CPM

The metric comes from print and broadcast media buying, where audiences were sold in thousands. Digital advertising kept the unit, so a campaign quoting a fifteen dollar CPM is paying fifteen dollars for every thousand impressions its ads serve. In YouTube Studio this appears as playback based CPM, counted against monetised playbacks rather than total views.

For creators the number is useful as a market signal, not as income. CPM tells you what advertisers are willing to pay to reach your audience, which varies by niche, country, season, and video length. Finance, software, and insurance topics command far more than general entertainment, and rates rise in the fourth quarter and drop in January.

The common error is quoting CPM as earnings. Only a share of views carry ads at all, and the platform keeps a cut of what advertisers pay, so the amount reaching a creator is always lower. That figure is RPM, and mixing the two is why projected earnings so often overshoot reality by a wide margin.

Practically, CPM is worth tracking as a trend within one channel rather than compared against numbers other creators publish, since niche and audience country dominate the figure. Pairing it with RPM in a calculator gives a realistic earnings range, which matters before anyone plans a schedule or a hire around projected ad income.