What this table actually shows
Pearson's July 2025 concordance study compares score distributions between the enhanced PTE Academic and IELTS Academic. It reports a PTE range for each IELTS Academic half-band from 4.5 to 9.0, separately for the overall score and for Listening, Reading, Speaking and Writing.
This is a concordance, not a conversion formula. It describes how two groups of test takers scored on both tests, so a PTE score inside a given range is associated with, not certified as equal to, the matching IELTS band.