yes CTR is calculated by Number of Impression and Number of Clicks . If u have high CTR it means you get many clicks .
CTR is the average number of click-throughs per hundred ad impressions, expressed as a percentage. You can acquire it with this formula: CTR = (Clicks/Impression) x 100 You can also use this simple CTR calculator: http://www.csgnetwork.com/ctrcalc.html
Clickthrough rate or CTR is a way of measuring the success of an online advertising campaign. A CTR is obtained by dividing the "number of users who clicked on an ad" on a web page by the "number of times the ad was delivered" (impressions). For example, if a banner ad was delivered 100 times (impressions delivered) and one person clicked on it (clicks recorded), then the resulting CTR would be 1 percent.