Conversion Rate Calculation

Hi community.

I am new here and this is my first question here and I will be very grateful for your advice.

Given:

Table on leads

Dimesions:

• Creation Date of leads
• Source of leads
• City of leads
• Status of leads
• Id of leads (unique for each lead)

Measures:

• count(id)

I need to calculate a conversion (I expect a new calculated field) with a following definition  of

conversion rate = Total count of Ids with a status='customer' for given month/Total number of Ids for leads created for given month.

What would be the best way to solve this.

Many thanks in advance.