Free Reorder Point Calculator
Know exactly when to restock
Enter your average daily sales and supplier lead time to instantly find the stock level at which you must reorder — so you never run out of inventory again.
What Is a Reorder Point Calculator?
A Reorder Point Calculator tells you the exact stock quantity at which you should place a new purchase order with your supplier. It uses your average daily sales and supplier lead time to ensure stock arrives before you run out. Add a safety stock buffer to handle demand spikes or supplier delays. Setting the right reorder point is one of the most effective ways to prevent costly stockouts without overstocking your storage space.
How to Find Your Reorder Point in 3 Steps
Step 1 — Enter Average Daily Sales
How many units of this product do you sell per day on average? If you sell 30 units a week, your daily sales = 30 ÷ 7 ≈ 4.3 units/day.
Step 2 — Enter Lead Time
Lead time is the number of days it takes from placing a purchase order with your supplier to receiving the stock in your store or warehouse.
Step 3 — Set Safety Stock (Optional)
Safety stock is a buffer to cover unexpected demand spikes or supplier delays. Leave it at 0 if you have a reliable supplier and steady demand.
Who Uses This Reorder Point Calculator?
Retail Shop Owners
Know exactly when to reorder each product so shelves are never empty during peak demand.
Warehouse & Store Managers
Set reorder alerts in your inventory system at the calculated ROP for each SKU.
Pharmacy Owners
Keep critical medicines in stock by calculating reorder points based on prescription rates and supplier lead times.
E-commerce Sellers
Prevent out-of-stock listings that hurt search rankings and sales by ordering at the right time.
Frequently Asked Questions
What is a reorder point?
The reorder point (ROP) is the minimum stock level at which you must place a new purchase order to avoid running out before the next delivery arrives. Formula: ROP = (Average Daily Sales × Lead Time) + Safety Stock.
What is safety stock?
Safety stock is extra inventory you keep as a buffer against demand spikes or supplier delays. It prevents stockouts during unexpected situations. A common rule is 1–2 weeks of average sales.
How do I calculate average daily sales?
Add up total units sold over a period (e.g. 30 days) and divide by the number of days. Example: 900 units sold in 30 days = 30 units/day average.
What is lead time in inventory?
Lead time is the total time from placing a purchase order to receiving the goods. It includes supplier processing time, production (if applicable), shipping, and any customs clearance.
What happens if I go below the reorder point without ordering?
You risk a stockout — running out of inventory entirely. This leads to lost sales, unhappy customers, and potential damage to your business reputation.
Is this reorder point calculator free?
Yes, completely free. No login or account needed.