Method
Contribution equals selling price minus per-unit costs and the entered percentage fee. Net contribution then subtracts any fixed setup cost once.
Assumptions and limits
Enter a single currency and your own fulfillment quote. This tool does not predict take rate, fees, tax, or shipping.
Related tools
Test the add-on by itself
Selling price less product, packaging, pick/pack, shipping subsidy, other variable cost, and the entered percentage fee is the per-unit contribution. Fixed setup is subtracted once from the expected total; it is not a cost on every add-on.
Use the result in a design decision
A $20 accessory may appear attractive until handling and subsidy are included. Change expected units to see whether setup can be recovered, and keep the core pledge???costs out of this model unless the add-on genuinely creates them.