answer.
Fats are not in calories but in food. Food nutrients (and fats are one of them) usually have calories.
Depends on the foods you are eating. You can easily do a search for the food, and you will find many sites give you the ingredients; one you will like is mydailyplate.com.
1000. Food Calories are SI kilocalories
There are no differences between "calories" and "Food Calories" when it comes to measurement; they refer to the same unit of energy. Therefore, 732.0 calories is equivalent to 732.0 Food Calories. In dietary terms, Food Calories are often denoted with a capital "C" (Cal) to distinguish them from small calories (cal), with 1 Food Calorie (Cal) equal to 1,000 small calories (cal). Thus, 732.0 calories equals 732.0 Food Calories.
You can find this infomration on the side of packages. However if the food does not have any info you can go to these websites, www.howmanycaloriesin.com and www.fitwatch.com/caloriecounter.html