A computerized system, method, and computer-readable media implementing a method for determining a weight of a product, and optionally its shipping weight and postage are described. A product having a variable shape in two dimensions wherein the shape is defined in the two dimensions by a set of cutlines is manufactured from a product blank of known weight. The weight of the product is determined from the number of pixels in a scaled image of the cutlines, the image having the same aspect ratio as the product blank. The weight of the product blank and the ratio of the pixels corresponding to product surface area relative to the total number of pixels in the image are used to calculated the actual weight of the product.