Free inventory calculator
Reorder point calculator for small business inventory
Work out when to reorder a product before supplier lead time puts you at risk. Use the calculator for one SKU, then use QuikStock to rank a full weekly buying list.
Free to use · No signup · CSV import & export
Formula example
Worked formula example
120 units sold in 30 days with a 14-day lead time and 7-day safety stock — reorder when stock falls to 84 units.
Calculator
Reorder point = (daily velocity × lead time) + (daily velocity × safety stock days).
Result
Reorder when stock on hand plus incoming purchase orders falls to this level.
- Daily sales velocity
- 4.0 units/day
- Lead time demand
- 56 units
- Safety stock
- 28 units
Got one SKU figured out? Plan all of them at once — QuikStock applies this formula across a CSV and groups items by supplier.
Plan multiple SKUs →The reorder point formula is simple. The weekly buying decision is harder.
A reorder point tells you the stock level where you should place the next order. In practice, retailers also need to compare every SKU, supplier lead time, case pack, open purchase order, and cash constraint before buying.
Calculate the trigger
Use recent sales, the number of days in the sales period, lead time, and safety stock days to estimate the reorder point.
Account for lead time
The reorder point should cover demand while you wait for the supplier, plus a buffer for normal sales variation.
Move from one SKU to a plan
QuikStock applies the same logic across a CSV and groups the items that need attention by supplier.
Formula
Reorder point = lead time demand + safety stock.
- Lead time demand = daily sales velocity × supplier lead time
- Daily sales velocity = units sold ÷ days in the sales period
- Safety stock can be estimated as extra days of cover
When it helps
A reorder point is useful when demand is reasonably repeatable and supplier lead time matters.
- Fast-moving retail products
- Supplier orders that take days or weeks
- Items where running out creates missed sales
Where it falls short
A single-SKU calculator does not decide what to buy this week across the whole store.
- It does not group orders by supplier
- It does not size orders to case packs or MOQs
- It does not rank urgent items against cash constraints
Common questions
Other planners and tools
Multi-SKU tool
Weekly reorder plan generator
Apply the same formula to a whole CSV. Ranks urgency by SKU and groups orders by supplier.
For spreadsheet users
Inventory planning spreadsheet alternative
When a one-off reorder point is no longer enough and the weekly review becomes repetitive.
Vertical example
Pet supply store reorder planner
Worked example for repeat-purchase staples like food, litter, and treats with case packs.
Free tool
Move from one SKU to a full weekly plan
Drop a CSV with your stock and recent sales — QuikStock applies this same formula across every SKU and ranks what to buy this week, grouped by supplier.
Design partner program
Want this saved every week?
Saved plans (remembered suppliers, lead times, weekly reminders) are in active development. Tell us your email and we'll bring you in early — and ask what you'd want from it.