← Amazon FBA vs FBM calculator
This calculator vs. tracking it in a spreadsheet
An FBA seller working more than one same-SKU decision -- FBA or FBM, a coupon, Subscribe & Save, a supplier MOQ, prep, inbound placement, Individual or Professional -- usually ends up with a spreadsheet: a row for the category referral rate, one for the size-tier fulfillment fee, a tab for the coupon math copied from the FBA-vs-FBM tab and edited by hand. This page is about what changes when those twenty comparisons stay wired to one listing instead of living in twenty cells someone has to remember to update together.
What each approach actually does
A spreadsheet can reproduce every formula this calculator runs. FBA versus FBM is a referral rate, a fulfillment fee, and a storage line against a shipping label. A coupon is the referral rate applied to a lower price, minus a redemption fee. A supplier MOQ is a lower unit cost against a longer warehouse stay. None of that needs anything a spreadsheet cannot do. Building it means pulling each rate from a different part of Seller Central or Amazon's help pages -- the category referral table, the size-tier fulfillment schedule, the placement-fee band, the current storage rate for the season -- typing each into the right cell, and adding a new tab the next time the listing needs a decision the sheet does not already have a row for.
This calculator keeps all twenty of those comparisons on one listing, already wired to the same sale price, cost of goods, and size tier, so changing the sale price updates the FBA-vs-FBM profit, the coupon lift needed, the MOQ break-even, and the rest at once instead of in whichever tabs got remembered. A shareable link carries the whole scenario in the URL, and named sourcing scenarios stay in your own browser so you can switch between two suppliers or two price points without retyping eighty fields.
The gap is not that the arithmetic differs. On this calculator's own shipped listing -- a $29.99 large-standard item, $8 cost of goods, 80 units a month, and the illustrative defaults -- FBA nets $10.99 and FBM nets $11.64: a $0.65 gap that a spreadsheet reproduces correctly only if someone remembered to point its FBM tab at the same sale price and cost-of-goods cells as its FBA tab, and re-checks that link every time either number changes.
| Question | Where to answer it |
|---|---|
| Does FBA or FBM leave more on this exact listing? | Either approach can compute it -- this calculator keeps it wired to the same inputs as the other nineteen decisions below. |
| My situation has a wrinkle this tool doesn't model (a multi-ASIN bundle, a rebate deal). | A spreadsheet you build yourself -- it can represent any rule you can describe. |
| Does a coupon, S&S enrollment, or a supplier MOQ still pay on the same SKU I just priced? | This calculator's linked follow-on pages -- see what this checks. |
| I changed the sale price -- did every other comparison update? | This calculator, automatically. A spreadsheet only if every tab's formula actually points back at that one cell. |
| Is my data uploaded anywhere? | No, for either approach -- a spreadsheet file stays wherever you saved it, and this calculator runs entirely in your browser. |
A spreadsheet is not a worse tool so much as a shortcut whose upkeep cost is easy to underweight until a tab goes stale after a rate changes. This calculator does not remove that flexibility -- your own sheet can still model anything this one's fixed fields cannot -- it just keeps the twenty decisions most FBA sellers actually repeat wired to one listing instead of twenty cells.
This tool needs no account and no sign-in: it is a static page, the arithmetic runs in your browser, and once it has loaded it keeps working with the connection off.
Common questions
Can a spreadsheet do this math instead?
Yes. Every comparison this calculator runs -- FBA versus FBM, a coupon against list price, Subscribe & Save against list, a supplier MOQ against your usual order, Amazon prep against you-prep, inbound placement against split freight, Individual against Professional, Low-Price FBA against a real raise, aged inventory against a removal, AWD against send-all-to-FBA, Remote Fulfillment against skipping Canada, and Seller Fulfilled Prime against FBA -- is ordinary arithmetic you can put in a spreadsheet. Getting there means pulling your category's referral rate, your size tier's fulfillment fee, the season's storage rate, and the placement, prep, and account-fee schedules from separate parts of Seller Central or Amazon's help pages, then typing each into the right cell.
What does a spreadsheet not do that this calculator does?
Keep all twenty of those comparisons wired to the same listing so changing one number -- the sale price, the cost of goods, the return rate -- updates every comparison built on it at once. A sheet built for the FBA-vs-FBM decision rarely already has a tab for a coupon, a MOQ, or a Remote Fulfillment surcharge on the same SKU, so each new decision usually means a new tab copied from an old one, with its own chance of a stale formula or a rate that was never updated after the last one changed. This calculator also produces a shareable link that carries the whole listing after the # in the URL, and named scenarios kept in your own browser, neither of which a spreadsheet file does without emailing it around.
Is a spreadsheet ever the better choice?
Yes, when your situation has a shape this calculator's inputs cannot represent -- a bundle of several ASINs in one shipment, a private-label deal with a rebate structure, or a fee schedule from a program this tool does not model. A spreadsheet you build yourself can represent any rule you can describe. This calculator trades that flexibility for a form that already has the right fields for one listing moving through the fulfillment, pricing, and inbound decisions most FBA sellers actually face.
Is my data uploaded anywhere?
No. The calculator runs entirely in your browser. A shareable link carries your numbers in the URL itself rather than sending them to a server, named sourcing scenarios stay in your own browser's storage, and the optional usage counter records only which features were used and the day -- never your prices, costs, or ASIN.
This page names no specific product -- it compares against the generic method of tracking these decisions in a spreadsheet, not a competing calculator or service. Open the Amazon FBA vs FBM calculator, or see FBA vs FBM: which path leaves more? for a worked example.