Amazon Seller Studio
The all-in-one hub for Amazon FBA sellers — net profit, break-even ROAS, and a live comparison against every other platform you might be listing on, without switching tabs between three separate tools.
Amazon FBA Fee & Profit Calculator
Calculate your true net profit on Amazon FBA — referral fee, fulfillment fee, shipping to Amazon, and product cost — the real math behind the gap between what a calculator promises and what actually lands in your payout.
Marketplace Fee Matrix
Compare your Amazon FBA net profit side by side against Etsy, eBay, Poshmark, and Shopify for the same product.
Break-even ROAS Calculator
Find the minimum return on ad spend (ROAS) at which a campaign covers its own cost — zero profit, zero loss on the ad spend itself — based on your profit margin. This is the floor to know before setting a target ROAS, not the target itself.
Why Amazon sellers need more than the official FBA calculator
The single most-cited complaint in Amazon seller communities is a gap between promise and payout: “the FBA fee calculator says you'll net $8-10... then actual payouts hit and you're clearing $5, sometimes less.” That gap usually comes from calculators that quietly drop line items — a 2026 review found budget tools calculate only three or four of the seven-plus real FBA fee categories, and even Amazon's own official calculator doesn't include VAT, overstating profit for sellers who owe it. Q4 storage is the single biggest surprise: standard-size storage triples from $0.78/cu ft (Jan-Sep) to $2.40/cu ft (Oct-Dec), and for 2026 sellers reported paying “8-10% more, not 0.5%” once stacked fulfillment increases, an April fuel surcharge, and restructured placement fees were all accounted for.
What this hub covers
The Amazon FBA calculator above breaks out referral fee (by category, since it ranges from 8% to 45% depending on what you sell), fulfillment fee, and monthly storage as three separate, visible line items instead of collapsing them into one number. Break-even ROAStells you the minimum return on ad spend a Sponsored Products campaign needs to hit before it's actually adding to your bottom line, based on your real margin after those fees. The Marketplace Fee Matrix runs the same product through Amazon FBA, Etsy, eBay, Poshmark, and Shopify at once, so you can see whether Amazon is even the most profitable place to sell it before committing inventory.
Who this is for
For active and prospective Amazon FBA sellers who want a real answer on net profit per unit — including the fees that don't show up on the headline referral-fee percentage — and who want to check that answer against other platforms before deciding where to list or expand.