Amazon Tool 2026

Amazon Aged Inventory Calculator 2026

Compare the cost of removing inventory now vs. paying the aged inventory surcharge. Find your break-even point.

Units in FBA

Days in FBA currently

Expected monthly sellthrough (units)

Size tier

2026 aged inventory surcharge reference

Day 1–180: $0 surcharge

Day 181–364 (12 months): Surcharge applies (verify rate in Seller Central)

Day 365–455 (12–15 months): $0.30/unit OR $6.90/cu ft (whichever greater)

Day 455+ (15+ months): $0.35/unit OR $7.90/cu ft (NEW 2026 tier)

Threshold moved from day 271 to day 181 in 2026

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