Reorder Point
Free online reorder point calculator for inventory management. Calculate the optimal inventory level to trigger new orders based on lead time, demand, and safety stock in seconds.
About This Calculator
The Reorder Point Calculator helps businesses and inventory managers determine the optimal stock level at which a new purchase order should be placed. By considering your basic stock coverage, safety stock buffer, supplier lead time, and daily unit sales, this calculator ensures you reorder inventory at the right moment — preventing costly stockouts and minimizing excess holding costs.
The reorder point formula used is: Reorder Point = (Safety Stock + Basic Stock + Lead Time) × Unit Sales per Day. For example, a business with 10 days of basic stock, 3 days of safety stock, 5 days lead time, and 50 units sold daily should reorder when inventory drops to (10 + 3 + 5) × 50 = 900 units. This tool is essential for retailers, wholesalers, e-commerce sellers, manufacturers, and any business managing physical inventory across India, the US, and the UK.
Regional Notes
India: Businesses in India should consider GST filing cycles and local transport delays when setting lead times. Many Indian retailers adjust safety stock during festival seasons (Diwali, Dussehra) when demand spikes 30-50% above average.
United States: US businesses often factor in interstate shipping times and seasonal demand patterns like Black Friday and holiday shopping. Many US retailers use reorder points alongside just-in-time (JIT) inventory systems.
United Kingdom: UK businesses should account for potential Brexit-related customs delays when setting lead times for imported goods. Safety stock levels may need adjustment during holiday seasons and sales events like Boxing Day.
Frequently Asked Questions
What is a reorder point?
A reorder point is the minimum inventory level at which a new order should be placed to replenish stock before it runs out. It is calculated as (Safety Stock + Basic Stock + Lead Time) multiplied by Unit Sales per Day.
How do you calculate the reorder point?
The reorder point formula is: Reorder Point = (Safety Stock in Days + Basic Stock in Days + Lead Time in Days) × Unit Sales per Day. For example, if safety stock is 3 days, basic stock is 10 days, lead time is 5 days, and daily sales are 50 units, the reorder point is (3 + 10 + 5) × 50 = 900 units.
What is safety stock and how does it affect the reorder point?
Safety stock is extra inventory kept to protect against unexpected demand spikes or supply delays. It increases the reorder point because you need to account for these buffer days. A higher safety stock raises the reorder level, reducing stockout risk but increasing holding costs.
What is lead time in reorder point calculation?
Lead time is the period between placing an order with a supplier and receiving the goods. It is measured in days and directly impacts the reorder point — longer lead times mean you need to reorder earlier (at a higher inventory level) to avoid stockouts.
Is the reorder point the same as the economic order quantity?
No. The reorder point tells you when to reorder (the inventory level that triggers a purchase order), while the economic order quantity (EOQ) tells you how much to reorder. Both are used together for effective inventory management.
Why is reorder point important for businesses?
Setting the right reorder point prevents stockouts (lost sales and customer dissatisfaction) and minimizes excess inventory holding costs. It ensures smooth operations, especially for perishable goods, high-demand items, and products with long supplier lead times.
Can I use this calculator for any type of business?
Yes, this reorder point calculator works for any business that manages inventory — retail stores, warehouses, e-commerce sellers, manufacturers, and restaurants. Adjust the safety stock, basic stock, lead time, and daily unit sales to match your specific products and supply chain.
How often should I update my reorder point?
You should review and update your reorder points whenever there are changes in supplier lead times, demand patterns, seasonality, or your safety stock policy. Many businesses review reorder points quarterly or whenever they introduce new products or suppliers.