Effective inventory replenishment is a critical aspect of running a successful business. It involves maintaining an appropriate balance of inventory levels to meet customer demand while minimizing costs associated with carrying excess inventory. In this regard, inventory replenishment is an essential activity that businesses undertake to keep their shelves stocked and customers satisfied.
One of the key decisions in inventory replenishment is determining the reorder point and safety stock level. The reorder point is the minimum inventory level at which a company should order more inventory to avoid stockouts. The safety stock level is the additional inventory that a company keeps on hand to protect against unexpected fluctuations in demand or supply chain disruptions. Let us see how to calculate the reorder point and safety stock level in inventory replenishment.
Calculating the Reorder Point
The reorder point is a crucial factor in inventory replenishment as it helps businesses avoid stockouts and keep customers satisfied. There are several methods for calculating the reorder point, but the most common method is the basic formula:
Reorder Point = (Average Daily Usage x Lead Time) + Safety Stock
where,
Average Daily Usage = The average quantity of the product sold per day
Lead Time = The time it takes for an order to arrive after it has been placed
Safety Stock = The additional inventory held to cover unexpected demand or supply chain disruptions.
When using the reorder point formula, there are several crucial factors to bear in mind. Firstly, obtaining precise data on average daily usage and lead time is critical, which can be achieved by analyzing historical sales data and assessing supplier performance metrics. Secondly, to ensure accuracy, it’s important to periodically review and modify the reorder point to account for shifts in demand, lead times, or safety stock levels.
Calculating Safety Stock
Safety stock is a reserve of inventory that inventory planners maintain to manage the impacts of changes in demand. This buffer inventory is designed to mitigate the effects of variations that occur due to different factors, such as fluctuating demand and delivery lead times from suppliers. The determination of the appropriate safety stock level is not arbitrary but based on a specific formula. The formula is a function of the average daily usage of the inventory item and the variance in supplier lead times.
Safety Stock = (Maximum Daily Usage x Maximum Lead Time Days) — (Average Daily Usage x Average Lead Time Days)
To determine the safety stock level, the safety stock equation considers various factors such as the highest and average daily usage, as well as the longest and average lead time. These values can be computed, but it’s crucial to choose a specific timeframe over which to calculate them.
Why Is a Reorder Point Essential?
Reorder points play a vital role in optimizing a business’s productivity and profitability. By ensuring that the appropriate amount of inventory is ordered, a business can operate efficiently and avoid wastage caused by excess stock. Accurate reorder points can significantly reduce carrying expenses, such as insurance and rental costs, and expenses related to maintaining inventory, including potential losses due to spoilage.
Calculating the reorder stock level helps to create cohesion among team members when multiple individuals are responsible for making purchasing decisions.
How to Calculate Reorder Level?
The following are the steps to be followed while calculating the reorder point:
Calculate the Lead Time
Lead time refers to the time between placing an order and receiving the shipment. It’s important to determine the lead time using the same unit of measurement as the average demand. For instance, if the average demand is 100 items per day, the lead time should be measured in days. If the average demand is measured in weeks, then the lead time should also be in weeks.
If the delivery time is consistent, you can simply review the order and delivery records to calculate the lead time. However, if delivery times vary, you will need to calculate the average time between placing the order and receiving the products. If external factors affect the lead time, different lead times can be used and managed using an efficient inventory planning software
Gauge the Average Demand
Calculating the average demand for a specific product involves determining the quantity of that product sold within a specific period, such as daily, monthly, or yearly. To account for variations in demand over time, it’s important to calculate inventory usage in multiple selected periods and then average those numbers. This approach is particularly crucial for products that are susceptible to external factors.
Maintaining a Safety Stock
To calculate the reorder point for inventory replenishment in a restaurant, the formula used depends on whether a safety stock is desired or not. A safety stock is a reserve of products kept on hand to meet unexpected increases in demand or delayed supplier deliveries. It’s important to compare the inventory level with the quantity sold to determine whether a safety stock is already included. It’s also recommended to consult with business leaders to clarify the company’s policy on safety stock and whether it should be factored into the reorder point calculation. This approach can help ensure optimal inventory replenishment in a restaurant.
Utilze the Formula for Reorder Point
Calculating the reorder level in a restaurant requires considering factors such as average demand, safety stock, and lead time, using the relevant formula. To ensure accuracy, it’s important to use consistent time units for lead time and average demand. It’s also advisable to seek assistance from a team member or work collaboratively to ensure the calculations are correct. This approach can help ensure optimal inventory replenishment in a restaurant.
Make Alterations as Required
For effective inventory replenishment in a restaurant, it’s crucial to regularly analyze the reorder point and make adjustments as needed. If there’s an increase in demand that requires restocking before the next order, it’s important to recalculate the reorder point accordingly. Additionally, if orders are being received earlier or later than expected, modifications and adjustments to the reorder point may be necessary. This approach helps to ensure that inventory levels are maintained at optimal levels to meet customer demand.
About the Company
Fountain9 offers retailers a solution for effective inventory planning that enables them to meet customer demand efficiently. Using their AI-powered demand & Inventory planning software, Kronoscope, businesses can accurately predict the demand and automate comprehensive purchase planning at the most granular level across the entire supply chain determining the required stock levels to meet that demand.
Kronoscope uses a proprietary dynamic norm recommendation engine that uses shelf life, replenishment lead time, and predicted demand to suggest the replenishment quantities and inventory norms (safety stock days, Days on hand norms) which is optimized for each SKU-location combination. This allows for effective calculation of the reorder threshold, ensuring that customer expectations are met and business revenue is maximized.
