While editing a report, in 'Measure' drop-down, you'll see the list of calculated metrics (metrics which are valid with chosen dimension.)
Below GIF shows the CTR (Clicks/Impressions) in AdWords report. 

Follow the steps below to create a report using calculated metrics.

Step 1: Go to Reports

Step 2: Create a report or edit an existing report

Step 3: Drag and drop a widget on to the report

Step 4: Click on + Add Metric button to create a new metric 

Step 5: Find the created metric in Measure drop-down, under Calculated Metrics group

Step 6: Send this report to your clients😃

Have questions about getting started with Calculated Metrics? Feel free to reach out to us at [email protected]

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  4. Common use cases for the 'Calculated Metrics'

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