FBAZone — Amazon seller tools

Aged Inventory Cost Estimator

Amazon's aged-inventory surcharge for units sitting past 181 days, by age band.

Inventory
Product

L × W × H in inches ÷ 1728.

$
$
Units by age

Surcharge 0.5/cu ft per month

Surcharge 1/cu ft per month

Surcharge 1.5/cu ft per month

Surcharge 3.45/cu ft per month

Surcharge 4.1/cu ft per month

Surcharge 5.45/cu ft per month

Surcharge 6.9/cu ft per month (min 0.15/unit)

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Fill in the inputs and press Calculate. Results, a verdict and the formula trail appear here.

How the Aged Inventory Cost Estimator works

Beyond 181 days Amazon adds an aged-inventory surcharge on top of monthly storage, rising steeply with age. This estimator shows the monthly hit and how quickly it consumes the stock's value.

Formula

  • Surcharge per unit = max(Cubic feet × tier rate, per-unit minimum)
  • Monthly surcharge = Σ tier units × surcharge per unit

Example

Roughly $43 a month in surcharges on 180 aged units.

Cubic feet per unit: 0.1Landed cost per unit: 6Base monthly storage per unit: 0.08Units aged 181–210 days: 100Units aged 271–300 days: 50Units aged 365+ days: 30

Frequently asked questions

Are the tier rates current?

Defaults follow Amazon's published schedule; adjust the per-band inputs in the table if it changes.