FBA Storage Fee Calculator accuracy and testing

Formula source

• Base storage fee = average cubic feet x monthly storage rate x months. Aged inventory fee = aged cubic feet x aged fee rate. Total storage fee = base storage fee + aged inventory fee + surcharges + removal or disposal fees.

Test cases

Known limitations

• This page documents the checked-in calculator logic and does not certify results for every real-world edge case.
• Use the result as a planning estimate unless the calculator page states a stricter purpose.

Assumptions

• Average cubic feet is multiplied by the user-entered monthly rate and month count.
• Aged inventory fee is modeled as a per-cubic-foot charge against the aged portion of inventory.
• Surcharge and removal or disposal fees are editable fixed costs.
• The calculator does not use live marketplace storage prices.

Unit handling

• Average Cubic Feet accepts values in cu ft.
• Monthly Storage Rate accepts values in $/cu ft.
• Months Stored accepts values in mo.
• Aged Cubic Feet accepts values in cu ft.
• Aged Fee Rate accepts values in $/cu ft.
• Surcharge Fees accepts values in $.
• Removal / Disposal Fees accepts values in $.
• Total Storage Fee is displayed as currency.
• Base Storage Fee is displayed as currency.
• Aged Inventory Fee is displayed as currency.
• Effective Monthly Cost is displayed as currency.

Rounding rules

• Number displays use up to 2 decimal places in the calculator UI.
• Currency outputs are displayed with standard US dollar formatting.
• Input precision follows configured step values where provided.

Version history

Change log