FBA Storage Fee Calculator 2026: 181-Day Penalty Rates
Check FBA storage costs before 181-day surcharges hit your margins. Monthly and peak-season rates — free calculator included. Free calculator included.
What this tool helps you do
Check FBA storage costs before 181-day surcharges hit your margins. Monthly and peak-season rates — free calculator included.
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Frequently Asked Questions
How much will my FBA storage costs increase during peak season in December 2026?
FBA storage rates for standard-size items spike from $0.78 per cubic foot January through September to $2.40 per cubic foot during peak season (October through December)—a 208% increase. For example, a product occupying 0.1 cu ft costs $0.078/month off-peak but $0.24/month during peak, meaning 500 units would cost $39/month normally but $120/month in October through December. That difference adds $360 in storage fees for three months alone. Many sellers who misjudge Q4 inventory send-ins find their holiday profit margins completely erased by peak storage fees, which is why calculating per-unit monthly cost before sending in Q4 inventory is critical.
What is the 181-day FBA Aged Inventory Surcharge and how much will it cost me?
The Aged Inventory Surcharge penalizes slow-moving inventory stored at Amazon for 181 days or longer, triggering monthly fees starting at $0.50 per cubic foot for items aged 181-270 days. The surcharge increases to $1.00/cu ft for 271-365 days and $6.90/cu ft for anything over one year. A 0.1 cu ft item aged 181+ days pays $0.05/month indefinitely until sold. After 365+ days, that item pays $6.90 in surcharges per month alone—far exceeding typical reseller margins on slow-movers. Your strategy must track items approaching 120 days and force action via discounting, FBA removals, or Liquidations before penalties deepen.
How do I calculate the FBA storage cost per unit before sending inventory to Amazon?
To calculate FBA storage per unit, multiply your product's cubic foot volume by the rate—volume equals (L×W×H in inches) ÷ 1,728. A 10×6×4 inch packed item = 0.139 cu ft. At off-peak of $0.78/cu ft, that's $0.108/month storage per unit, or roughly $1.30 annually. Peak season's $2.40/cu ft raises it to $0.333/month. Knowing this math before sending inventory is crucial: if you send 500 units at 0.1 cu ft each, you'll pay $39/month off-peak but $120/month during Q4. Use this calculator to model expected storage costs for your specific dimensions and quantities before committing inventory to Amazon.
Should I use FBA or FBM for inventory that takes 3+ months to sell?
For slow-moving inventory with monthly turnover below 1-2 units, FBM (Fulfilled by Merchant) is almost always cheaper than FBA on a total-cost basis. FBA charges storage every month your item sits: at $0.78/cu ft, a 0.1 cu ft item costs $0.78/month or $2.34 for three months. After 181 days, the Aged Inventory Surcharge kicks in, adding another $1.50/unit/month indefinitely. FBM has zero storage fees since you hold inventory. The trade-off is losing Amazon Prime visibility, which reduces buyer conversion significantly. Calculate your storage exposure against the Prime benefit loss: if your 3-month FBA cost exceeds $3-5 per unit AND your item is slow, FBM wins the margin game even after the conversion rate drop.
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