Sprout Social Influencer Marketing offers the ability to calculate Estimated Impressions for posts that cannot pull in actual Impressions. The benchmarks are completely customizable, with the default benchmarks being created using a large dataset of historical actual impression data.

These default Estimated Impression benchmarks are calculated using the percentages in the table below.

However, users can edit these benchmarks to fit their needs better here in Campaign Settings.
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To edit these values, hover over a cell. A pencil icon will appear, click on that to enable the ability to edit that cell's percentage.