It is sometimes stated that you can subtract all of the percentages on the label from 100 percent in order to give you an approximate percentage of the carbohydrates contained in any product. In other words, subtracting the protein, fat, water, fiber, and ash/mineral content from 100 percent will leave you with the percentage of carbohydrates contained in the diet in the diet on a ‘wet matter’ or ‘as fed’ basis. However, because the guaranteed analysis values are only listed as minimums and maximums with no ‘floor’ or ‘ceiling,’ you can see where this type of calculation can lead to a very erroneous conclusion with respect to the carbohydrate content. Also, you need to convert this number to dry matter basis or ‘calories from’. If you use ‘as fed’ values, they will be misleadingly low.