Amazon contribution margin
Amazon contribution margin is the bridge between a sale and the advertising decision.
Revenue tells you what the customer paid. Contribution tells you how much economic room remains after variable costs—and therefore what advertising and growth can actually afford.
Economic truth per order
Start with the costs that move with the sale.
For decision support, CEILR separates pre-ad contribution from advertising so sellers can see the room available before choosing how much of it to spend on acquisition.
01Selling price
The top of the unit economics.
Selling price
The top of the unit economics.Use the actual seller price relevant to the decision. Do not substitute revenue growth for unit profitability.
02Landed product cost
Cost to have the unit ready to sell.
Landed product cost
Cost to have the unit ready to sell.Include the seller’s real landed economics rather than a generic category assumption.
03Amazon/per-order fees
Marketplace and fulfilment economics.
Amazon/per-order fees
Marketplace and fulfilment economics.Use current seller-specific fees where known. CEILR does not fabricate fees when they are missing.
04Other variable costs
Costs that scale with each order.
Other variable costs
Costs that scale with each order.Packaging, external fulfilment or other variable costs can reduce the contribution available to advertising.
05Pre-ad contribution
Price minus variable unit costs.
Pre-ad contribution
Price minus variable unit costs.This amount represents the maximum theoretical room before advertising and any protected contribution target.
06Post-ad contribution
What remains after acquisition cost.
Post-ad contribution
What remains after acquisition cost.Subtract advertising cost per order to see whether the sale still contributes economically after demand acquisition.
Contribution formulas
Use the same economic definitions across PPC and growth decisions.
Consistency prevents one dashboard from calling an action “profitable” while another uses a different denominator.
| Metric | Formula | Meaning |
|---|---|---|
| Pre-ad contribution | Price − landed cost − Amazon/per-order fees − other variable costs | Room before ads |
| Pre-ad margin | Pre-ad contribution ÷ price | Contribution rate before ads |
| Post-ad contribution | Pre-ad contribution − ad cost/order | Economic contribution after ads |
| Post-ad margin | Post-ad contribution ÷ price | Contribution rate after ads |
| Break-even ACoS | Pre-ad contribution ÷ price | Theoretical ad-sales ratio at zero post-ad contribution |
Contribution is not the same as accounting net profit. Fixed overhead, tax, returns, financing and other business-level costs may sit outside a simplified per-order decision model.
Related seller decisions
Use contribution as the foundation for PPC decisions.
Amazon profit margin calculatorCalculate pre- and post-ad contribution from your inputs.
Amazon PPC profitabilityTranslate contribution into an advertising ceiling.
Amazon profitability softwareConnect contribution to cash, inventory and evidence.
Amazon PPC and profit glossaryEvery term on this page, with its formula.
The decision system is designed to make the economic assumptions visible rather than hiding them behind a score.
Seller-controlled decision intelligence