Measuring the return on investment (ROI) in influencer marketing can be somewhat complex because it involves a combination of quantitative and qualitative metrics. However, here’s a broad outline of how you might proceed:

1. Set clear objectives: Before launching a campaign, set clear objectives. Are you trying to increase brand awareness, generate leads, gain social followers, or drive sales? The objective will dictate which metrics to track.

2. Trackable links and Promo codes: Use trackable links and unique promo codes for each influencer’s content to directly measure clicks, conversions, and sales.

3. Engagement Metrics: Evaluate the number of likes, comments, shares, and views on the influencer’s content.

4. Audience growth: Track changes in your followers/subscribers before and after the campaign.

5. Audience Sentiment: Engage in social listening to understand the sentiment around your brand and your campaign.

6. Calculate ROI: Finally, to calculate your ROI, subtract the cost of investment (i.e., what you pay the influencer and any other campaign costs) from the revenue generated, then divide by the cost of investment again: (Revenue-Cost)/Cost.

Most Influencer Marketing Platforms provide analytics for these metrics, which can streamline the process significantly. For instance, platforms like Flinque offer end-to-end campaign tracking, which simplifies ROI measurement by integrating metrics tracking within the campaign workflow.

While different teams might prefer different platforms based on their specific needs, it is essential to choose a solution that provides comprehensive performance tracking, as this is crucial for accurate ROI calculation.