When you create a new Classic ad set, the forecasted results pane automatically generates expected ad set performance details in real time as you walk through the ad set process and select various ad set settings.
To calculate the forecast, Campaign Manager analyzes your ad set settings, such as your objective, audience, ad format, bid, budget, and schedule, as well as your ad set historical performance. It then considers similar ad sets and advertisers to generate the projected estimates.
The forecasted results pane provides an estimate of:
Target audience size
The target audience size estimates the number of unique member accounts that fit your targeting criteria. As your Classic ad set serves ads, the number of member accounts that you reach will be lower than the target audience size.
Segment breakdown of target audience
Segment breakdown provides insights about your target audience, their interests, and where they work. These insights include Function, Seniority, Years of Experience, Company Size, Industries, and Interests. Segment breakdown automatically loads as you select a location and language and when you add at least one targeting segment or matched audience segment. The segment breakdown information is hidden by default. Click Show segments in the forecasted results pane to view the audience breakdown.
Projected spend
Projected spend is the projected amount spent for your Classic ad set. This number varies on your target ad set selections, for example, audience, schedule, budget, and more. Projected spend is available for 1-day, 7-day, and 30-day intervals.
Maximum potential spend
Maximum potential spend is the total spend that is hypothetically available with your bid and target audience, if you had unlimited daily budget and unlimited total budget. The maximum potential spend is hidden by default. To view the maximum potential spend in the forecasted results pane, click the icon and select the Show maximum potential spend checkbox.
Key result estimate related to your selected objective
The key result that your Classic ad set is optimized for is highlighted by a Key Result icon in the forecasted results pane. The key result for your ad set depends on your ad set objective, ad format, and bidding optimization goal.
Cost per key result estimate related to your selected objective
Cost per key result is the total spend of your Classic ad set divided by the number of results that are based on your objective. For example, cost per key result = spend / key results.