A computer-implemented method and system for calculating a safety stock quantity for several warehouses within an availability check during a delivery process of goods, wherein the safety stock quantity is representative of a quantity of products which is protected by the availability check, wherein the safety stock quantity is a combination of a predetermined safety stock quantity and a calculated safety stock quantity and the calculated safety stock quantity being a combination of the predetermined safety stock quantity, a percentage of the predetermined safety stock quantity, an expected demand quantity and a percentage of the expected demand quantity and wherein the safety stock quantity is calculated within the availability check using the predetermined safety stock quantity, the percentage of the predetermined safety stock quantity, the expected demand quantity and the percentage of the expected demand quantity for the respective delivery process of goods.