Free Tool — Amazon US · Fee Rates Updated 2025

Amazon FBA Monthly Storage Fee Calculator

Enter your product dimensions, unit count, and storage month to see your exact monthly storage cost per unit — plus a full annual projection broken down by peak and off-peak season.

How does Amazon calculate FBA storage fees? Amazon charges monthly storage fees based on the cubic footage your inventory occupies in their fulfillment centers. The formula is: (volume per unit in cubic feet) × (number of units) × (rate per cubic foot). Volume is calculated from your product dimensions: L(in) × W(in) × H(in) ÷ 1,728. Rates vary by size tier (standard vs. oversize) and season (Jan–Sep vs. Oct–Dec).

Product
Inventory
Storage Month
Monthly Storage Fee
—
total for all units
Per Unit
—
Total Cubic Ft
—
Fee Breakdown
Volume per unit —
Units —
Total cubic feet —
Rate (Jan–Sep) —
= Monthly Fee —
Annual Projection (same units all year)
Jan–Sep (9 months) —
Oct–Dec (3 months, peak) —
Total annual —

Rates based on Amazon's 2025 FBA fee schedule. Always verify current rates in Seller Central.

Inventory sitting too long?  Calculate aged inventory surcharges →

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Frequently Asked Questions

How does Amazon calculate FBA storage fees?

Amazon charges monthly storage fees based on the cubic footage your inventory occupies in their fulfillment centers. The formula is: (volume per unit in cubic feet) × (number of units) × (rate per cubic foot). Volume is calculated from your product dimensions: L(in) × W(in) × H(in) ÷ 1,728. Rates vary by size tier (standard vs. oversize) and season (Jan–Sep vs. Oct–Dec).

Why are October–December storage fees so much higher?

Amazon's fulfillment centers are under extreme capacity pressure during Q4 (holiday season). To encourage sellers to move slow-moving inventory out before peak season, Amazon charges roughly 3× higher storage rates from October through December. Standard-size goes from $0.78/cubic foot to $2.40/cubic foot — make sure you plan your replenishment and removals around this window.

What is the difference between standard-size and oversize storage fees?

Standard-size products pay $0.78/cubic foot (Jan–Sep) and $2.40/cubic foot (Oct–Dec). Oversize/Large Bulky products pay lower rates: $0.56/cubic foot (Jan–Sep) and $1.40/cubic foot (Oct–Dec). Despite the lower rate per cubic foot, oversize products usually cost more in total because they occupy far more cubic footage per unit.

When are FBA storage fees charged?

Amazon charges monthly storage fees between the 7th and 15th of the following month. For example, January's storage fees are charged in mid-February. The fee is based on the daily average cubic footage your inventory occupied during the calendar month — not a snapshot on a single day.

How can I reduce my FBA storage fees?

The most effective strategies are: (1) improve sell-through rate so inventory turns faster; (2) remove or liquidate slow-moving units before the Oct–Dec high-season rate kicks in; (3) use FBM or 3PL for slow-moving products and only send fast-movers to FBA; (4) optimize product packaging to reduce dimensions and cubic footage. Also keep an eye on aged inventory surcharges — items stored 271+ days incur additional fees on top of monthly storage.