How do you calculate a conversion rate?

Divide the number of people who viewed your conversion opportunity by the number of people on your marketing team.
Divide your total number of website visitors who had visited your site to date by the total number of people who converted on your net new form.
Divide the number of people who converted on your call-to-action, form, etc., by the total number of people who viewed it.
Divide your total number of website visitors by your total number of company employees.