The Admob match rate is a metric that measures the percentage of ad impressions that are successfully served to users. It is calculated using the following formula:

Match rate = (Number of matched ad impressions / Number of ad impressions) x 100

For example, if an app serves 1000 ad impressions and 800 of them are successfully matched with an ad, the match rate would be calculated as follows:

Match rate = (800 / 1000) x 100 = 80%

A high match rate is typically seen as a positive sign, as it indicates that the app is able to serve a high percentage of ads to its users. A low match rate may be caused by a variety of factors, such as insufficient ad inventory or technical issues with the ad server. By monitoring the match rate and identifying any issues that may be impacting it, you can improve the effectiveness of your advertising and increase revenue from Admob.