You can see that in social blade site
UCvUVsODRvjdr-zDaLGWEnLg YouTube Stats, Channel Statistics
You can search for the channel you want to ask.
But it can be a big variation depending on the audience, the country, the language. For example, I know channels with 1.000.000 subscribers and with 200.000 subscribers where both earn 2000 u$s per month. Because one of them talk about SEO (then hosting ads sell a lot) and the other is about entertainment for teenagers that don’t spend so much.