Calculating calories from fat in foods can be accomplished by reading food labels and attributing fat calories from other sources in the packaging. Because food manufacturers are required to label foods, any fat or other caloric sources are displayed on the packaging. These nutritional facts on the labels are used to calculate calories and fat content.
Step 1
Note the nutrition label row that indicates the amount of fat. The "Total Fat" line includes unsaturated and saturated fats. This is the total grams of fat included in the content. The "Saturated Fat" area is important, because saturated fats should be avoided. Avoid foods with high saturated fat content indicated on the label. Multiply the fat grams by nine. This is the total amount of calories from the fat molecules.
Step 2
Note the total grams of protein in the package. Multiply this number by four. This is the total amount of calories from the protein content.
Step 3
Note the total amount of carbohydrates indicated on the food label. Sugars are essential for energy, but sugars should also be eaten in moderation. Multiply the total gram amount by four. This is the total amount of calories from the sugars.
Step 4
Add the total calories calculated from Steps 1 through 3. The fat content is indicated in Step 1, and the total calories are the fats, carbohydrates and proteins consumed. This number is the total calories.
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