Calculating Rate by Month/Overall (example data inside)

plate201 first and foremost you need calendar table in your model and you can create one following my blog post Create a basic Date table in your data model for Time Intelligence calculations | PeryTUS IT Solutions

In Transform data, change your ColumnA to date and apply the changes. set relationship between calendar table and your table on the date column.

Add a following measure to get converted %

Count Rows = COUNTROWS ( yourTable )

% Converted = 
DIVIDE ( 
CALCULATE ( [Count Rows], YourTable[ColumnC] = "Converted" ),
CALCULATE ( [Count Rows], ALLSELECTED ( YourTable[ColumnB] )
)

To visualize, you can use any visual, let's say it is a line chart, on the x-axis using the Month column from the Calendar table and % Converted measure on value and it will get the converted trend.

Start with this and then can move to others which should be pretty straightforward

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