What Is Reach ?
Reach is an estimate of how many people in a location could see your ads. How it's calculated: Your estimated reach may differ from census data, because reach calculates thenumber of signed-in users visiting Google sites. Reach also varies due to the length of activity, the number of temporary visitors to a location and the number of Google accounts used per person. How to use it: The reach estimate should only be used to compare location targets. To estimate the number of ad impressions, try the Keyword Planner How it's estimated Reach in AdWords is based on an estimate of the number of people seen on Google properties within the specified geographic area. Therefore, you may find that reach numbers in AdWords may differ significantly from census population data or other sources due to a range of factors, including: Number of accounts used per person Number of temporary visitors to a geographic location Length of time each person spends on a website Number of ...