Maximum Sourcing Cost Calculator
Maximum landed cost is the most you can pay to put one saleable unit into an Amazon fulfillment center and still hit the net margin you are targeting at your intended price. It is the profit equation run backward: start with the price, subtract the profit you insist on keeping, then subtract the referral fee, the FBA fulfillment fee, storage, advertising, and any other per-unit cost. Whatever remains is your ceiling, and it is the single number to walk into a supplier negotiation holding. Enter your own numbers below; the fields load with a worked example already filled in.
Calculate your cost ceiling
How the maximum sourcing cost calculation works
Every other profit calculation starts with a known cost and solves for profit. This one fixes the profit and solves for the cost, which is the order sourcing decisions are actually made in:
- Referral fee = target selling price × referral rate. Because the fee is a percentage, it is set the moment you choose a price and has nothing to do with what you pay a supplier.
- Target profit per unit = target selling price × target net margin. This is the money you are refusing to spend, ring-fenced before anything else is subtracted.
- Maximum landed cost = selling price − target profit − referral fee − FBA fulfillment fee − storage − advertising − other costs. Everything left over after the fees and the profit you demanded is what the product itself is allowed to cost.
- Implied return on investment = target profit ÷ maximum landed cost. This restates the same deal in cash-efficiency terms, which matters more than margin when your constraint is working capital rather than shelf space.
- Break-even landed cost = selling price − referral fee − FBA fulfillment fee − storage − advertising − other costs. This is the same subtraction with the target profit set to zero, so it marks the absolute wall rather than the planning ceiling.
The distance between those two figures is the negotiating room. The maximum landed cost is the number you plan against; the break-even landed cost is where the SKU stops making money entirely. A quote that sits between them is not a disaster, but it is a product that will only work if you can raise the price, cut the advertising dependency, or move to a lighter size tier.
The word landed is the part that most often goes wrong. A supplier quoting ex-works is quoting the price of goods sitting on their loading dock, and that figure can be less than half the true cost per unit by the time freight, duty, brokerage, drayage, and prep are added. Two quotes are only comparable when both have been converted to the same landed basis, so build each one up on the landed cost calculator before you compare them against the ceiling on this page. Suppliers know that ex-works numbers look better in an email, and a quote that leaves the incoterm unstated should be treated as incomplete rather than cheap.
Two inputs deserve pressure-testing before you rely on the output. Advertising per unit at launch is usually far higher than the steady-state figure you eventually settle on, so run the calculator twice, once at launch spend and once at maturity, and decide which world the purchase order has to survive. Storage per unit depends on how fast the SKU turns and rises steeply in the October to December peak window, so a slow mover carries several months of storage rather than one. Sourcing decisions committed at optimistic assumptions on both lines are the most common reason a product that penciled out on paper never earns anything in practice. For international sourcing, tariff and duty movement can shift the landed basis after the order is placed, which is covered in the international selling briefings.
Worked example: a $24.99 kitchen SKU
These are the values the calculator loads with, so you can see the method and the widget agree. Figures are illustrative.
- Target selling price $24.99, referral rate 15%, FBA fulfillment fee $6.10, storage $0.12 per unit, advertising $2.90 per unit, other costs $0.00, target net margin 15%.
- Referral fee: $24.99 × 0.15 = $3.75. Target profit: $24.99 × 0.15 = $3.75.
- Maximum landed cost: $24.99 − $3.75 − $3.75 − $6.10 − $0.12 − $2.90 − $0.00 = $8.37 per unit.
- Implied return on investment: $3.75 ÷ $8.37 = 44.8%.
- Break-even landed cost: $24.99 − $3.75 − $6.10 − $0.12 − $2.90 = $12.12 per unit.
Read that as a negotiating brief: any landed quote at or below $8.37 clears the 15% target, anything between $8.37 and $12.12 makes some money but misses it, and anything above $12.12 loses money on every sale. If the best all-in quote lands at $9.50, the conversation to have is about price, packaging size, or order quantity, not about squeezing the supplier for another $0.08.
Frequently asked questions
What counts as landed cost when comparing supplier quotes?
Landed cost is everything you pay to get one saleable unit into an Amazon fulfillment center: the supplier unit price, inland freight to the port, ocean or air freight, insurance, customs duty and tariffs, customs brokerage, drayage, and any prep, polybagging, or labeling. A quote that omits half of that list is not comparable to one that includes it.
Why calculate a maximum cost instead of just asking for the best price?
Because a supplier price only means something against a ceiling. Knowing the number in advance turns a negotiation into a yes or no question rather than a guess, tells you exactly how much a tooling charge or a minimum order quantity is worth, and stops you from talking yourself into a deal that was never going to clear your margin target.
What is a realistic target net margin to enter?
Most established private-label sellers plan around 8-15% net margin after every fee and advertising cost. Entering a higher target is fine as a screening filter, and many sellers deliberately set 20% or more when sourcing so there is room to absorb a fee increase or a price war later without the SKU going underwater.
Should the advertising figure include organic sales?
Yes. Enter blended advertising cost per unit sold, which is total ad spend divided by total units sold rather than only ad-attributed units. Organic orders are subsidized by the spend that bought the rank, so allocating ad cost only to attributed orders makes the ceiling look higher than it is and leads to overpaying a supplier.
What if the calculator returns a maximum cost of zero or less?
It means the price, the fee stack, and the target margin cannot all be true at once, before any money reaches the supplier. The fixes are structural: raise the price, cut the fulfillment fee through packaging or size tier changes, reduce advertising dependence, or accept a lower margin. No sourcing negotiation can close that gap.
Sources
- Amazon Seller Central: referral fee schedule, FBA fulfillment fees, and monthly storage rates (primary source for your exact per-ASIN fees).
- Seller Signal analysis. All example figures above are illustrative planning values, not current published rates.