Advertising Cost of Salesis the percentage of ad-attributed revenue spent on ads. It's your primary signal for PPC profitability on Amazon.
Input the total amount you spent on Amazon PPC campaigns for the period you want to analyse (day, week, month).
Add the total revenue attributed to those ads. Find this in your Amazon Seller Central reports under Campaign Manager.
Instantly see your ACoS percentage, a performance rating, and a personalised tip to improve your campaigns.
Cut wasted spend by adding irrelevant search terms as negatives. This alone can reduce ACoS by 15–30% within weeks.
Adjust bids for top-of-search, rest-of-search, and product pages separately. Top-of-search often converts 2–3× better.
Run Exact, Phrase and Broad in separate campaigns. Broad finds new terms; Exact captures intent. Separate budgets = cleaner data.
A higher click-through rate lowers your effective CPC. Improve your main image, title, and price to drive more organic clicks alongside ads.
Run dayparting reports to identify peak conversion hours. Pause or reduce bids during low-converting hours to stretch your budget further.
Identify your top 20% of keywords that generate 80% of revenue. Increase their budgets and reduce or pause everything else.
ACoS is the core profitability metric for Amazon PPC. Unlike ROAS — which shows a multiplier — ACoS frames performance as a percentage, making it easy to compare against your net margin.
Break-even ACoS is the point where ad spend exactly equals ad profit. If your net margin is 30%, your break-even ACoS is 30%. Any ACoS below that means your ads are profitable.