Inventory Weeks of Supply Calculator

Use one entity, currency, reporting period, accounting basis, and classification policy across every input. On-hand stock and weekly sales use one SKU and location scope. The selected sales window reasonably represents forward demand. Reconcile the figures to the same ledger, inventory system, or operating report. A correct formula can still mislead when gross and net amounts, timing, returns, taxes, freight, or acquisition boundaries differ.

More weeks means more coverage at the stated pace, not necessarily healthy stock; seasonality, lead time, service level, obsolescence, and receipts remain separate. Treat the output as one defined indicator and compare it only across consistently prepared periods. Product mix, seasonality, acquisitions, inflation, channel shifts, credit terms, write-offs, inventory methods, and management estimates can change the result without representing the same underlying operating movement.

No. This educational calculator applies disclosed arithmetic to supplied values; it is not an audit, forecast, valuation, inventory count, accounting conclusion, lending decision, or investment recommendation. Do not treat a static coverage ratio as a replenishment forecast or substitute for lead-time and safety-stock planning. Retain the source records, document the definition, test alternative assumptions, reconcile material differences, and obtain qualified review before relying on the result.