If a food is labeled 97 percent fat-free, that means 3 percent of its weight comes from fat.
Food labels can be misleading.
To calculate the percentage of fat calories use the calorie information on the food label. Divide the number of calories from fat by the total number of calories and multiply by 100. For example, one 97 percent fat-free luncheon meat derives 15 of its 60 calories per serving from fat.