Know exactly when to reorder and how many units — suggested restock quantity, reorder-by date, stockout loss, and a long-term storage fee (LTSF) alert when your cover stretches past 270 days. No login, no data sent anywhere.
Planning estimate only. Cover is (sellable + inbound) ÷ daily sales. No data ever leaves your device — everything runs in this page.
SKU|dailySales|sellable|inbound|transit|leadAmazon runs long-term storage fee (LTSF) sweeps on the 15th of February and the 15th of October. Units older than 180 days also face a monthly aged inventory surcharge, and units aged 271 to 365 days incur LTSF of roughly $0.24 per cubic foot, while units aged 365 days or older are charged around $6.90 per cubic foot on sweep day. This tool flags SKUs whose days of cover exceed 270 so you can discount, remove or liquidate before the next sweep. Use days of cover (sellable plus inbound divided by daily sales) as an early-warning proxy; confirm exact unit age in Inventory Health.
Reorder when your remaining cover falls below transit time plus supplier lead time plus your safety stock buffer. In practice, order by the date this calculator shows: today's cover minus head-haul transit days minus supplier lead days. If that date is today or in the past, you are already late and risk a stockout while the next shipment is on the water.
Most sellers keep 45 to 60 days of sellable cover: enough to survive a 20 to 35 day ocean head-haul plus a 15 to 30 day supplier lead time, plus a small buffer for sales spikes. Under 30 days risks stockouts; over 90 days ties up cash and pushes you toward aged-inventory surcharges and LTSF after 270 days.
Target cover in days multiplied by daily sales gives the units you want on hand. Subtract current cover (sellable plus inbound already moving to the warehouse) and subtract the inbound shipment already on its way. The result is rounded up to the nearest case or ten units. Formula: suggested = max(0, (targetDays minus currentCover) times dailySales minus inbound), rounded up to the next 10 units.
Each day out of stock loses you daily sales volume times your unit gross profit, plus the Buy Box and ranking damage that lingers for days after restock. This tool estimates the direct loss as stockout days times daily units times gross profit per unit — the ranking hit on top of that is usually larger. A 20-day stockout on a 10-unit-per-day product at $8 margin is $1,600 in direct lost profit before any rank loss.
Not affiliated with Amazon. As an Amazon Associate I earn from qualifying purchases. Tool results are planning estimates, not Amazon quotes. No data ever leaves your device.