ROAS

in English: return on ad spend

basicwidespread

ROAS shows how many forints in revenue each forint spent on advertising generates.

In plain terms

ROAS is the simplest yardstick for advertising: you divide the revenue generated by the ads by the amount spent on them. If you spent HUF 100,000 and it brought in HUF 400,000 in revenue, the ROAS is 4, or 400 percent written another way.

It is like when a market vendor checks how much the flyer brought in: if they printed it for 10,000 forints and earned 50,000 forints in revenue, the flyer returned five times its cost. ROAS calculates exactly this, but per campaign, per ad, or even per keyword.

It is useful for comparing your ads: which one brings in a lot, and which one only spends money. However, it does not tell you if you are profitable, as it calculates revenue, not profit.

Today, the AI in advertising systems also uses this figure as a compass: you specify the return you expect, and the system adjusts who sees your ad, when, and at what price.

How it works

Your online store or website records with a measurement code if someone buys after clicking an ad, and how much they spent. Some systems also count purchases where the customer only saw the ad beforehand.
The advertising system assigns the purchase to the advertisement it believes triggered it. This is called attribution, and its rules vary by system.
The system adds up the revenue attributed to the ad and divides it by the ad spend: this is ROAS.
If you set a target ROAS, automated bidding estimates the expected purchase amount for each impression and bids more or less accordingly.
It is worth comparing the result with your own margin, because only then will it become clear whether the return on investment truly yields profit.

An everyday example

You sell handmade soaps online and spend HUF 50,000 a month on Facebook ads. The ad manager shows HUF 250,000 in revenue next to it, so the ROAS is 5. If your margin on the soaps is 30 percent, HUF 75,000 of the HUF 250,000 stays with you; the HUF 50,000 ad cost comes out of that, so behind the nice-looking number there is an actual profit of HUF 25,000.

Who is affected

marketerThis is one of the most important metrics used to measure, compare, and report campaign results to the client. → Marketing

entrepreneur, executiveFrom this, it sees whether the money spent on advertising will return and which channel deserves more or less spending.

developerWhether purchase measurement is accurate depends on their work, as faulty measurement leads to faulty ROAS and poor decisions. → Code

A common misconception

MythIf ROAS is high, the ad is definitely profitable.

In realityROAS measures revenue, not profit: it does not account for the cost of goods, shipping, returns, or labor. With low margins, even a 3 ROAS can be loss-making.

Limits and risks

Advertising systems attribute credit to themselves, so the same purchase can be counted by multiple platforms, making the aggregated number look better than reality.
It does not show whether the customer would have purchased the product without the advertisement; therefore, the return on investment for campaigns targeting repeat buyers can be deceptively high.
Due to cookie rejection and data protection restrictions, the system does not see some purchases but estimates them.
It looks only at the short term: ads that build awareness mostly have a weak ROAS, yet over the longer term they often bring in the new customers.

Similar, but not the same

Return on investment (ROI) – ROI compares profit to total investment, while ROAS compares revenue to advertising spend.
Customer Acquisition Cost (CAC) – CAC shows how much it costs to acquire a new customer, while ROAS indicates how many times the revenue returned compared to the money spent on advertising.
Click-through rate (CTR) – CTR only measures how many people clicked the ad, not whether it resulted in a purchase.

Related concepts

Broader

performance marketing, Marketinganalitika, Key performance indicator (KPI)

Narrower

target ROAS, Fedezeti ROAS, Total ROAS

On the edge

Return on investment (ROI), Conversion, Attribution, Customer Acquisition Cost (CAC), Automatic bidding

A brief history

The metric became widespread with the rise of online advertising, when clicks and purchases could first be directly linked. Automatic, ROI-optimized bidding by search advertising and social media platforms turned it into a common industry term.

Where things stand

At the end of 2026, ROAS is one of the basic metrics of online advertising. AI-driven campaigns on the major platforms often optimize for it or for conversion value, but many campaigns still target the number of purchases or the cost per purchase. More and more advertisers supplement it with profit-based metrics and experimental measurement, because ROAS alone can be misleading.

Status: 2026 November

Also known as

ROAS · return on ad spend · return on advertising spend · advertising return on investment · return on ad spend · return on ad spend · target ROAS · target ROAS

This entry was machine-edited and has undergone machine expert review; the “In the news” section updates automatically from Agent Age stories.