Also known as search IS, search impression share is a metric measuring the percentage of impressions your ads receive compared to their potential impression volume. The formula is naturally quite basic to calculate: impressions you get over total eligible impressions. (For simplicity’s sake, eligible impressions are pretty much just the possible amount of impressions you could’ve got.)  Eligible impressions are determined by your targeting settings, approval status, and quality score. In today’s digital marketing since the retirement of the average position metric, impression share is now the metric used to […]