The most common question when moving to HSK 3.0: "What is my old HSK 4 worth now?" Straight answer: there is no official 1:1 score conversion — HSK 3.0 changed both the vocabulary scale and the band structure. But you can place yourself accurately by vocabulary size.
Why scores do not convert directly
An HSK score is tied to the exam of its standard. HSK 3.0 raises words per band and adds bands 7–9, so "180/300 on old HSK 4" and "180/300 on new HSK 4" do not measure the same volume of knowledge. Anyone selling an "exact conversion table" is overstating.