WHAT ARE ROA’S AND WHERE DO THEY COME FROM?
Return on ad spends is a marketing metric that determines how much money is made for every dollar invested. ROAs assist internet firms in determining which tactics are effective and how to improve in the future.

AT A GLANCE, TARGET ROA’S
The average conversion value (revenue) for each dollar spent is the target ROA. It’s important to remember that the conversion value you get is influenced by the goal roa we specified. This Google Ads bidding technique assists you in generating more money while maintaining the desired return on ad spends. Target ROAS is an automatic bid method that lets you set a certain return on investment (ROI).
This Automated method allows Google to use automated computer tools to govern your bidding in order to meet a goal. All automated bid strategies are goal-oriented bidding systems, which means they are created to assist the advertiser in achieving his or her objectives.
You must either design a portfolio bid strategy or leverage an existing one to achieve your target return on ad spend bidding strategy. This bid strategy does not come in a conventional format. Portfolio bid techniques can be applied to many campaigns and aim to achieve targets across all of them.

CONVERSION VALUE MEANING
The amount of revenue generated by a conversion is referred to as conversion value. The amount of money your company makes from a particular conversion. We inform Google what our conversion value should be ahead of time, and we keep a conversion tracker to observe which terms convert and which don’t. To gain the most clicks on the most popular keyword, Google will apply the maximise click technique.

PORTFOLIO BID STRATEGIES
Portfolio bid strategies are goal-driven bid strategies that automate the optimization of bids across many campaigns. They automatically establish bids for each auction to help you meet your performance targets, and they give a one location where you can adjust bidding settings for all campaigns that utilise the same portfolio bid strategy.

HOW DOES IT WORK?
You’ll need to specify values for the conversions you’re tracking before you can use a Target ROAS bid strategy in your campaigns. Using your reported conversion values, Google Ads forecasts future conversions and associated values. Then, to maximise your conversion value, Google Ads will set maximum cost-per-click (max. CPC) bids while attempting to achieve an average return on ad spend (ROAS) equal to your target.
Although some conversions may have a larger ROAS than others, Google Ads will strive to keep your conversion value per cost similar to the target ROAS you set. If you select a target ROAS of 200 percent, Google Ads will change your bids automatically to try to optimise your conversion value while meeting your target ROAS.
After you’ve built up a new bid strategy and selected which campaigns to apply it to, Google Ads will suggest a target ROAS value.
This suggestion is based on your actual ROAS over the last few weeks. To accommodate for conversions that may take more than a day to complete after an ad click, we’ll omit performance from the previous several days. You have the option of using the recommended goal ROAS figure or setting your own.

FORMULA
Conversion value/cost = return on ad spending

EG:

If your aim is $5 and you spend or give $1 to Google, your goal is $5. (conversion value).

You’d aim for a 500 percent return on investment (ROI) – for every $1 you spend on advertising, you’d like to make $5 in revenue.

So,

Return on advertising expenditures = 5/1*100= 500%