Use this calculator to determine the amount of calories in a serving using the analytical constituents or guaranteed analysis. This calculator determines the dry matter content of the food and the amount of metabolisable energy in that dry matter based on energy available from protein, fats and carbohydrates.
Under European Law, pet food manufacturers are required to list analytical constituents on cat and dog feeds, supplements and treats. These values represent the minimum or maximum (depending on the nutrient) content as a percentage. This is similar to the Guaranteed Analysis listed on American pet foods.
See below for some examples of how these values are listed on pet food/treats packaging.