Safety Stock Service Level Formula is the equation used to calculate the number of items needed in stock to guarantee a certain service level. The formula takes into account the demand per unit time and how quickly this demand must be met. By determining how many items need to be kept in stock, businesses can ensure that customers have access to the products they need when they need them. Furthermore, it helps businesses manage their inventory in an efficient way, balancing costs versus customer service satisfaction. Ultimately, the Safety Stock Service Level formula ensures that businesses are able to find the perfect balance between cost-efficiency and providing customers with the products they need.