Even though the CPM (cost per thousand contacts) is a common benchmark for evaluating influencer campaigns, you should by no means rely solely on it. In order to really evaluate performance, you need a set of additional key performance indicators (KPIs) that show you how well the content actually performs - both in terms of reach, interaction and conversion.
This metric measures how strongly an influencer's community reacts to a post - and is a key indicator of authenticity and relevance. The ER is calculated by comparing the sum of likes, comments, shares (and, if applicable, saved posts) to the reach or number of followers. A high engagement rate shows that the target group is active, attentive β and ready to interact with the brand. The following apply as a guideline:
- <1%: low engagement
- 1-3%: average
- β―3%: above average
These metrics show how often the content was played β and how many individual users were reached. While reach indicates how many people have seen a post, impressions record how often it was viewed overall - including multiple views. A high difference between the two values ββcan indicate a strong repetition effect, which can be particularly relevant for product placements.
If an influencer e.g.β―For example, if you share a link in the Instagram story or the YouTube description, the CTR shows how many users actually clicked on it. This metric is particularly crucial for performance goals such as website traffic, newsletter signups or shop visits. The higher the CTR, the more convincing the content was β both in terms of content and visually.
The conversion rate measures how many of the people who reach or click end up taking the desired action - e.g.β―B. buy a product or register for a service. This metric is the central success criterion for ROI-driven campaigns. What is important here is clean attribution, for example through UTM parameters, discount codes or individual affiliate links.
If the CPM doesn't tell you enough about the actual impact of the content, the CPE can be a good alternative. It shows how much you pay per like, comment or share β i.e. for actual interaction. This KPI can be more meaningful than pure reach metrics, especially for awareness or community goals.
In short: If you want to do data-driven influencer marketing, you shouldn't just look at pretty pictures and large reach. Only the combination of qualitative and quantitative KPIs provides a valid picture of campaign performance - and enables a well-founded evaluation and optimization of future collaborations.