What does this product actually cost to sell?
A supplier listing shows you a unit price. It does not show you freight per unit, duty, import VAT, payment fees, or the only number that decides whether you can advertise the thing at all — how much you can pay per sale before it stops making money. MurmMargin builds the cost the way customs charges it, and prints every assumption beside the figure.
The order matters. Duty is charged on goods plus freight; import VAT on the duty-inclusive amount. Getting that sequence wrong understates your cost — the one direction a margin tool must never err in, because it tells people a bad product is fine.
The headline figure
Type your sell price and the panel answers in the terms an ad buyer thinks in: you can pay this much per sale before the unit loses money. Margin tells you whether a product works in principle. Break-even CPA tells you whether you can afford to compete for it, which is the decision you are actually making.
Duty is a band, not a rate
The real rate depends on the tariff line a customs officer assigns, and no browser extension can classify goods. So MurmMargin applies the band for the category the listing itself declares, prints both edges, and says which category it matched from the page's own breadcrumb. A single confident percentage would be easier to read and impossible to check.
Small orders usually pay no duty at all
Consignments under €150 into the EU, £135 into the UK and $800 into the US clear without customs duty — and the threshold applies to the whole order, not the unit. A calculator that charges duty on a three-unit sample order is wrong about nearly every sourcing decision a new seller makes. VAT is separate, and still applies.
Ordering more can cost more
This is the least obvious thing in the calculation, and no supplier page will tell you. Crossing the de minimis applies duty to every unit at once, so one extra item can raise your per-unit cost by several percent. MurmMargin flags the largest quantity that still clears duty-free — but only when that smaller order genuinely lands cheaper, because fewer units also means the same freight spread over fewer of them. It checks both sides before advising anything. The full worked example is here.
What it refuses to tell you
- Whether it will sell. Not on the page, not computable, not pretended.
- A price from marketing text. Only the machine layer counts, so a banner shouting a teaser price that is not in the listing data is ignored.
- A comparison across currencies. Ranking suppliers priced in EUR against ones priced in USD needs an exchange rate, and a stale rate reorders a close call.
- Net profit. Returns, chargebacks and your time are not on the page. This stops at contribution margin, and names the stop.
It remembers what the listing cost last time
Come back in two weeks and it tells you the supplier quietly moved the price — recorded on your machine, compared on your machine, and never across a currency switch.
Free to use, Pro at €6.99/month or €54/year. Pro adds unlimited saved suppliers, comparison ranked by landed cost, all three destinations at once and CSV export.
Get MurmMargin for Chrome →→Questions
How do I work out the real landed cost of an AliExpress product?
Open the listing and click the icon. Freight is an input, because it is quoted per destination behind a widget and cannot be read from the page.
Do small orders pay customs duty?
Usually not — under €150 into the EU, £135 into the UK, $800 into the US, measured on the whole consignment. VAT still applies.
Can ordering more units cost more per unit?
Yes. Crossing the threshold applies duty to every unit at once. Worked example.
Is it free?
The whole answer is free. Pro adds saving, comparing and exporting.