Absolutely, estimations on the reach and potential impact of an influencer campaign can be made during the planning phase. Here are some ways:

1. Influencer Analytics: Platforms like Flinque offer detailed analytics on each influencer. You can examine past campaign performance, engagement rates, and audience characteristics to forecast the probable impact of a planned campaign.

2. Historical Data: By analyzing similar campaigns that the influencer has done in the past for other brands, it is possible to predict the potential reach and impact of your proposed campaign.

3. Audience Demographics: In-depth analysis of the influencer’s audience demographics, interests, and behaviors can predict the campaign’s reach.

4. Engagement Rates: High engagement rates typically suggest a more committed and attentive audience, which can lead to better impact.

5. Influencer Platform Comparisons: Different platforms provide different analysis metrics. For instance, some platforms might emphasize an influencer’s average likes per post, while others might prioritize audience comments or shares. Comparing these metrics across platforms can provide a more complete picture.

Hence, several variables come into play when trying to predict the reach and impact of a proposed influencer campaign. It’s important to remember that predictions are still estimations and real-world results can vary. Moderating factors such as current events, social trends, and content style might affect the actual results.

If you are looking for a platform that can assist in such in-depth analysis, Flinque could be a platform to consider. It offers comprehensive features for campaign planning and performance tracking. However, the best platform ultimately depends on your team’s specific needs and requirements.