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Step 1: Look at the food label and identify the total calories per one serving and the grams protein per one serving. Total calories for 1 cup of macaroni & cheese is 250 calories. There are 5 grams of protein per serving.
Step 2: Figure the amount of calories the 5 grams of protein provide. We know that 1 gram of protein provides 4 calories. So, we multiply 5 grams of protein by 4 to get the amount of calories provided by protein in one serving of macaroni & cheese. Five multiplied by four equals 20 calories. We now know that 1 cup of macaroni & cheese provides a total of 250 calories, of which 20 calories come from protein.
Step 3: Figure the percentage of calories that come from protein. We will divide the calories from protein by the total calories. Twenty divided by two hundred fifty equals 0.08. Now we need to convert this decimal to a percentage by multiplying by 100, and we get 8%. This means 1 cup of macaroni & cheese is 8% composed of protein, or 8% of the calories come from protein.
