Amazon ACOS Calculator & PPC Report Analyzer

What ACOS actually measures

ACOS (Advertising Cost of Sale) is the single most-quoted number in Amazon PPC, and it's simpler than it looks: ACOS = Ad Spend ÷ Ad Sales. If you spent $300 on a campaign and it drove $1,000 in attributed sales, your ACOS is 30%. It answers one narrow question — "for every dollar of sales this campaign generated, how many cents went to ads?" — and nothing more. It doesn't know your product cost, your fees, or your margin, which is why a "good" ACOS is different for every seller.

ROAS is the same relationship, flipped

ROAS (Return on Ad Spend) is just the reciprocal: ROAS = Ad Sales ÷ Ad Spend. A 30% ACOS is exactly a 3.33x ROAS — same campaign, same dollars, just read the other way round. Amazon's own console leans on ACOS; broader marketing and DTC circles tend to talk in ROAS. Neither is more "correct," so the calculator above shows both, so you're never stuck converting one to the other by hand mid-review.

Break-even ACOS: the number that actually matters

ACOS on its own can't tell you whether a campaign is profitable — for that you need to compare it against your break-even ACOS, which is approximately equal to your profit margin before advertising costs. If a product has a 25% margin before ad spend, then a campaign running at exactly 25% ACOS is roughly break-even: the ad spend has eaten the entire margin. Run below that and the campaign is profitable on ads alone; run above it and you're spending margin (or investment budget) to buy sales, which can still be the right call for a launch, a ranking push, or defending a branded term — just not indefinitely, and not without knowing you're doing it. Enter your margin in the quick calculator above and it'll show your break-even ACOS directly.

How to download the Search Term or Campaign report

In Amazon Ads console, go to Measurement & Reporting → Reports, choose the Sponsored Products (or Sponsored Brands) report type, and select Search term or Campaign as the level. Pick a date range — 30 to 60 days gives enough clicks to trust the conversion numbers — and request the report as a CSV. Amazon generates it asynchronously, so give it a few minutes, then download the file and drop it into the analyzer above.

What columns the tool needs

Spend (or Cost), Clicks, and Impressions are required — without these the tool can't compute anything and will show an error naming exactly what's missing. Sales, Orders, and a name column (Search Term, Campaign Name, or Ad Group Name) are optional but strongly recommended: without a Sales column, ACOS and ROAS are shown as zero for lack of data; without Orders, conversion-based findings become more conservative. The tool recognizes common header variants automatically — "Cost," "Amount Spent," "7 Day Total Sales," "Customer Search Term" and similar labels are all matched to the right field, in English or Chinese.

How to read the four finding types

The analyzer scans every row and groups the results into four categories, ranked by how much money is on the table:

Choosing a target ACOS

Start from your break-even ACOS (roughly your margin before ad spend), then decide how much room you want above it. A new listing trying to earn its first reviews and ranking might deliberately target an ACOS above break-even for a few weeks; an established, profitable ASIN might target comfortably below break-even to bank profit. Whatever number you land on, the target ACOS you enter above only changes which rows get flagged as "above target" or "scale candidate" — it doesn't change the underlying spend, sales or ACOS numbers themselves, so it's safe to try a few values and see how the findings shift.