What is a good ROAS on Amazon?
Amazon reports ACoS, the inverse of ROAS. A good number clears your break-even line, which your gross margin sets. Here is how the two connect.
By the GrowthCalc team · Updated June 2026
What a good ROAS looks like on Amazon
Return on ad spend (ROAS) is ad sales divided by ad spend. A 4.0x ROAS means you earned 4 in sales for every 1 you spent on Sponsored Products. On Amazon the verdict works exactly as it does anywhere else: a number is good only when it clears your break-even line, and that line is set by your gross margin, not by a benchmark you read somewhere. The general version of this answer, with the full margin-to-ROAS table, lives in our guide to what counts as a good ROAS. This page is about what is specific to Amazon.
The first Amazon-specific thing to know is that the Amazon Ads console does not lead with ROAS at all. It leads with ACoS. Most of the confusion sellers run into comes from holding a ROAS target in their head while the reports in front of them speak a different language. Once you can move between the two, the rest is the same margin math every channel obeys.
ACoS vs ROAS: the same campaign, two views
ACoS, or advertising cost of sale, is ad spend divided by ad sales, written as a percentage. ROAS is the inverse: ad sales divided by ad spend, written as a multiple. They describe one campaign from opposite ends, so a low ACoS and a high ROAS mean the same good news.
The relationship is exact, not a rough conversion. To turn ACoS into ROAS, divide 100 by the ACoS percentage:
ROAS = 100 ÷ ACoS% and ACoS% = 100 ÷ ROAS
So a 25% ACoS is a 4.0x ROAS, and a 4.0x ROAS is a 25% ACoS. A 50% ACoS is a 2.0x ROAS. The lower your ACoS, the higher your ROAS, because both halves of the fraction are simply flipped. Amazon defaults to ACoS because spend as a share of sales is the figure most sellers manage their bids against, but if your wider reporting or your agency works in ROAS, the conversion above keeps the two in step.
ACoS to ROAS conversion table
Read across to move between the figure Amazon shows you and the ROAS you are aiming for. Each row is the same campaign expressed both ways, using ROAS equals 100 divided by ACoS.
| ACoS | ROAS | What it means |
|---|---|---|
| 10% | 10.00x | Very efficient; profitable on almost any margin |
| 12.5% | 8.00x | An 800% ROAS; strong for nearly all sellers |
| 20% | 5.00x | Profitable above a 20% margin |
| 25% | 4.00x | Break-even at a 25% margin |
| 30% | 3.33x | Break-even at a 30% margin |
| 40% | 2.50x | Break-even at a 40% margin |
| 50% | 2.00x | Break-even at a 50% margin; tolerated in launch |
The "what it means" column already hints at the rule that decides good from bad on Amazon: the ACoS that breaks you even is your gross margin, and the matching ROAS is its inverse. That is the next section.
Your gross margin sets break-even, on Amazon as everywhere
Break-even on Amazon is margin-driven. Your break-even ACoS equals your gross margin percentage, and your break-even ROAS equals 1 divided by that margin. The two say the same thing: at break-even, the sales an ad brings in exactly cover the cost of the goods plus the ad spend, leaving zero profit.
Take a seller whose product carries a 30% gross margin after the cost of goods, Amazon referral and fulfilment fees. Break-even ACoS is 30%, which is a break-even ROAS of about 3.33x. Spend that pushes ACoS below 30% (ROAS above 3.33x) makes money; spend that lets ACoS drift above 30% (ROAS below 3.33x) loses it. A genuinely good ROAS for that seller is one with headroom above 3.33x, sized to the profit they want to keep.
This is why a borrowed target can mislead. A widely repeated convention is that a good ACoS sits somewhere in the teens to thirties, but that range only holds for products in that margin band, and it varies by category and fee structure. The honest answer is your own break-even line. Work out your gross margin with the gross margin calculator, including Amazon's fees in your cost of goods, then find the exact break-even point with the break-even calculator. Compare your live ACoS or ROAS against that, and the verdict stops being a guess.
Where TACoS fits alongside ACoS
TACoS, or total advertising cost of sale, is ad spend divided by total sales, including organic sales, where ACoS divides ad spend by ad-attributed sales only. ACoS judges the efficiency of the ads in isolation; TACoS judges what your ad spend is doing for the whole business.
Amazon sellers watch both because they answer different questions. A campaign can hold a steady ACoS while TACoS falls over time, which usually means ads are lifting your organic rank, so a growing share of sales now comes for free and each advertising dollar is carrying more total revenue. A rising TACoS at a flat ACoS is the warning sign: you are buying more of your own sales rather than growing organic demand. TACoS does not have a clean ROAS inverse the way ACoS does, because its denominator is total sales, not ad sales, so treat it as a trend to watch rather than a figure to convert.
Launch targets vs profit targets
A good ROAS on Amazon changes with the job the campaign is doing. During a launch many sellers accept a higher ACoS, and so a lower ROAS, on purpose: the spend buys rank, reviews and the early sales velocity that Amazon's organic placement rewards. Running below break-even for a defined launch window is a deliberate investment in position, not a failing campaign.
A mature, profit-focused campaign flips the priority. Once a product holds its rank, the aim shifts to a lower ACoS and a higher ROAS, harvesting demand efficiently rather than buying growth. The same product might tolerate a 50% ACoS (a 2.0x ROAS) at launch and target a 20% ACoS (a 5.0x ROAS) once it is established. This launch-then-harvest pattern is a common Amazon convention rather than a rule, so set the window and the target against your own margin and goals, then read every campaign back through your break-even line with the ROAS calculator.
Frequently asked questions
What is a good ROAS on Amazon?
A good ROAS on Amazon is one that sits comfortably above your break-even ROAS, which equals 1 divided by your gross margin. A seller with a 30% margin breaks even near 3.33x ROAS, so anything well above that is profitable. Amazon reports the same idea as ACoS rather than ROAS, and the two are exact inverses: ROAS equals 100 divided by your ACoS percentage. The right target depends on your margin and on your goal, with launch campaigns tolerating a lower ROAS than profit-focused ones, not on a single benchmark number.
Is a 2.5 ROAS good on Amazon?
A 2.5x ROAS on Amazon means you earn 2.50 in sales for every 1 you spend on ads, which is the same as a 40% ACoS. Whether it is good depends on your gross margin. At a 40% margin you break even at 2.5x, so 2.5x covers costs but makes no profit. Above a 40% margin it is profitable; below it, the campaign is losing money on every sale.
Is 800% ROAS good on Amazon?
An 800% ROAS is the same as 8.0x, or a 12.5% ACoS: you earn 8 in sales for every 1 of ad spend. That is strong for almost any Amazon margin, since break-even ROAS rarely climbs above 5x. A figure this high can also signal that you are underspending, so it is worth testing whether more budget keeps you above break-even and wins more rank.
Is a 9 ROAS good on Amazon?
A 9.0x ROAS, or roughly an 11% ACoS, is a high-efficiency result on Amazon and is profitable for nearly any margin. A ROAS that high usually means your targeting is tight and your conversion rate is strong. It can also mean there is unmet demand you are not bidding on, so a mature campaign at 9x is often worth scaling rather than left alone.
How do I convert ACoS to ROAS?
Divide 100 by your ACoS percentage to get ROAS as a multiple. A 25% ACoS is 100 divided by 25, which is 4.0x ROAS. To go the other way, divide 100 by your ROAS to get ACoS: a 4.0x ROAS is 100 divided by 4, which is a 25% ACoS. They are two views of the same campaign, so neither is more correct.