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.
90
90
Every gram of carbohydrate has 4 calories, so 20 grams of carbohydrates would be 80 calories. But you also have to take into account the amount of protein and fat grams in the food, as well. Protein has the same amount of calories as carbohydrates (4 calories per gram) and fat has 9 calories per gram.
The Dietary Guidelines for Americans, states that half of your calories should come from carbohydrates. For example, if you eat approximately 2,000 calories per day, you should take in about 250 grams of carbohydrates.
There are 28.349 grams to an ounce. Accordingly, multiplying the number of calories in a gram by 28.349 will give you the number of calories in an ounce.
A food source with five grams of protein, ten grams of fat, and twenty grams of carbohydrates contains 190 calories. To find this, you need to know how many calories are in a gram of protein, fat, and carbohydrates. There are four calories in one gram of protein and one gram of carbohydrates. There are nine calories in one gram of fat. Then multiply five (the number of grams of protein) by four (the number of calories in one gram of protein), ten (the number of grams of fat) by nine (the number of calories in one gram of fat), and twenty (the number of grams of carbohydrates) by four (the number of calories in one gram of carbohydrates). Add those numbers up and you will know how many calories are in the food.
Each gram of fat contains 9 calories, therefore 5 grams of fat contains 45 calories.
232
135 calories from fat.
The Complete Book of Food Counts By Corinne T. Netzer This book lists all you need to know about foods. Including , calories, fat grams, protein grams , carbohydrate grams, fiber grams, sodium and cholesterol
324
It depends on what chips or fries, how much sodium it contains, and what extra ingredients it contains. If you get them from a restaurant, then they will have a guide for calorie count on their food. If you get them from ex: Frozen Food at grocery store; it will be on packaging. Make sure to look at serving sizes.
howmanycalories.com
How many calories are in a food which has 10 grams of protein, 4 grams of fat, and 20 grams of carbohydrate