Lead-time demand
Estimates the units likely to be sold or consumed while you wait for the next delivery.
Inventory planning tool
Inventory Reorder Point Calculator
Determine exactly when to reorder inventory using demand, supplier lead time, safety stock, service level, and current stock availability.
- Lead-time demand
- Three safety-stock methods
- Reorder timing and stock status
Inventory inputs
Enter demand, lead time, stock, and your preferred safety-stock method.
Demand and lead time
units/day
days
units
units
units
days
Safety-stock method
units
units/day
days
units
Suggested replenishment
days
units
units
$
Inventory control
Replenish stock before demand creates a shortage
The inventory reorder point is the stock level that triggers a new purchase order. It combines expected demand while a supplier is delivering with an additional buffer for uncertainty.
Safety-stock buffer
Adds protection against demand spikes, delivery delays, and forecast uncertainty.
Inventory position
Adjusts on-hand stock for incoming purchase orders and committed or backordered units.
Days until reorder
Shows how long current inventory can support demand before the reorder trigger is reached.
Suggested order quantity
Estimates replenishment needs using desired stock coverage, MOQ, and case-pack multiples.
Purchase-order value
Multiplies suggested units by cost per unit to estimate replenishment cash required.
Inventory reorder point formula
For continuously monitored inventory, reorder point equals expected lead-time demand plus safety stock. Add review-period demand when inventory is checked only periodically.
Reorder Point = Lead-Time Demand + Review-Period Demand + Safety Stock
How it works
Calculate your reorder point in four steps
1
Enter average demand
Add average units sold per day and your supplier's normal lead time.
2
Choose safety stock
Enter a known buffer or estimate it from maximum usage or service level.
3
Add current stock
Include on-hand inventory, incoming stock, backorders, and review delay.
4
Review the trigger
See reorder point, timing, status, suggested quantity, and order value.
Frequently asked questions
Inventory reorder point FAQs
The reorder point is the inventory level at which a replenishment order should be placed so new stock arrives before existing inventory is exhausted.
Multiply average daily demand by supplier lead time, then add safety stock. When inventory is reviewed periodically, also add expected demand during the review period.
Safety stock is extra inventory kept to protect against unexpected demand, supplier delays, forecast errors, damaged goods, and other disruptions.
Use manual safety stock when you already have a trusted buffer. Use maximum usage when peak demand and longest lead time are known. Use the service-level method when reliable demand history and standard deviation are available.
No. Reorder point answers when to order. Order quantity answers how many units to purchase. This calculator estimates both separately.
Review them whenever demand, lead time, seasonality, service targets, or supplier performance changes. Fast-moving products may require monthly or weekly review.