PPC ACOS/ROAS Calculator
Calculate ACOS, ROAS and your break-even ad spend for Amazon PPC.
What is the PPC ACOS/ROAS Calculator?
ACOS (Advertising Cost of Sale) and ROAS (Return on Ad Spend) are the two core metrics for judging whether an Amazon PPC campaign is working. This calculator turns your ad spend and ad sales into both numbers instantly, plus tells you whether your current ACOS is above or below your break-even point.
The formulas
- ACOS = Ad Spend ÷ Ad Sales × 100. Lower is better — it's the percentage of ad-attributed revenue that went to advertising.
- ROAS = Ad Sales ÷ Ad Spend. Higher is better — it's how many dollars of sales you got back per dollar spent on ads.
- Break-even ACOS = your profit margin before advertising costs. If your ACOS is above this number, advertising is losing you money on that sale; below it, you're still profitable after ad spend.
How to use it
- Enter your ad spend and ad sales for the period you're analyzing (from your Amazon Advertising campaign report).
- Optionally enter your profit margin before advertising costs (from a profit calculation like the FBA Profit Calculator) to see your break-even ACOS and a profitable/unprofitable verdict.
Note that ACOS measures profitability of a single campaign or sale in isolation; it doesn't account for the "halo effect" of ads driving organic ranking improvements or repeat purchases, which many sellers factor in separately when deciding how aggressively to bid.