To address the question of what is a good click through rate, you must first establish how to calculate click through rate.
Conversion rate experts follow this formula on how to calculate click through rate:
[Total Clicks / Total Impressions] x 100 = Click Through Rate
For example, if your paid ads earned 150,000 impressions and 3,500 of those people clicked the ad to visit your website, your CTR is 2.3%.
[3,500/150,000] x 100 = 2.3%