How to Create an Inventory Reorder Tracker in Excel

Recommended tracker fields

Field	Purpose
SKU	Unique stock identifier used to match counts, purchase orders, and item history.
Item	Plain-language item description so the SKU and unit of measure can be verified quickly.
Supplier	Primary replenishment source used for lead-time and purchasing decisions.
Current Stock	Latest verified on-hand quantity before open orders or commitments are considered.
Reorder Point	Stock threshold that triggers a replenishment review.
Lead Time Days	Expected number of days between ordering the item and receiving it.
Average Daily Use	Normal demand rate used to estimate consumption during lead time.
Safety Stock	Extra buffer kept for demand or delivery uncertainty.
Recommended Order	Calculated quantity suggested after demand, lead time, safety stock, and current stock are considered.
Status	Action label such as OK or Reorder that tells the buyer which items need attention.

Build the workflow

1. Create a unique SKU for every stock item.
2. Record current on-hand quantity from a controlled source.
3. Calculate or approve average usage and lead time.
4. Set safety stock and reorder point.
5. Calculate a recommended order quantity.
6. Flag items at or below the reorder point.
7. Review open purchase orders before placing another order.

Useful formulas

Reorder status: =IF([@[Current Stock]]<=[@[Reorder Point]],"Reorder","OK")

Suggested quantity: =MAX(0,([@[Average Daily Use]]*[@[Lead Time Days]]+[@[Safety Stock]])-[@[Current Stock]])

For more complex status rules, extend the same pattern with an IF formula using AND and OR.

Common tracker mistakes

Mistake	Impact
Using current stock without open orders	The recommendation can overstate needs.
Using one lead time for every supplier	Risk differs by item and supplier.
Ignoring unit of measure	Cases and individual units can be mixed.
Treating all demand as stable	Seasonality and promotions need overrides.
Not recording stock-count date	Old balances look current.

Worked reorder example

Suppose an item has 42 units on hand, average daily use of 8, lead time of 5 days, and safety stock of 20. Expected demand during lead time is 40 units, so demand plus safety stock is 60. The suggested order from the formula is MAX(0,60-42), or 18 units. If 12 units are already on an open purchase order, the additional recommendation should be reduced accordingly.

For a related summary workflow, use SUMIFS to summarize stock movements across dates or item categories.

That example also shows why reorder logic should not use only Current Stock. Available inventory may need to consider committed customer orders, inbound purchase orders, minimum order quantities, case packs, or supplier constraints. Keep those adjustments visible in separate fields rather than burying them in one long formula. The goal is not a mathematically perfect order quantity; it is a recommendation that a buyer can review and trace back to current stock, demand, lead time, and safety stock.

Frequently asked questions

What is a reorder point?

It is the stock level that triggers replenishment, usually based on demand during lead time plus safety stock.

How do I include open purchase orders?

Subtract expected inbound quantity from the recommended order or add an Available After Orders field.

Can I track expiry dates?

Yes, but batch-level records may be required.

How often should the tracker update?

As often as stock movements and purchasing decisions require.