Fat is a necessity in your diet. While you don’t want to eat more than a certain amount each day, the University of Florida says you do need some in order to properly absorb vitamins from food. Food nutrition labels in the United States already list both the number of grams of fat per serving and the calories from fat per serving. If you plan to eat more or less than what the manufacturer has deemed a serving, you must recalculate the numbers to find the calories from fat for your customized serving size.
Step 1
Find the number of fat grams per serving on the nutrition label. If you are trying to calculate the calories from fat for a recipe for which you have only a total number of fat grams--for example, a homemade recipe for which you can add up the fat grams in individual ingredients for a total number--use that figure for these calculations.
Step 2
Multiply the number of fat grams per serving by the number of servings. This gives you the total number of fat grams in the entire batch or package. Skip this step if you already have a total number of fat grams, such as for the example homemade recipe in step 1.
Step 3
Multiply the total number of fat grams by 9. One fat gram has 9 calories. In contrast, carbohydrate and protein grams have only 4 calories. This figure will give you the total number of calories from fat in the entire recipe, batch or package.
Step 4
Calculate the percentage or proportion you plan to eat. For example, if you plan to eat three egg rolls out of a package of 12, you’re planning to eat 25 percent. Convert this into a decimal by dividing by 100. In this example, 25 divided by 100 equals 0.25.
Step 5
Multiply the total number of calories from fat, from step 3, by the decimal figure. For example, if the package of 12 egg rolls has 60 g of fat total, or 540 total calories from fat, multiply 540 by 0.25. This gives you 135 calories from fat in the three egg rolls you plan to eat.
Member Comments