https://socialblade.com/youtube/ https://socialblade.com/youtube/ Is a pretty good tool for this. I have some friends who are "professional YouTubers" (big e

https://socialblade.com/youtube/ https://socialblade.com/youtube/ Is a pretty good tool for this. I have some friends who are "professional YouTubers" (big enough to quit their day-jobs, not big enough to buy a Ferrari), who have told me they use that site for refernce. The estimate it gives has a pretty wide range, but it's typically in the middle of the two extremes. Just searched for one of my friends, and averaging the estimate gives just slightly more than what he's making in a month from YT. Of course, it's all really variable and depends on the size of your channel. In January he had a video go viral and made as much as he did in all of 2015, but has since gone back to his more regular numbers (growing a little every month).