AMZ workflow notes
How the restock planner helps avoid stockouts
The restock calculator converts daily sales, current FBA stock, inbound inventory, factory lead time, shipping time, and receiving time into a practical reorder plan. It highlights whether the latest order date has already passed and how much stock is needed for the target coverage period.
Use it when sales velocity changes, before seasonal campaigns, or when freight lead times become unstable. It gives a conservative planning view so you can compare air, sea, and supplier production schedules before committing cash.
What to check before acting on the result
- Confirm the correct marketplace and currency.
- Compare the estimate with Seller Central fee previews when available.
- Update CPC, conversion rate, and lead times after each campaign or shipment.
- Keep a safety buffer for returns, coupons, and slower receiving windows.
FAQ
Can this replace Seller Central data?
No. It is a planning tool for quick checks. Use Seller Central, supplier invoices, and actual advertising reports for final decisions.
Is my input stored?
No. The tool runs locally in your browser and does not require an account.
What should I verify before using a result?
Confirm the marketplace, current fees, advertising assumptions, lead times, and product availability in Seller Central before making a final decision.
Restock formula and worked inventory example
Restock quantity = max(0, target inventory - available stock - inbound stock). Target inventory is estimated daily sales multiplied by target stock days. Stock coverage is available plus inbound units divided by estimated daily sales. The calculator also adds factory, shipping, and receiving days to show the full replenishment lead time.
Example: a product selling 50 units per day with a 90-day target needs 4,500 units of target inventory. If 400 units are available and 300 are already inbound, the suggested restock quantity is 3,800 units. Those 700 units cover about 14 days. If production takes 10 days, shipping 7 days, and receiving 5 days, the total lead time is 22 days, so the order is already late unless sales slow or faster freight is used.
| Input to review | Use a reliable source | Why it changes the plan |
|---|
| Daily sales | Recent Seller Central units ordered | Promotions and seasonality can make a short average misleading. |
| Available and inbound stock | Inventory and shipment reports | Receiving delays mean inbound units may not be sellable yet. |
| Lead times | Supplier and freight forwarder estimates | Use realistic production, transit, customs, and check-in time. |
| Target stock days | Cash-flow and service-level plan | A larger buffer reduces stockout risk but ties up more cash. |
Use the result with profit and demand checks
A restock recommendation is a timing estimate, not a purchase order. Confirm unit economics in the FBA Profit Calculator, review the complete FBA restock planning guide, and compare recent conversion, returns, ad spend, and supplier minimums before committing inventory. Recalculate after a price change, campaign launch, shipment delay, or material shift in daily sales.