Free Reorder Point Calculator: Know Exactly When to Reorder
Running out of a best seller costs you sales, while ordering too soon locks up cash in boxes that sit on a shelf. This free reorder point calculator shows the exact stock level that should trigger your next purchase, so you know exactly when to reorder each product instead of relying on gut feeling.
Enter how many units you sell on a typical day, how many days your supplier usually takes to deliver, and how many spare units you keep in reserve. The result appears instantly. Add your current stock as well, and the tool tells you whether to order today or how many selling days you have left before you should.
Free to use · Works on phone and desktop · Nothing is saved or shared
Find your reorder point
Fill in the first two boxes. The other two are optional.
How to use this reorder point calculator
You don't need a spreadsheet or a finance background to use this reorder point calculator. Everything it asks for already exists in your sales records and your recent supplier invoices, so collecting the inputs usually takes only a few minutes per product.
Find your daily sales
Add up the units you sold over the last 30 to 90 days, then divide by the number of days in that period. Choose a typical stretch rather than a holiday rush or a quiet month.
Check delivery time
Count the days between placing an order and having the goods ready to sell. Base it on what actually happened with recent deliveries, not on the supplier's quoted estimate.
Add your reserve
Enter the spare units you keep for unexpected demand or late trucks. If you hold none, leave the box empty, and the tool will explain the risk you're taking.
Read the result
When stock falls to the number shown, place your next order. Add today's count to see how many selling days remain before that moment arrives.
A worked example
A small coffee roaster sells about 40 bags of its house blend each day, and its supplier takes 6 days to deliver fresh beans. The owner also keeps 60 extra bags in reserve, in case a café orders more than usual or a delivery truck runs late.
While the roaster waits for beans, it will sell roughly 240 bags (40 × 6). Adding the 60 reserve bags gives a trigger level of 300. When the count falls to 300 bags, the owner places the next order, and the new delivery should arrive just as the shelf approaches the reserve.
Today the roaster has 520 bags, which is 220 bags above the trigger, or about 5 days of normal sales. There's no need to order today, but the purchase should go out before the end of the week. Typing the same numbers into the reorder point calculator above gives the identical answer.
Why the right trigger level matters
Most stock problems come down to timing rather than quantity. A reorder level calculator removes the guesswork from that timing, which matters because both of the mistakes below cost real money.
Ordering too late
The shelf empties before the delivery arrives, so customers leave, buy from a competitor, and may never return. You may also pay expensive rush shipping to fill the gap. A single empty week on a popular product can wipe out a month of its profit.
Ordering too early
Products pile up and absorb cash you could spend on marketing, wages, or new lines. They occupy valuable space and can go stale, expire, or fall out of fashion, while you keep paying to store and protect goods that aren't earning anything yet.
Tips for getting accurate numbers
Any reorder point calculator is only as reliable as the figures you give it. These habits keep your trigger levels realistic as your business changes.
- Use recent sales. Last year's figures may not reflect current demand, so a 30 to 90 day window works well for most products.
- Track actual delivery times. If a supplier promises 5 days but regularly takes 8, enter 8. Late deliveries cause more empty shelves than busy days do.
- Plan for seasonal swings. Recalculate before your busiest months, because a trigger that works in March may be far too low in December.
- Protect important products. A few days of extra stock keeps your best sellers available when demand jumps or a shipment slips.
- Review every month. Sales patterns and suppliers change over time. Run the ROP calculator again each month, or whenever something significant shifts.
- Treat each product separately. A fast seller from a local supplier needs a very different trigger from a slow item shipped from overseas, so never copy one number across your whole range.
Stop checking stock by hand
A reorder point calculator gives you the number once, but InventorysHub watches it every day. Set a trigger level for each product, receive an alert the moment stock drops to it, and turn that alert into a purchase order in a few clicks.
Frequently asked questions
How does this reorder point calculator work?
The reorder point calculator multiplies your average daily sales by your supplier's delivery time in days, which shows how much you will sell while you wait. It then adds your reserve units. The total is the stock level at which you should place your next order.
What numbers do I need?
You need your average daily sales and your typical delivery time in days. Reserve units and current stock are optional, although adding current stock lets the tool tell you how many days remain before you need to order.
What if I don't keep any reserve stock?
The tool still works, and your trigger level will simply equal the units you sell while you wait. However, any late delivery or unusually busy day will leave you short, so the result includes a warning. Most businesses keep at least a few days of extra stock on important products.
Is a reorder level calculator the same as this tool?
Yes. Reorder level and reorder point mean the same thing, since both describe the stock count that should trigger a new order. So a reorder level calculator and this tool give the same answer, and some people simply call it a ROP calculator.
How often should I work out my reorder point again?
Check it at least once a month and before any busy season. You should also recalculate whenever a supplier changes its delivery times or sales of a product rise or fall sharply.
Can I set a reorder point for every item automatically?
Yes. In InventorysHub you can set a trigger level on every product and receive an alert as soon as stock reaches it, so nothing runs out by surprise.
More free stock tools
Your trigger level is one part of the picture, and these tools answer the questions that usually follow. Want the full math with more examples? Read our step-by-step guide.