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On nutrition labels the FDA requires manufacturers to list the percentage of fat, carbs, protien, etc. on a per serving basis. The ways of calculating that is by weight or by calories, by calories is more accurate measure of content. Most manufacturers use weight because it makes it appear as lower in fat than by calories do. This calculator figures percentage by calories using the standards of 9 calories per gram of fat, 4 for protien and 4 for carbs.