So what’s the deal with this new conversion estimate feature? Google will utilize an account’s historical conversion data (if you don’t want to use historical data, you can enter your own conversion rates and values) and you can see how bid changes might impact metrics such as estimated conversion, conversion value, ROAS and Average CPA for mobile and desktop.
When using the feature, you’ll be able to see the conversion estimates broken out by ad group, keyword, device and location. You can do this by selecting the respective tabs above the chart area.
If you want to check conversion estimates out, you can choose the “Get traffic forecasts for a list of keywords” from the Keyword Planner home page.