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The forecaster tool provides advertisers with an estimated audience size and monthly bid reach based on the configured targeting options and bid for the campaign. This tool allows advertisers to see the estimated reach of their campaign and make the necessary edits to ensure they are reaching the largest audience possible.

The estimated reach is a monthly reach and is defined by the number of unique users who see the promoted content. It’s important to note that the estimated reach displayed is not affected by the overall budget configured for the campaign.

In the campaign creation process via ads.twitter.com, simply enter the specific targeting options you would like to target for your campaign. By entering targeting options such as follower, language and many others, you will start to see an estimated audience size display on the right side of your screen.

You can also use the forecaster tool feature with the Twitter Audience Platform as well. At this time, the feature is not yet supported for TV targeting, keyword targeting and Events targeting.

During the campaign creation process, you will see “N/A” being displayed due to the inclusion of keyword targeting, events targeting, TV targeting or multiple targeting credentials that are too granular for us to provide an exact audience size.