Clickthrough rate is “A ratio showing how often people who see your ad end up clicking it. ” (Google)
To calculate CTR we use a simple formula:
Clicks ÷ Impressions = CTR
CTR can be used to determine whether people are finding your ads relevant and useful – a high CTR is a good indication of a useful and relevant ad.
CTR can be used to evaluate the success of your ads and keywords and is indicative of which ads need to be improved.