Just from youtube ads it's about $1 per 1000 views, but can vary by a factor of 4 in either direction. Sponsoring, Patreon subscriptions, etc adds between a lot and nothing on top of that, depending on the kind of videos, the fanbase and a host of other factors.

For example, PewDiePie makes a video a day with ~4 million views each, which should net him around $1.5 million a year from ad revenue. I have no problem imagining him making another $6.5M through other means, being the most well-known youtuber. He also does heavy promotion of amazon affiliate links, which probably brings in a decent amount of money as well.

But of course normal people don't make a video a day and don't get millions of views on each video. I think most youtubers who manage to make it their day job get the majority of their money through Patreon subscriptions.