I know this was just written as content marketing, but a more accurate insight wouldn't involve the conversion to uniques at all. On one side you'd have count of unique IPs from the access logs at your web server. And on the other side you'd have count of unique IPs seen by the tracking tools you use.

And even then you wouldn't be able to map this quotient to human behavior. But you would have an upper bound on how inaccurate your analytics tools are.