FBA vs FBM Cost Comparison

What is the FBA vs FBM Cost Comparison?

This tool compares your real per-unit profit between selling Fulfilled by Amazon (FBA), where Amazon stores, picks, packs and ships your product, and Fulfilled by Merchant (FBM), where you handle storage and shipping yourself — using your own numbers for both, side by side.

How to use it

1. Enter your product cost, selling price and referral fee (the referral fee applies the same way under both models).
2. Fill in your FBA fulfillment fee and an amortized storage cost estimate from Seller Central.
3. Fill in what it actually costs you to pack and ship one unit yourself for FBM — your real shipping rate, box/mailer cost, and any packing labor.

Neither model is universally better: FBA often wins on fulfillment cost for lightweight, fast-moving items and unlocks Prime eligibility, while FBM can win for large, heavy, or slow-moving items where Amazon's storage and fulfillment fees add up fast, or where you already have efficient shipping in place. This calculator doesn't guess your fees for you — it uses the real numbers you pull from Seller Central and your own shipping carrier, since those vary too much by product and account to hardcode responsibly.