If you're a creator on YouTube or use AdSense, you've probably seen the terms RPM and CPM. They look similar but represent two very different numbers. CPM (Cost Per Mille) is what advertisers pay for 1,000 ad impressions. RPM (Revenue Per Mille) is what you actually earn per 1,000 views after YouTube takes its cut and only counting views that showed ads.
Understanding the difference is crucial for managing your earnings and setting realistic expectations. This guide explains both metrics with simple examples, shows you where to find them, and shares tips to improve your RPM.