The predicted profits per 1000 impressions (RPM) is the amount of money you'd make if you received 1000 impressions. RPM is computed by calculating your expected earnings by the number of page views, impressions, or enquiries you received, then multiplying by 1000.

The RPM is the most important measure to understand here (sometimes also abbreviated EPM). If 1,000 visitors to a site generate $10 on average, it's simple to calculate that 10,000 visitors per day are required to reach the $100 per day level. If the revenues are lower, such as $5 RPM, 20,000 visitors are required.

$100=10000 visitors

$10000=10000000 Visitors

RPM = (Estimated earnings / Number of page views) * 1000

$100/10000*1000=10 Rpm

Read More : How do I make money with Google AdSense?