Assuming you make your first contact to new prospective candidates through email, your numbers should look something like what this calculator predicts. If you make your first contacts through linkedin, that’s fine. Just think “LinkedIn messenger” or “LinkedIn Connection Requests” instead of emails. The form says, “Cold Emails” because it might be easier to get statistics for open rates for emails than for InMails or Connection Requests.
Lastly, “Placements Per Month” assumes you work 50 weeks per year and take vacation 2 weeks each year or are unavailable for other reasons like car repairs, weddings, funerals, medical leave…things come up from time to time, right?