Foundational inventory management concepts for Amazon sellers, covering core principles, terminology, and essential practices.
TL;DR Amazon’s aged inventory surcharge, formerly called the long-term storage fee or LTSF, now starts at day 181 and escalates through eight age tiers. The January 2026 update raised the per-unit minimum on inventory older than 365 days from $0.15 up to $0.30 or $0.35 depending on age. If you are searching for “Amazon LTSF” […]
TL;DR ABC analysis for FBA ranks your Amazon SKUs by contribution to the business and groups them into three classes so each one gets a different inventory policy. A items get protection: high service levels, tighter buffers, weekly review, and bulk inventory staged in AWD or a 3PL when needed. B items get balance: standard […]
TL;DR Amazon FBA excess inventory is stock that stopped earning its keep. In most cases, that happens once a SKU passes 180 days without meaningful sales. You have four exit paths for Amazon FBA overstock: discount, liquidate, remove, or dispose. Prevention beats all four. Every Amazon FBA seller eventually finds some FBA excess inventory sitting […]
TL;DR Economic order quantity (EOQ) is the order size that minimizes the total cost of ordering and holding inventory. For Amazon FBA sellers, a standard EOQ calculation needs adjustment for FBA storage fees, aged inventory surcharges, and inbound placement costs. Getting this right means fewer wasted dollars sitting on warehouse shelves and fewer emergency reorders […]
TL;DR The reorder point formula tells you exactly when to place your next purchase order so inventory arrives before you stock out. The formula: (Average Daily Sales × Lead Time in Days) + Safety Stock. For most Amazon FBA sellers, the tricky part is getting accurate inputs, especially lead time, which needs to include FBA […]
Nine plain-English calculators built for Amazon FBA — safety stock, reorder points, stockout cost, FBA fees. Runs in your browser. Your numbers never leave the page.