Here I tell you the example, if your website or blog ads impression within a day can reach 2000 impressions and people who end up by clicking your ads about 10 person, it can be calculated by divided the number of your clicking ads by the number of your entire blog impression then multiple it by a hundred. So we can get the CTR here is 0.5%.
The higher CTR you can get it is better for the revenue of your blog. The high CTR of your blog or website indicates that your viewers or visitors find that your ads are helpful and relevant for their needs. You can also use your CTR to evaluate and revise which one of the good keyword and which one of the keyword which need to be improved to get it relevant and relate between your content and your ads.