Free tools / Inventory Reorder Point Calculator
Free browser-based calculator
Inventory Reorder Point Calculator
Estimate when to reorder stock using average daily usage, supplier lead time, safety stock and coverage days.
Your estimate
Calculating...
How to use this tool
The reorder trigger is average daily demand × supplier lead time + safety stock. The calculator compares this with your inventory position (stock on hand + incoming orders).
If stock is at or below the trigger, it estimates a top-up quantity toward target coverage. Confirm order quantities with suppliers.
Assumes a stable daily demand and lead time. It does not forecast seasonal swings, pack sizes, economic order quantities or minimum order quantities.
Frequently asked questions
Why include stock already on order?
Including confirmed incoming stock can prevent duplicate or unnecessary purchases.
Is suggested quantity an exact purchase order?
No. Adjust for MOQ, pack sizes, cashflow and expected demand.