In one embodiment there is provided a system for recalculating a formula previously used in preparing a mixture made from adding at least two components. The system includes a control apparatus and scale. The control apparatus has a memory for storing the mixture formula. The scale, in communication with the control apparatus, allows the control apparatus to monitor a weight on the scale, such that a final weight of the mixture is stored on the memory. When an end weight of the mixture, defined to be the final weight of the mixture previously prepared minus an amount used by a user, is positioned back on the scale and when the control apparatus receives a recalculation signal, the control apparatus calculates the amount used, recalculates the mixture based on the amount used, and stores a new mixture for subsequent use.