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Cahoot Cost Tool

Seller Fulfilled Prime vs. FBA Cost Calculator

Compare the estimated cost to fulfill one packaged unit through Seller Fulfilled Prime versus FBA.

Enter your packaged product dimensions, FBA fulfillment fee, and a realistic Zone 3 ground shipping rate. We’ll compare the core cost of fulfilling one unit through FBA versus Seller Fulfilled Prime. For this quick comparison, assume the unit occupies storage for one month.

This is intentionally simple — not a full network, inventory, or profitability model. It takes about a minute.

1Your Packaged Product

Enter the dimensions and weight of one unit when fully packaged and ready to ship.

in

Enter a length greater than 0.

in

Enter a width greater than 0.

in

Enter a height greater than 0.

lb

Enter a weight greater than 0.

Is this product classified as dangerous goods / hazmat by Amazon FBA?

Amazon applies different base storage rates to products classified as dangerous goods. If you’re unsure, use the classification shown for your ASIN in Seller Central.

Select Yes or No.

Packaged volume
—
cu. ft.
FBA storage size Amazon determines product size tiers using packaged dimensions and weight. This calculator uses the Standard Size limits to select the appropriate base monthly storage rate.
—
Enter dimensions and weight
2Fulfillment by Amazon
$

Enter your FBA fulfillment fee (0 or greater).

Don’t know your FBA fulfillment fee?

Use Amazon’s Revenue Calculator to find the FBA fulfillment fee for this SKU, then enter it here.

Look it up on Amazon (opens in a new tab)
FBA base storage rate
—
Set by size, hazmat status, and period
1 month FBA storage
—
Packaged cu. ft. × rate × 1 month
3Seller Fulfilled Prime
$

Prefilled with a typical Cahoot pick-and-pack input. Replace it with your actual fulfillment rate if known.

Enter 0 or greater.

$/cu ft/mo

Prefilled storage assumption. Replace it with your actual storage rate if different.

Enter 0 or greater.

Packaging

Choose “No additional packaging needed” if the product ships in its own container or your packaging cost is already included elsewhere.

$

Enter 0 or greater.

Select UPS Ground Residential or FedEx Home Delivery.

$

Enter the total Zone 3 shipping cost for one packaged unit using the dimensions and weight above. For Seller Fulfilled Prime ground shipments, use a realistic UPS Ground Residential or FedEx Home Delivery rate that can actually be selected for the SFP order. Do not substitute USPS or discounted economy-service pricing simply because it is cheaper — those services are generally not the realistic selectable ground option for SFP orders.

Enter your Zone 3 ground shipping cost (0 or greater).

Not sure how to get a Zone 3 rate?
47905
Lafayette, IN · from
45405
Dayton, OH · to

Use this example shipment when requesting a quote from UPS or FedEx. Quote the same packaged dimensions and weight you entered above, using UPS Ground Residential or FedEx Home Delivery, and enter the resulting shipping cost here. This calculator does not fetch carrier rates and is not connected to UPS or FedEx rating systems.

Your One-Unit Cost Comparison

Comparison not complete yet

Add the remaining inputs and the one-unit comparison will appear here instantly.

    FBA storage estimate uses Amazon’s base monthly storage rate for one packaged unit stored for one month.

    Additional Amazon storage charges may apply. Amazon may assess a storage utilization surcharge on qualifying non-dangerous-goods inventory when the seller’s storage utilization ratio exceeds applicable thresholds. Aged inventory surcharges may also apply to inventory stored for 181 days or longer. These additional charges are not included in this quick comparison.

    What’s not included?

    This quick calculator intentionally excludes costs and operational factors that require a more complete SKU and network analysis.

    • FBA inbound placement fees
    • Transportation into Amazon
    • Distributed SFP inventory
    • Inventory positioning freight
    • Safety stock
    • Replenishment
    • Multiple fulfillment locations
    • Carrier contingencies
    • Returns
    • Storage utilization surcharges
    • Aged inventory surcharges
    • Other Amazon fees
    • Other warehouse / 3PL charges

    FBA base storage-rate assumptions are based on Amazon’s published US monthly inventory storage rates (opens in a new tab). Amazon fees change periodically; verify current account-specific fees before making a fulfillment decision.

    Beyond per-unit cost

    The Cost Comparison Is Only Part Of The SFP Story

    Seller Fulfilled Prime can provide operational benefits beyond the per-unit cost shown above.

    Keep control of your inventory

    Your inventory stays in your fulfillment network instead of being locked inside FBA. That can give you more control over where inventory sits, how it moves, and how quickly you can react.

    Reduce your dependence on FBA operations

    FBA receiving times, inventory deadlines, capacity restrictions, and operational policies can change. SFP gives merchants another way to keep Prime-eligible inventory moving without relying entirely on FBA.

    Own more of the fulfillment experience

    With SFP, merchants have more direct control over fulfillment execution, packaging, inventory availability, and operational troubleshooting instead of handing the entire process to FBA.

    Use one network across channels

    The same distributed inventory can support Amazon, Shopify, Walmart, B2B, and other channels instead of maintaining a separate pool of inventory only for FBA.

    Turn fast fulfillment into an omnichannel asset

    A fulfillment network built for Prime-speed delivery can also help offer faster delivery promises on your DTC and marketplace orders — where faster delivery may support conversion and customer experience.

    Don’t put your entire fulfillment strategy in one box

    SFP can reduce dependence on a single fulfillment program by giving merchants another Prime-capable fulfillment path while supporting the rest of their ecommerce operation.

    These benefits do not automatically make SFP the right choice for every SKU. The question is whether the operational and strategic value justifies the cost difference for your business.

    Next step

    Need the full SFP cost picture?

    This quick calculator compares one unit. Cahoot can help model the parts it doesn’t capture — including distributed inventory, fulfillment locations, inbound freight, replenishment, carrier strategy, and your actual SKU mix.

    Get a custom SFP cost analysis

    How much does Seller Fulfilled Prime really cost?