Free tools for marketplace sellers
Four calculators, free, with no sign-up and no email wall. They are the same ones we use in a seller audit, so if the numbers they give you look wrong, that is usually worth a conversation.
The calculators
| Tool | What it answers | Use it when |
|---|---|---|
| Amazon FBA calculator | What an Amazon sale actually leaves you after referral fees, FBA fulfilment and your landed cost. | Before you set a price, and before you decide whether an SKU belongs in FBA at all. |
| Amazon PPC audit calculator | Scores your current ACoS, TACoS and CTR and names what to fix before you raise budgets. | When ad spend is rising and you are not sure the revenue is following. |
| Blinkit commission calculator | What Blinkit's commission and charges take off a quick-commerce order, and what is left. | Before listing on Blinkit, quick-commerce margins are thinner than sellers expect. |
| Ecommerce profitability calculator | Contribution margin across your whole operation, not one channel: product cost, fees, shipping, returns and ad spend together. | When you sell in more than one place and no single dashboard shows the real picture. |
Why these four
They cover the three decisions that sink most marketplace sellers, in the order the decisions arrive:
- Is this SKU profitable here at all? The FBA and Blinkit calculators answer it per platform, because the same product can work on one marketplace and lose money on another.
- Am I buying revenue at a loss? The PPC audit calculator is the quickest way to see whether your target ACoS sits above or below your break-even point, the distinction explained on our Amazon PPC management page.
- Does any of it add up across channels? The profitability calculator, because channel-level margins can each look acceptable while the business does not.
What a calculator cannot tell you
Worth being straight about. These work from the fees and costs you type in, so they are exactly as accurate as your inputs. They will not tell you whether a category is already saturated, whether your listing converts, whether your reviews can compete, or whether your stock will arrive in time for the sale you are pricing for. They also use published fee structures, which marketplaces change, read your own settlement report for the figures that actually applied to your orders.
They are a sanity check before you commit money, not a substitute for looking at the account.
If the numbers look wrong
That is usually the useful outcome. A free account audit goes through the live account rather than the assumptions: account health, listing quality, ad waste, inventory position and anything the marketplace owes you that nobody has claimed. You get the findings either way.
We manage 600+ seller accounts across 14 marketplaces, see marketplace management for what that covers, pricing for what it costs, or case studies for what it has done for sellers in the same position.