The three rankings
Each is shown as a range (below average to above average) against ads chasing the same people: quality ranking (perceived quality), engagement rate ranking, and conversion rate ranking. They are diagnostic labels, not scores that directly set cost.
How to read them
The value is in which one is low. Low quality or engagement points at the creative; low conversion ranking points at the landing page or offer, not the ad. They are the Meta cousin of Google's Quality Score components, useful for locating the problem rather than as a number to chase.
Common questions
What are Meta's relevance diagnostics?
Three per-ad rankings, quality, engagement rate, and conversion rate, that compare an ad to others competing for the same audience, helping diagnose why it is under- or over-performing.
How do you use relevance diagnostics?
Look at which ranking is low: quality or engagement points to the creative, conversion rate points to the landing page or offer. Fix the specific weak link rather than the whole ad.