Ad Spend / ROAS Calculator

Estimate maximum ad spend, required ROAS, and post-ad profitability for marketplace listings.

Ad spend inputs
Choose a marketplace preset or enter your own fee mix, then calculate how much you can spend to acquire a sale while protecting your target profit.
Ad spend result
See the allowable ad spend threshold first, then compare it against your current ad spend scenario.
Run the calculator to see your allowable ad spend and required ROAS.
Example ad-spend analysis
Scenario
Analyze a listing sold for 100 with product cost 40, shipping 10, total platform fees of 15%, target profit 10, and actual ad spend of 15.
Inputs
  • Selling price = 100
  • Product cost = 40
  • Shipping = 10
  • Marketplace fee = 10%
  • Payment fee = 3%
  • Marketplace ads fee = 2%
  • Target profit = 10
  • Actual ad spend = 15
Expected Result
Profit before ad spend: $ 35.00 | Max ad spend: $ 25.00 | Required ROAS: 4.00x | Profit after ad spend: $ 20.00
How this calculator helps

This tool helps sellers translate listing economics into a clear ad-spend ceiling and ROAS threshold before they scale campaigns.

  • Separates marketplace-side ads fees from external ad spend per sale.
  • Shows the maximum ad spend that still preserves your target profit.
  • Calculates required ROAS and checks whether your current spend is still safe.
Ad spend FAQ