Hi, in one Phd. application they write in the requirements "good 2:1". Can you tell me in numbers what percentage this means? In my previous school, the only grading schema they have is "Distinction", "Merit", and "Pass". There is nothing I found in their website about 2:1 or anything like that.

In my university, "Distinction", "Merit", and "Pass" are the three grades you can get for an Masters degree.

A 2:1 would refer to an undergraduate degree. Again, in my university, it went like this:

1st (equivalent to a mark of 70% or above)
2:1 (between 60% and 69%)
2:2 (50%-59%)
3rd (40%-49%)

Under that was a fail. So by that system, a good 2:1 would be in the upper range of 60-69%.

Yes, as Acarpous says, it refers to undergraduate (Bachelors) qualifications. So you will need to translate your grades into the UK equivalent. I would interpret 'Good 2.1' to mean "65% or higher". Essentially they are trying to rule out people who got a 2.1 but were close to the 2.2. boarder.

I'm not english, so I was just wondering: where this final grade comes from? this is a sort of weighted average grade or what?

Because many unis ask to an italian student at least a 104 out of 110... which is EXTREMELY high, way beyond this 60-69%!

Just to be clear, 104 means you have a wighted average of 27 out of 30...this means 90% (with proportions) !

A "good 2:1" in the UK comes from your grades in 3rd and 4th year of your Undergraduate degree based on my experience.

...or second and third year, as many undergraduate degrees are three years. This is the exception at Oxbridge, where all years of the undergraduate degree contributes towards the final 'grade'.

You can't compare UK and Italian grades because 90% in Italy isn't the same as a 90% in the UK (common in one and probably impossible in the other).