Click-through rate (CTR) is the percentage of people who click your link out of everyone who saw it. The math is simple: divide the number of clicks by the number of impressions, then multiply by 100. If your Google Ad was shown 1,000 times and 50 people clicked it, your CTR is 5%.
CTR shows up everywhere in digital marketing — paid search ads, organic search listings, email subject lines, and display banners all have a CTR. In every case it answers the same question: of the people who had the chance to click, how many did?
Say a plumber in Bangor runs a search ad for "emergency plumber Bangor." It appears 800 times in a week and gets 40 clicks. That is a 5% CTR — meaning 1 in every 20 people who saw the ad found it relevant enough to click through.
