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Amazon FBA storage fee calculator

Estimate monthly + long-term storage costs before sending inventory to Amazon. Includes standard, oversized, and danger-zone (LTSF) calculations.

Standard-size = fits within 18×14×8 inches and under 20 lbs. Oversize otherwise.
Typical small item: 0.05. Mid: 0.20. Large: 0.50+. Find on Amazon listing under "Product dimensions".

Tips to reduce Amazon storage fees

  • Watch the 180-day mark: Inventory stored over 180 days incurs Long-Term Storage Fee (LTSF) at $6.90/cubic foot or $0.15/unit (whichever is greater). Remove or discount before day 180.
  • Inventory Performance Index (IPI): Keep your IPI score above 400 to avoid storage limits. Below 400 = restricted storage.
  • Peak season (Oct-Dec) rates are 3x higher. Send inventory in September, not November.
  • Use a 3PL warehouse for slow movers. Storage at Think14 is $0.20/unit/month flat, no LTSF. Replenish to Amazon as you sell.
  • Bundle small items. Bundling 3 small items reduces total cubic feet stored at Amazon.
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