We can only estimate, we use a method that is based on the most successful sites in your niche. work out your conversion rate (out of 10 leads, how many do you convert to a sale) review traffic numbers from top ranking sites in your niche, then calculate how many leads they would get from the traffic they receive, its best to estimate low. You can base the % on your conversion rate You then have an idea of how many leads you will receive if you have a successful digital marketing campaign