Know your real margin before you list
A $30 product can easily lose money once you stack a 6.5% transaction fee, 3% + 25¢ payment processing, a listing fee, shipping, a 15% offsite-ad fee and a 5% return rate. Our calculators lay every cost out line by line, so you can set prices that protect profit instead of discovering the gap at month-end.
Fee schedules we keep up to date
Marketplace fees change several times a year. Each calculator shows the default rates we use and when they were last reviewed, and every rate is editable — so if your category, plan or region differs, simply overwrite the number.
Growth metrics every seller should track
- Break-even ROAS = 1 ÷ contribution margin. Below it, ads lose money.
- Target CPA = profit per order you are willing to spend to acquire a customer.
- Unit economics = revenue minus all variable costs per order.
Frequently asked questions
Are the marketplace fees accurate?
Defaults reflect each platform's published standard rates as of our last review (shown on each page). Rates vary by category and region, so every field is editable.
Do you store my numbers?
No. Calculations happen in your browser and are not saved or sent anywhere.