Gather 2 numbers from Google Ads for, say, the past 30 days:

• Your total number of conversions. You can check this from your conversions columns in your reporting table.
• How much you spent on Google Ads. This is your monthly Google Ads budget.

Gather (or estimate) 2 numbers from your business:

• Your average revenue from conversions. How much you average per sale (or per new customer). You can set a value on each conversion to measure precisely the amount you earned.
• Your operating costs. How much you spend keeping your business running (not including advertising costs).

* Nguồn: Google