Free tools
Free tools for online arbitrage sellers
You open the supplier's price list and half of it looks too expensive to sell. Twelve tabs later there is still no decision. These are the small, exact answers that come up while you work through a list like that — each one runs entirely in your browser, so the numbers you type never leave the machine you typed them on.
- Free
- No sign-up
- No email
- Nothing leaves your browser
Free Amazon FBA tools, one question each
Each one starts from something you were already trying to work out. Pick the question, not the tool.
- LiveThe supplier wants $12.50 and the listing sells at $29.99. Where does the other $17.49 go?
Amazon FBA & FBM revenue calculator
Profit, ROI, margin, break-even price and the most you can pay per unit — both fulfilment lanes side by side, with the FBM label priced from a published USPS Ground Advantage table instead of typed in from memory, and dated on the page so you know how far behind it runs.What it usesThe numbers you type. Amazon's referral and FBA fees are input fields showing their default, not a silent 15% — and every figure is worked out in your browser, so nothing is sent anywhere. - LiveAmazon says you are not approved to sell it. Is that paperwork, or is it a wall?
The seven Amazon restriction types
Seven kinds of gate and three ways they open. Which gates exist, anyone can explain; which one applies to you, only your connected account knows.What it usesThe restriction message you paste, matched word by word against the taxonomy compiled into this page. It runs in your browser, nothing is sent anywhere, and no account is read — the page cannot see your Amazon account, only the text you give it. - LiveA code from the supplier file matches nothing on Amazon. Is it a bad code, or did the spreadsheet eat a digit?
UPC & EAN check digit calculator
Paste a barcode: it tells you whether the last digit checks out, completes it if it is missing, and spots the leading zero your spreadsheet ate.What it usesThe digits you type — nothing else. No catalogue lookup, no ASIN match: the arithmetic runs in your browser and nothing is sent anywhere.
Where a free tool stops
Every tool here answers a question that arithmetic or a reference table can answer. None of them can see your Amazon account, and none of them can see the market. That is not modesty: it is the line where an answer starts costing money every time somebody asks for it, and it is the same line for every free tool for online arbitrage, ours included.
- Amazon FBA & FBM revenue calculator
- It prices one unit with the fees you type into it. It cannot read the fee Amazon actually charges your account for that ASIN, and it has no idea whether $29.99 is the price the listing is winning today.
- The seven Amazon restriction types
- It explains the seven gates and which of them ever open. It cannot tell you which one is on you: Amazon answers that per account, per ASIN and per condition, and it answers it to the account — there is no public table to look it up in.
- UPC & EAN check digit calculator
- It fixes the number. It cannot tell you which ASIN that barcode belongs to — turning a code into a catalogue entry is a paid lookup, not arithmetic.
Two more pages worth having open
Amazon wholesale suppliers, and how to read their price list
The long version of everything the tools assume you already know: where supplier lists come from, why brand permission decides the deal before price does, and what to do when the whole catalogue looks more expensive than the Amazon price. Every verifiable claim in it is quoted, linked and dated.
What the numbers on a supplier row mean
ROI, margin, Buy Box, velocity — defined the way this engine defines them, with the formula where there is one. Worth having open the first time a calculator hands you two percentages and you are not sure which one you are supposed to care about.
Questions about the free tools
- Are these Amazon seller tools actually free?
Yes. No account, no email field, no trial clock, no card. Nothing on these pages is a preview of a paid version of itself.
They are free because they cost us nothing to run: each one is arithmetic or a reference table compiled into the page, so serving it to a thousand people costs exactly what serving it to nobody costs. That is the whole business case — and it is also the honest limit, because the questions that do cost money per answer are not on this page.
- Does anything I type get sent to your servers?
No. There is no network request behind any of these tools — not to us, not to Amazon, not to a data provider. The page is delivered once and then does its work on your machine, which is why none of them asks who you are.
You do not have to take that on trust. Open your browser's developer tools, switch to the network tab, and type into any of them: nothing goes out.
- Why is there no free ASIN or UPC lookup here, when other online arbitrage tools have one?
Because a lookup is not arithmetic. Turning a barcode into an ASIN, or an ASIN into a sales rank, means a call to Amazon's catalogue or to a data provider, billed per request. It costs money every single time somebody uses it, including the times nobody buys anything.
A page that gives that away either caps it somewhere you will hit in the first minute, pays for it with your data, or is quietly hoping you do not come back. We would rather say plainly which questions are free and which ones cost money, and keep the second kind behind an account where they can be paid for.
- Can a free tool tell me whether I am gated on a brand?
No, and treat anything that claims otherwise carefully. Amazon answers that question per account, per ASIN and per condition, and it answers it to the account that asks. There is no public list to look yourself up in.
What a free page can do is set out the seven kinds of restriction, which ones ever open and what each one wants from you. That part is the same for everybody, and it is what the restriction page on this site covers.
- Which one should I open first?
If you have a supplier price list in front of you, start with the revenue calculator, on the two or three lines that look best. Its most useful number is not the profit: it is the most you can pay per unit and still hit the return you want. That is the figure you take back to the supplier.
Open the restriction page when Amazon answers you with a wall of policy text and you need to know whether it is paperwork or a dead end. Open the barcode tool when a code from the file matches nothing and you suspect the spreadsheet ate a leading zero.
One row is arithmetic. The price list is the job.
FlipIQ Batch is the other side of that line. It connects to your Amazon account read-only through Amazon's official OAuth, so a restriction check is answered for your account instead of in general, and the FBA and FBM fees come from the API rather than from a field with a default in it. It reads the supplier file as it arrived — Excel, CSV, or the 300-page distributor PDF — and hands back the rows worth buying. 5,000 rows a month free, no card.
Analyse a supplier list freeOr see how it works, the three places to ask the engine and what it costs.