1. Reorder point
Average daily demand × lead time + safety stock
Estimates the inventory position at which a buyer should act.
Free inventory planning tool
Reorder point calculator and replenishment planner.
Calculate when to reorder inventory and estimate a purchase quantity using demand, supplier lead time, safety stock, on-hand units, incoming stock, reservations, and backorders.
What you will calculate
Demand during supplier lead time
Reorder point and current inventory position
Available weeks of supply
A reviewable suggested order quantity
This is a planning estimate. Review case packs, supplier minimums, seasonality, storage, cash, and data quality before ordering.
Replenishment result
When to reorder and how much to review
Reorder point
92 units
Lead-time demand + safety stock
Inventory position
72 units
On hand + incoming − reserved − backordered
Suggested order
68 units
Target stock − inventory position
Weeks of supply
2.2 weeks
Available units ÷ average demand
The inventory position is at or below the reorder point.
Review a purchase of 68 units against case packs, minimums, cash, and seasonality.
Demand during lead time4 × 18 days72 units
Reorder point72 + 20 safety stock92 units
Target stock4 × 30 days + safety stock140 units
Apply this across your catalog
Move from one calculation to a buyer-ready replenishment list.
Inskeep connects demand, inventory, incoming purchase orders, vendor details, and suggested quantities so buyers can review the products that need attention together.
Explore replenishment softwareTransparent formulas
How the reorder point calculator works.
2. Inventory position
On hand + incoming − reserved − backordered
Accounts for stock already committed and stock genuinely on the way.
3. Suggested quantity
Target stock − inventory position
Estimates a quantity to review after choosing the desired coverage period.
A formula is only as useful as its inputs. Review unusual demand, late purchase orders, supplier minimums, case packs, seasonality, promotions, storage constraints, and available cash before committing inventory dollars.
Frequently asked questions
Reorder point and replenishment questions.
What is a reorder point?
A reorder point is the inventory position at which a buyer should place a replenishment order so new stock can arrive before expected demand consumes the available supply.
What is the reorder point formula?
A common starting formula is average daily demand multiplied by supplier lead time in days, plus safety stock. The result should be compared with inventory position rather than on-hand quantity alone.
Why does the calculator use inventory position?
Inventory position includes on-hand and confirmed incoming units, then subtracts reserved inventory and backordered demand. This helps avoid buying unnecessarily when stock is already incoming or waiting too long when existing units are committed.
How much safety stock should I use?
Safety stock depends on demand variability, supplier reliability, lead-time variation, forecast accuracy, and the cost of stocking out. Use a deliberate business rule and review it when demand or supplier performance changes.
Is the suggested order quantity the same as the reorder point?
No. The reorder point estimates when to buy. The suggested quantity estimates how much to buy by subtracting the current inventory position from a target stock level.