Inventory Shrinkage Calculator

For online merchants the usual suspects differ from retail stores: receiving errors (supplier short-ships booked at full quantity), warehouse damage and disposals never written off, returns restocked in the system but not physically resellable, fulfillment picking errors, and employee or 3PL theft. Paperwork problems typically explain as much shrink as actual theft — which is good news, because process fixes are cheaper than security.

US retail as a whole runs roughly 1.4–1.6% of inventory value annually, and a well-run e-commerce warehouse should beat that — under 1% is achievable with barcode scanning and disciplined receiving. Treat 2% as an action threshold and anything above 3% as a fire: at a 30% margin, every $1,000 of shrink requires over $3,300 of new sales just to earn back.

A full wall-to-wall count at least annually (your accountant will want it anyway), but cycle counting is what actually controls shrink: count a small rotating slice of SKUs weekly, prioritizing A-items and anything with recent discrepancies, so every SKU is verified several times a year. Cycle counts catch leaks in weeks instead of letting them compound invisibly for twelve months.

Negative shrinkage is almost always a paperwork artifact, not free inventory: unrecorded receipts, returns restocked without a system entry, an earlier count error, or units booked to the wrong SKU (check whether a sister SKU is short by the same amount). Investigate it as seriously as a shortage — the same broken process that adds phantom units this quarter can vanish real ones next quarter.