If you are running paid advertising campaigns to boost leads or generate sales, then Conversion Rate is probably a metric you look into frequently. Conversion Rate is telling you how many people saw and clicked your ad against how many people converted. If 10 users clicked my ad, but 5 bought something from my website – my Conversion Rate is 50%. This is a great way to measure campaign efficiency, especially if you are trying to stay within a tight budget and keep your Cost per Conversion low.