CPM stands for Cost per thousand (Mille) impressions.
RPM stands for Revenue per thousand (Mille) impressions.
In other words, CPM is the price you’d pay each time your ad has been seen 1,000 times.
- ‘Mille’ means thousand in Latin
- The ‘M‘ in CPM is the Roman numeral for 1,000
For additional terminology and key performance indicators for measuring success, please see:
All About Media Buying – Part 2 – Traffic Monetization
For examples on calculating your ECPM (Earnings per thousand impressions), see: