Why my earnings are 1/75 th of my ecpm. How can I improve my earnings? I have 18 sites. But, my earnings are mainly from 4-5 sites. I can't understand why my ecpm is so high, but my earnings are so low? My earnings are mainly from medical ones.(cancer and diabetes). Due to google TOS, i am not giving my statistics. Please help me in this regard.
It depends on ad location, type of ads and theme of the sites and lot of other factor. So all you channels (sites) give same, if there is different that might give you some idea.
eCPM is the amount per thousand impressions. So for example your site might have a $100 eCPM but only had 100 impressions and earned $10 . eCPM however is calculated per thousand impressions so theoretically you could achieve $100 dollars once you have made your 1000 impressions, hope that's clear.
Medical themes usually make good money. Just try and promote your site in relevant forums and get links to it - increasing visitors will increase your income.
The answer to your question: Get 75 times more visitors, and you will have the same amount as your eCPM.