Creators talk about "RPM" and advertisers talk about "CPM," and the gap between the two numbers confuses almost everyone new to YouTube monetization — for good reason, since they're measuring genuinely different things.
CPM: what advertisers pay
CPM (Cost Per Mille, "per thousand") is what an advertiser pays for one thousand ad impressions. This number reflects the advertising market, not your channel specifically — different content categories, seasons, and audience demographics all shift CPM.
RPM: what creators actually see
RPM (Revenue Per Mille) is your actual revenue per thousand views, after YouTube's platform share and after accounting for the fact that not every video view results in a monetized, paid ad impression (some views have no ads shown at all, for various reasons). RPM is always lower than the underlying CPM, often substantially, because it's diluted by unmonetized views and the platform's cut.
What actually moves your RPM
Your audience's geography significantly affects RPM, since advertiser demand and ad prices vary considerably by country. Content category matters too — some topics command reliably higher advertiser demand than others. Video length affects how many ad breaks are possible, which can change total ad revenue per view. Ad-blocker usage among your specific audience also reduces monetized impressions, lowering RPM independent of anything about your content itself.
Estimate your own numbers
A YouTube earnings calculator lets you project revenue from view count and an assumed RPM range — useful for rough planning, though your actual RPM will only be precisely known from your own YouTube Studio analytics once you're monetized.
The bottom line
CPM is the advertising market's price; RPM is what actually reaches you after dilution and the platform's share — the gap between them is normal, not a sign anything is being miscalculated.
Try it yourself
Put this into practice with our YouTube earnings calculator.