The first and most important thing is to understand what Reach is.
Reach is defined by unique users who saw your content, but let's be more precise:
Page Reach = The number of unique people who had any content from your Page or about your Page enter their screen. This includes posts, stories, check-ins, ads, social information from people interacting with your Page, and more – during a specific period.
Post Reach = The number of unique people who saw a specific post on their timeline.
Facebook provides reach numbers for only three periods – Daily, Weekly, and Last28 Page Reach.
Daily Page Reach:
This metric represents the total number of unique users who have seen any content from your Facebook Page on a particular day.
It includes users who see your posts, stories, and other content within 24 hours.
Weekly Page Reach:
Like daily reach, weekly page reach provides the total number of unique users who have viewed your Page's content over seven days.
It gives you a broader view of your audience engagement over a week.
Last 28 Days Page Reach:
This metric covers the total number of unique users who have seen your Page's content in the past 28 days.
It provides a more extended overview, allowing you to analyze the reach performance of your Page over a month.
You can see the Last 28 Page Reach (applies for other ones as well) by placing the cursor on a specific date inside the graph:
The Last28 Page Reach between October 17 and November 13 is 106,704 unique users.
This implies that summing up the data for each day or week is possible. Facebook automatically provides data for Daily, Weekly, and Last 28 Reach because the data represents unique users who saw your content within each period.
Reach for 30- 31 Days?
At times, users may seek to reach data for a distinct period, like the entire month of 30 or 31 days. However, adding daily numbers from the graph can lead to misleading results. A common mistake is counting each day individually, resulting in inflated figures.
→ The core issue lies in the fact that a single unique user, say John, who visited your page daily for the last month, would be counted not just once but 31 times.
→ To circumvent this error, it's crucial to recognize that there is no cumulative reach.
→ To obtain accurate data, use your cursor within the graph to view information for the preceding period.
Understanding these metrics is crucial for evaluating the effectiveness of your content strategy, identifying trends, and gauging the overall performance of your Facebook Page. A higher reach generally indicates that more people are seeing your content, while a lower reach might prompt a review of your content strategy or the need for promotion.
Please note that Facebook's features and metrics can be subject to changes, and it's advisable to check Facebook's official documentation or Page Insights for the latest information and updates on metrics.