How to convert a grade in Italian scale to the UK grading scale?
there are resources online that do some approximate conversion like Scholaro. You will have to use your exam grades (look on your diploma supplement) for your GPA, not the final grade. I'm Italian too and used similar services myself when I was looking for Master's programs in the US. To access the selected program you then typically need a certified translation if the official language of the school differs from your degree, i.e., Italian diploma English school. Depending on the school, they might also require you to show a fourth year of university education, e.g. Master di primo livello, as US and UK programs often follow the 4-year format. But this is not a general rule, but it happened to me.
As a side-note, if you graduated from Marconi University in Rome, you can ask for a US-diploma free of charge at graduation, or 200Eur (I think) after that. Marconi is a special case as it has an International branch in Washington which is approved by the US department of education.
Hope it helps :)