A blending method is described for preparing a blended mixture. The blending method for preparing a blended mixture, the method includes: providing a control system having at least a processor, a computer-readable memory, and a display, wherein the memory contains software configured to receive a formula defining instructions for preparing a blended mixture using one or more blending materials and amounts for producing a batch size of the blended mixture on a scale; monitoring a weight on the scale as blending materials are added to a receptacle on the scale, both individually and in total; indicating on the display the amounts of the blending materials that have been added to the scale, both individually and in total, to prepare an amount of a custom blended mixture based upon the selected blending materials; determining an end weight of the custom blended mixture after a user has used the custom blended mixture; and recalculating a needed amount of the custom blended mixture by subtracting the end weight of the custom blended mixture from the prepared amount of the custom blended mixture.